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[taler-anastasis] branch master updated: integrate documentation


From: gnunet
Subject: [taler-anastasis] branch master updated: integrate documentation
Date: Sun, 18 Jul 2021 08:41:20 +0200

This is an automated email from the git hooks/post-receive script.

grothoff pushed a commit to branch master
in repository anastasis.

The following commit(s) were added to refs/heads/master by this push:
     new 6f20879  integrate documentation
6f20879 is described below

commit 6f20879960fdee753a802ff4abb752b95e211f84
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Sun Jul 18 08:41:16 2021 +0200

    integrate documentation
---
 README                                             |    6 +-
 doc/Makefile.am                                    |    7 +-
 doc/anastasis-config.1                             |  123 +
 doc/anastasis-figures/anastasis_reducer_backup.png |  Bin 47081 -> 59981 bytes
 .../anastasis_reducer_recovery.png                 |  Bin 48943 -> 52610 bytes
 doc/anastasis-httpd.1                              |   99 +-
 doc/anastasis-reducer.1                            |   93 +
 doc/anastasis.conf.5                               |  151 +
 doc/anastasis.texi                                 | 7416 ++++++++++++++------
 doc/sphinx/Makefile                                |  179 +
 doc/sphinx/README                                  |   10 +
 .../__pycache__/typescriptdomain.cpython-39.pyc    |  Bin 0 -> 15399 bytes
 doc/sphinx/_exts/httpdomain/__init__.py            |   14 +
 .../httpdomain/__pycache__/__init__.cpython-37.pyc |  Bin 0 -> 514 bytes
 .../httpdomain/__pycache__/__init__.cpython-38.pyc |  Bin 0 -> 518 bytes
 .../httpdomain/__pycache__/__init__.cpython-39.pyc |  Bin 0 -> 520 bytes
 .../__pycache__/httpdomain.cpython-37.pyc          |  Bin 0 -> 24431 bytes
 .../__pycache__/httpdomain.cpython-38.pyc          |  Bin 0 -> 24436 bytes
 .../__pycache__/httpdomain.cpython-39.pyc          |  Bin 0 -> 24344 bytes
 doc/sphinx/_exts/httpdomain/autohttp/__init__.py   |   11 +
 doc/sphinx/_exts/httpdomain/autohttp/bottle.py     |  114 +
 doc/sphinx/_exts/httpdomain/autohttp/common.py     |   36 +
 doc/sphinx/_exts/httpdomain/autohttp/flask.py      |   48 +
 doc/sphinx/_exts/httpdomain/autohttp/flask_base.py |  215 +
 doc/sphinx/_exts/httpdomain/autohttp/flaskqref.py  |   80 +
 doc/sphinx/_exts/httpdomain/autohttp/tornado.py    |  128 +
 doc/sphinx/_exts/httpdomain/httpdomain.py          |  772 ++
 doc/sphinx/_exts/taler_sphinx_theme/__init__.py    |  166 +
 .../__pycache__/__init__.cpython-37.pyc            |  Bin 0 -> 6508 bytes
 .../__pycache__/__init__.cpython-38.pyc            |  Bin 0 -> 6560 bytes
 .../__pycache__/__init__.cpython-39.pyc            |  Bin 0 -> 6548 bytes
 .../guzzle_sphinx_theme/comments.html              |   16 +
 .../guzzle_sphinx_theme/globaltoc.html             |   14 +
 .../guzzle_sphinx_theme/layout.html                |  172 +
 .../guzzle_sphinx_theme/localtoc.html              |   10 +
 .../guzzle_sphinx_theme/logo-text.html             |    1 +
 .../guzzle_sphinx_theme/search.html                |   48 +
 .../guzzle_sphinx_theme/searchbox.html             |   15 +
 .../static/css/bootstrap-theme.min.css             |    7 +
 .../static/css/bootstrap.min.css                   |    7 +
 .../static/fonts/glyphicons-halflings-regular.eot  |  Bin 0 -> 20290 bytes
 .../static/fonts/glyphicons-halflings-regular.svg  |  229 +
 .../static/fonts/glyphicons-halflings-regular.ttf  |  Bin 0 -> 41236 bytes
 .../static/fonts/glyphicons-halflings-regular.woff |  Bin 0 -> 23292 bytes
 .../open-sans/fonts/OpenSans-Bold-webfont.eot      |  Bin 0 -> 30858 bytes
 .../open-sans/fonts/OpenSans-Bold-webfont.svg      |  251 +
 .../open-sans/fonts/OpenSans-Bold-webfont.ttf      |  Bin 0 -> 30680 bytes
 .../open-sans/fonts/OpenSans-Bold-webfont.woff     |  Bin 0 -> 19788 bytes
 .../fonts/OpenSans-BoldItalic-webfont.eot          |  Bin 0 -> 34166 bytes
 .../fonts/OpenSans-BoldItalic-webfont.svg          |  251 +
 .../fonts/OpenSans-BoldItalic-webfont.ttf          |  Bin 0 -> 33960 bytes
 .../fonts/OpenSans-BoldItalic-webfont.woff         |  Bin 0 -> 21940 bytes
 .../open-sans/fonts/OpenSans-ExtraBold-webfont.eot |  Bin 0 -> 30602 bytes
 .../open-sans/fonts/OpenSans-ExtraBold-webfont.svg |  251 +
 .../open-sans/fonts/OpenSans-ExtraBold-webfont.ttf |  Bin 0 -> 30404 bytes
 .../fonts/OpenSans-ExtraBold-webfont.woff          |  Bin 0 -> 19972 bytes
 .../fonts/OpenSans-ExtraBoldItalic-webfont.eot     |  Bin 0 -> 33758 bytes
 .../fonts/OpenSans-ExtraBoldItalic-webfont.svg     |  251 +
 .../fonts/OpenSans-ExtraBoldItalic-webfont.ttf     |  Bin 0 -> 33532 bytes
 .../fonts/OpenSans-ExtraBoldItalic-webfont.woff    |  Bin 0 -> 21824 bytes
 .../open-sans/fonts/OpenSans-Italic-webfont.eot    |  Bin 0 -> 34798 bytes
 .../open-sans/fonts/OpenSans-Italic-webfont.svg    |  251 +
 .../open-sans/fonts/OpenSans-Italic-webfont.ttf    |  Bin 0 -> 34612 bytes
 .../open-sans/fonts/OpenSans-Italic-webfont.woff   |  Bin 0 -> 22416 bytes
 .../open-sans/fonts/OpenSans-Light-webfont.eot     |  Bin 0 -> 29794 bytes
 .../open-sans/fonts/OpenSans-Light-webfont.svg     |  252 +
 .../open-sans/fonts/OpenSans-Light-webfont.ttf     |  Bin 0 -> 29612 bytes
 .../open-sans/fonts/OpenSans-Light-webfont.woff    |  Bin 0 -> 19396 bytes
 .../fonts/OpenSans-LightItalic-webfont.eot         |  Bin 0 -> 34578 bytes
 .../fonts/OpenSans-LightItalic-webfont.svg         |  252 +
 .../fonts/OpenSans-LightItalic-webfont.ttf         |  Bin 0 -> 34368 bytes
 .../fonts/OpenSans-LightItalic-webfont.woff        |  Bin 0 -> 22444 bytes
 .../open-sans/fonts/OpenSans-Regular-webfont.eot   |  Bin 0 -> 29934 bytes
 .../open-sans/fonts/OpenSans-Regular-webfont.svg   |  252 +
 .../open-sans/fonts/OpenSans-Regular-webfont.ttf   |  Bin 0 -> 29744 bytes
 .../open-sans/fonts/OpenSans-Regular-webfont.woff  |  Bin 0 -> 19624 bytes
 .../open-sans/fonts/OpenSans-Semibold-webfont.eot  |  Bin 0 -> 30350 bytes
 .../open-sans/fonts/OpenSans-Semibold-webfont.svg  |  251 +
 .../open-sans/fonts/OpenSans-Semibold-webfont.ttf  |  Bin 0 -> 30156 bytes
 .../open-sans/fonts/OpenSans-Semibold-webfont.woff |  Bin 0 -> 19736 bytes
 .../fonts/OpenSans-SemiboldItalic-webfont.eot      |  Bin 0 -> 34866 bytes
 .../fonts/OpenSans-SemiboldItalic-webfont.svg      |  251 +
 .../fonts/OpenSans-SemiboldItalic-webfont.ttf      |  Bin 0 -> 34644 bytes
 .../fonts/OpenSans-SemiboldItalic-webfont.woff     |  Bin 0 -> 22332 bytes
 .../static/fonts/open-sans/stylesheet.css          |  136 +
 .../source-serif-pro/EOT/SourceSerifPro-Black.eot  |  Bin 0 -> 111902 bytes
 .../source-serif-pro/EOT/SourceSerifPro-Bold.eot   |  Bin 0 -> 113630 bytes
 .../EOT/SourceSerifPro-ExtraLight.eot              |  Bin 0 -> 112362 bytes
 .../source-serif-pro/EOT/SourceSerifPro-Light.eot  |  Bin 0 -> 112866 bytes
 .../EOT/SourceSerifPro-Regular.eot                 |  Bin 0 -> 112354 bytes
 .../EOT/SourceSerifPro-Semibold.eot                |  Bin 0 -> 113510 bytes
 .../static/fonts/source-serif-pro/LICENSE.txt      |   93 +
 .../source-serif-pro/OTF/SourceSerifPro-Black.otf  |  Bin 0 -> 91216 bytes
 .../source-serif-pro/OTF/SourceSerifPro-Bold.otf   |  Bin 0 -> 92760 bytes
 .../OTF/SourceSerifPro-ExtraLight.otf              |  Bin 0 -> 89720 bytes
 .../source-serif-pro/OTF/SourceSerifPro-Light.otf  |  Bin 0 -> 91424 bytes
 .../OTF/SourceSerifPro-Regular.otf                 |  Bin 0 -> 91276 bytes
 .../OTF/SourceSerifPro-Semibold.otf                |  Bin 0 -> 93144 bytes
 .../static/fonts/source-serif-pro/README.md        |   18 +
 .../static/fonts/source-serif-pro/ReadMe.html      |   72 +
 .../source-serif-pro/SourceSerifProReadMe.html     |  189 +
 .../source-serif-pro/TTF/SourceSerifPro-Black.ttf  |  Bin 0 -> 111572 bytes
 .../source-serif-pro/TTF/SourceSerifPro-Bold.ttf   |  Bin 0 -> 113320 bytes
 .../TTF/SourceSerifPro-ExtraLight.ttf              |  Bin 0 -> 112004 bytes
 .../source-serif-pro/TTF/SourceSerifPro-Light.ttf  |  Bin 0 -> 112528 bytes
 .../TTF/SourceSerifPro-Regular.ttf                 |  Bin 0 -> 112048 bytes
 .../TTF/SourceSerifPro-Semibold.ttf                |  Bin 0 -> 113168 bytes
 .../WOFF/OTF/SourceSerifPro-Black.otf.woff         |  Bin 0 -> 48788 bytes
 .../WOFF/OTF/SourceSerifPro-Bold.otf.woff          |  Bin 0 -> 51188 bytes
 .../WOFF/OTF/SourceSerifPro-ExtraLight.otf.woff    |  Bin 0 -> 47136 bytes
 .../WOFF/OTF/SourceSerifPro-Light.otf.woff         |  Bin 0 -> 49672 bytes
 .../WOFF/OTF/SourceSerifPro-Regular.otf.woff       |  Bin 0 -> 48972 bytes
 .../WOFF/OTF/SourceSerifPro-Semibold.otf.woff      |  Bin 0 -> 51272 bytes
 .../WOFF/TTF/SourceSerifPro-Black.ttf.woff         |  Bin 0 -> 49496 bytes
 .../WOFF/TTF/SourceSerifPro-Bold.ttf.woff          |  Bin 0 -> 51924 bytes
 .../WOFF/TTF/SourceSerifPro-ExtraLight.ttf.woff    |  Bin 0 -> 48784 bytes
 .../WOFF/TTF/SourceSerifPro-Light.ttf.woff         |  Bin 0 -> 50792 bytes
 .../WOFF/TTF/SourceSerifPro-Regular.ttf.woff       |  Bin 0 -> 49604 bytes
 .../WOFF/TTF/SourceSerifPro-Semibold.ttf.woff      |  Bin 0 -> 51772 bytes
 .../static/fonts/source-serif-pro/bower.json       |   15 +
 .../fonts/source-serif-pro/source-serif-pro.css    |   65 +
 .../guzzle_sphinx_theme/static/guzzle.css_t        | 1037 +++
 .../guzzle_sphinx_theme/static/jquery.js           |    5 +
 .../guzzle_sphinx_theme/static/jquery.min.map      |    1 +
 .../guzzle_sphinx_theme/static/js/bootstrap.js     | 1951 +++++
 .../guzzle_sphinx_theme/static/js/bootstrap.min.js |    6 +
 .../guzzle_sphinx_theme/theme.conf                 |   40 +
 doc/sphinx/_exts/typescriptdomain.py               |  587 ++
 doc/sphinx/_static/.gitignore                      |    0
 doc/sphinx/anastasis-db.png                        |  Bin 0 -> 38801 bytes
 doc/sphinx/anastasis_challenge_payment.png         |  Bin 0 -> 20331 bytes
 doc/sphinx/anastasis_challengecode.png             |  Bin 0 -> 17678 bytes
 doc/sphinx/anastasis_reducer_backup.drawio         |    1 +
 doc/sphinx/anastasis_reducer_backup.png            |  Bin 0 -> 59981 bytes
 doc/sphinx/anastasis_reducer_backup.svg            |    3 +
 doc/sphinx/anastasis_reducer_recovery.drawio       |    1 +
 doc/sphinx/anastasis_reducer_recovery.png          |  Bin 0 -> 52610 bytes
 doc/sphinx/anastasis_reducer_recovery.svg          |    3 +
 doc/sphinx/anastasis_truth.png                     |  Bin 0 -> 19493 bytes
 doc/sphinx/anastasis_truth_payment.png             |  Bin 0 -> 13430 bytes
 doc/sphinx/authentication.rst                      |  110 +
 doc/sphinx/conf.py                                 |  304 +
 doc/sphinx/configuration.rst                       |   30 +
 doc/sphinx/core/api-common.rst                     |  360 +
 doc/sphinx/cryptography.rst                        |  298 +
 doc/sphinx/db.rst                                  |   28 +
 doc/sphinx/design-documents/001-anastasis-ux.rst   |  318 +
 doc/sphinx/design-documents/999-template.rst       |   25 +
 doc/sphinx/design-documents/index.rst              |   13 +
 doc/sphinx/fdl-1.3.rst                             |  453 ++
 doc/sphinx/frags/README.md                         |   18 +
 doc/sphinx/frags/configuration-format.rst          |   69 +
 doc/sphinx/frags/installing-anastasis-gtk.rst      |   31 +
 doc/sphinx/frags/installing-anastasis.rst          |   30 +
 doc/sphinx/frags/installing-debian.rst             |   59 +
 doc/sphinx/frags/installing-gnunet-gtk.rst         |   28 +
 doc/sphinx/frags/installing-gnunet.rst             |   21 +
 doc/sphinx/frags/installing-taler-exchange.rst     |   16 +
 doc/sphinx/frags/installing-taler-merchant.rst     |   34 +
 doc/sphinx/frags/installing-ubuntu.rst             |   27 +
 doc/sphinx/frags/list-of-dependencies.rst          |   21 +
 doc/sphinx/frags/using-anastasis-config.rst        |   50 +
 doc/sphinx/genindex.rst                            |    2 +
 doc/sphinx/global-licensing.rst                    |   64 +
 doc/sphinx/index.rst                               |   47 +
 doc/sphinx/installation.rst                        |  175 +
 doc/sphinx/introduction.rst                        |   70 +
 doc/sphinx/manindex.rst                            |    9 +
 doc/sphinx/manpages/anastasis-config.1.rst         |  101 +
 doc/sphinx/manpages/anastasis-gtk.1.rst            |   54 +
 doc/sphinx/manpages/anastasis-httpd.1.rst          |   58 +
 doc/sphinx/manpages/anastasis-reducer.1.rst        |   71 +
 doc/sphinx/manpages/anastasis.conf.5.rst           |  133 +
 doc/sphinx/reducer.rst                             | 1646 +++++
 doc/sphinx/rest.rst                                |  508 ++
 src/cli/anastasis-cli-redux.c                      |    2 +-
 src/reducer/anastasis_api_backup_redux.c           |   13 +-
 src/util/os_installation.c                         |    6 +-
 178 files changed, 20102 insertions(+), 2123 deletions(-)

diff --git a/README b/README
index 35f82b4..e038984 100644
--- a/README
+++ b/README
@@ -2,9 +2,9 @@
 ANASTASIS
 =========
 
-This package includes the Anastasis core logic.  The code is
-released under the GNU General Public License (v3 or later).
-See COPYING for details.
+This package includes the Anastasis core logic.  The code is released
+under the GNU Affero General Public License (v3 or later).  See
+COPYING for details.
 
 Description
 ===========
diff --git a/doc/Makefile.am b/doc/Makefile.am
index bf64cd4..90f6797 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -3,12 +3,17 @@
 SUBDIRS = . doxygen
 
 man_MANS = \
-  anastasis-httpd.1
+  anastasis-httpd.1 \
+  anastasis-reducer.1 \
+  anastasis.conf.5 \
+  anastasis-config.1
 
 info_TEXINFOS = \
   anastasis.texi
 
 EXTRA_DIST = \
+ $(info_TEXINFOS) \
+ $(man_MANS) \
  anastasis-figures/anastasis-db.png \
  anastasis-figures/anastasis_reducer_backup.png \
  anastasis-figures/anastasis_truth_payment.png \
diff --git a/doc/anastasis-config.1 b/doc/anastasis-config.1
new file mode 100644
index 0000000..bb1512d
--- /dev/null
+++ b/doc/anastasis-config.1
@@ -0,0 +1,123 @@
+.\" Man page generated from reStructuredText.
+.
+.TH "ANASTASIS-CONFIG" "1" "Jul 18, 2021" "0.0" "Anastasis"
+.SH NAME
+anastasis-config \- anastasis configuration file manipulation
+.
+.nr rst2man-indent-level 0
+.
+.de1 rstReportMargin
+\\$1 \\n[an-margin]
+level \\n[rst2man-indent-level]
+level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
+-
+\\n[rst2man-indent0]
+\\n[rst2man-indent1]
+\\n[rst2man-indent2]
+..
+.de1 INDENT
+.\" .rstReportMargin pre:
+. RS \\$1
+. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
+. nr rst2man-indent-level +1
+.\" .rstReportMargin post:
+..
+.de UNINDENT
+. RE
+.\" indent \\n[an-margin]
+.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.nr rst2man-indent-level -1
+.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
+..
+.SH SYNOPSIS
+.sp
+\fBanastasis\-config\fP
+[\fB\-b\fP\ \fIbackend\fP\ |\ \fB––supported\-backend=\fP\fIbackend\fP]
+[\fB\-c\fP\ \fIfilename\fP\ |\ \fB––config=\fP\fIfilename\fP]
+[\fB\-f\fP\ |\ \fB––filename\fP]
+[\fB\-F\fP\ |\ \fB––full\fP]
+[\fB\-h\fP\ |\ \fB––help\fP]
+[\fB\-L\fP\ \fIloglevel\fP\ |\ \fB––loglevel=\fP\fIloglevel\fP]
+[\fB\-l\fP\ \fIfilename\fP\ |\ \fB––logfile=\fP‌\fIfilename\fP]
+[\fB\-o\fP\ \fIoption\fP\ |\ \fB––option=\fP\fIoption\fP]
+[\fB\-r\fP\ |\ \fB––rewrite\fP]
+[\fB\-S\fP\ |\ \fB––list\-sections\fP]
+[\fB\-s\fP\ \fIsection\fP\ |\ \fB––section=\fP\fIsection\fP]
+[\fB\-V\fP\ \fIvalue\fP\ |\ \fB––value=\fP\fIvalue\fP]
+[\fB\-v\fP\ |\ \fB––version\fP]
+.SH DESCRIPTION
+.sp
+\fBanastasis\-config\fP can be used to read or modify Anastasis configuration 
files.
+.INDENT 0.0
+.TP
+\fB\-b\fP \fIBACKEND\fP | \fB––supported\-backend=\fP\fIBACKEND\fP
+Tests whether the specified \fIBACKEND\fP is supported by the current 
installation.
+The backend must match the name of a plugin, i.e. “namestore_postgres” for
+the Postgres database backend of the “NAMESTORE” service.  If \fIBACKEND\fP is
+supported, anastasis\-config will return a status code of 0 (success), 
otherwise
+77 (unsupported).  When this option is specified, no other options may be
+specified. Specifying this option together with other options will cause
+anastasis\-config to return a status code of 1 (error).
+.TP
+\fB\-c\fP \fIFILENAME\fP | \fB––config=\fP\fIFILENAME\fP
+Use the configuration file \fIFILENAME\fP\&.
+.TP
+\fB\-f\fP | \fB––filename\fP
+Try to perform expansions as if the option values represent filenames (will
+also be applied even if the option is not really a filename).
+.TP
+\fB\-F\fP | \fB––full\fP
+Write the full configuration file, not just the differences to the defaults.
+.TP
+\fB\-h\fP | \fB––help\fP
+Print short help on options.
+.TP
+\fB\-L\fP \fILOGLEVEL\fP | \fB––loglevel=\fP\fILOGLEVEL\fP
+Use \fILOGLEVEL\fP for logging.
+Valid values are \fBDEBUG\fP, \fBINFO\fP, \fBWARNING\fP, and \fBERROR\fP\&.
+.TP
+\fB\-l\fP \fIFILENAME\fP | \fB––logfile=\fP‌\fIFILENAME\fP
+Send logging output to \fIFILENAME\fP\&.
+.TP
+\fB\-o\fP \fIOPTION\fP | \fB––option=\fP\fIOPTION\fP
+Which configuration option should be accessed or edited.  Required to set a
+value.  If not given, all values of a given section will be printed in the
+format “OPTION = VALUE”.
+.TP
+\fB\-r\fP | \fB––rewrite\fP
+Write the configuration file even if nothing changed. Will remove all comments!
+.TP
+\fB\-S\fP | \fB––list\-sections\fP
+List available configuration sections for use with \fB\-\-section\fP\&.
+.TP
+\fB\-s\fP \fISECTION\fP | \fB––section=\fP\fISECTION\fP
+Which configuration section should be accessed or edited.
+Required option.
+.TP
+\fB\-V\fP \fIVALUE\fP | \fB––value=\fP\fIVALUE\fP
+Configuration value to store in the given section under the given option.
+Must only be given together with \fB\-s\fP and \fB\-o\fP options.
+.INDENT 7.0
+.TP
+.B Note:
+Changing the configuration file with \fB\-V\fP will remove comments
+and may reorder sections and remove \fB@INLINE@\fP directives.
+.UNINDENT
+.TP
+\fB\-v\fP | \fB––version\fP
+Print Anastasis version number.
+.UNINDENT
+.SH SEE ALSO
+.sp
+anastasis.conf(5)
+.SH BUGS
+.sp
+Report bugs by using \fI\%https://bugs.anastasis.lu\fP or by sending electronic
+mail to <\fI\%contact@anastasis.lu\fP>.
+.SH AUTHOR
+Anastasis SARL
+.SH COPYRIGHT
+2020-2021 Anastasis SARL (AGPLv3+ or GFDL 1.3+)
+.\" Generated by docutils manpage writer.
+.
diff --git a/doc/anastasis-figures/anastasis_reducer_backup.png 
b/doc/anastasis-figures/anastasis_reducer_backup.png
index 87b0a9b..53daf7c 100644
Binary files a/doc/anastasis-figures/anastasis_reducer_backup.png and 
b/doc/anastasis-figures/anastasis_reducer_backup.png differ
diff --git a/doc/anastasis-figures/anastasis_reducer_recovery.png 
b/doc/anastasis-figures/anastasis_reducer_recovery.png
index 7d3cc9a..b08c763 100644
Binary files a/doc/anastasis-figures/anastasis_reducer_recovery.png and 
b/doc/anastasis-figures/anastasis_reducer_recovery.png differ
diff --git a/doc/anastasis-httpd.1 b/doc/anastasis-httpd.1
index 5e723f2..131be44 100644
--- a/doc/anastasis-httpd.1
+++ b/doc/anastasis-httpd.1
@@ -1,37 +1,78 @@
-.TH ANASTASIS\-HTTPD 1 "Nov 9, 2019" "GNU Taler"
-
+.\" Man page generated from reStructuredText.
+.
+.TH "ANASTASIS-HTTPD" "1" "Jul 18, 2021" "0.0" "Anastasis"
 .SH NAME
-anastasis\-httpd \- Run Anastasis backend (with RESTful API)
-
+anastasis-httpd \- anastasis HTTP backend
+.
+.nr rst2man-indent-level 0
+.
+.de1 rstReportMargin
+\\$1 \\n[an-margin]
+level \\n[rst2man-indent-level]
+level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
+-
+\\n[rst2man-indent0]
+\\n[rst2man-indent1]
+\\n[rst2man-indent2]
+..
+.de1 INDENT
+.\" .rstReportMargin pre:
+. RS \\$1
+. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
+. nr rst2man-indent-level +1
+.\" .rstReportMargin post:
+..
+.de UNINDENT
+. RE
+.\" indent \\n[an-margin]
+.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.nr rst2man-indent-level -1
+.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
+..
 .SH SYNOPSIS
-.B anastasis\-httpd
-.RI [ options ]
-.br
-
+.sp
+\fBanastasis\-httpd\fP
 .SH DESCRIPTION
-\fBanastasis\-httpd\fP is a command line tool to run the Anastasis (HTTP 
backend).  The required configuration and database must exist before running 
this command.
-
-.SH OPTIONS
-.B
-.IP "\-C,  \-\-connection-close"
-Force each HTTP connection to be closed after each request (useful in 
combination with \-f to avoid having to wait for nc to time out).
-.B
-.IP "\-c FILENAME,  \-\-config=FILENAME"
-Use the configuration and other resources for the merchant to operate from 
FILENAME.
-.B
-.IP "\-h, \-\-help"
+.sp
+Banastasis\-httpd is a command line tool to run the Anastasis (HTTP
+backend).  The required configuration and database must exist before
+running this command.
+.sp
+Its options are as follows:
+.INDENT 0.0
+.TP
+\fB\-C\fP | \fB–connection\-close\fP
+Force each HTTP connection to be closed after each request.
+.TP
+\fB\-c\fP \fIFILENAME\fP | \fB––config=\fP‌\fIFILENAME\fP
+Use the configuration and other resources for the merchant to operate
+from FILENAME.
+.TP
+\fB\-h\fP | \fB––help\fP
 Print short help on options.
-.B
-.IP "\-v, \-\-version"
+.TP
+\fB\-v\fP | \fB––version\fP
 Print version information.
-
+.UNINDENT
 .SH SIGNALS
-.B
-.IP SIGTERM
+.sp
+\fBanastasis\-httpd\fP responds to the following signals:
+.INDENT 0.0
+.TP
+.B \fBSIGTERM\fP
 Sending a SIGTERM to the process will cause it to shutdown cleanly.
-
+.UNINDENT
+.SH SEE ALSO
+.sp
+anastasis\-dbinit(1), anastasis\-config(1), anastasis\-gtk(1), 
anastasis\-reducer(1)
 .SH BUGS
-Report bugs by using Mantis <https://gnunet.org/bugs/> or by sending 
electronic mail to <taler@gnu.org>
-
-.SH "SEE ALSO"
-\fBanastasis-dbinit\fP(1), \fBanastasis\-tip\-enable\fP(1), 
\fBanastasis.conf\fP(5)
+.sp
+Report bugs by using \fI\%https://bugs.anastasis.lu\fP or by sending
+electronic mail to <\fI\%contact@anastasis.lu\fP>.
+.SH AUTHOR
+Anastasis SARL
+.SH COPYRIGHT
+2020-2021 Anastasis SARL (AGPLv3+ or GFDL 1.3+)
+.\" Generated by docutils manpage writer.
+.
diff --git a/doc/anastasis-reducer.1 b/doc/anastasis-reducer.1
new file mode 100644
index 0000000..8a79075
--- /dev/null
+++ b/doc/anastasis-reducer.1
@@ -0,0 +1,93 @@
+.\" Man page generated from reStructuredText.
+.
+.TH "ANASTASIS-REDUCER" "1" "Jul 18, 2021" "0.0" "Anastasis"
+.SH NAME
+anastasis-reducer \- anastasis CLI frontend
+.
+.nr rst2man-indent-level 0
+.
+.de1 rstReportMargin
+\\$1 \\n[an-margin]
+level \\n[rst2man-indent-level]
+level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
+-
+\\n[rst2man-indent0]
+\\n[rst2man-indent1]
+\\n[rst2man-indent2]
+..
+.de1 INDENT
+.\" .rstReportMargin pre:
+. RS \\$1
+. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
+. nr rst2man-indent-level +1
+.\" .rstReportMargin post:
+..
+.de UNINDENT
+. RE
+.\" indent \\n[an-margin]
+.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.nr rst2man-indent-level -1
+.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
+..
+.SH SYNOPSIS
+.sp
+\fBanastasis\-reducer\fP
+[\fB\-a**_*JSON*_|_\fP–arguments=\fIJSON\fP]
+[\fB\-b**_|_\fP–backup]
+[\fB\-c\fP\ \fIFILENAME\fP\ |\ \fB––config=\fP‌\fIFILENAME\fP]
+[\fB\-h\fP\ |\ \fB––help\fP]
+[\fB\-L\fP\ \fILOGLEVEL\fP\ |\ \fB––loglevel=\fP‌\fILOGLEVEL\fP]
+[\fB\-l\fP\ \fIFILENAME\fP\ |\ \fB––logfile=\fP‌\fIFILENAME\fP]
+[\fB\-r**_|_\fP–restore]
+[\fB\-v\fP\ |\ \fB––version\fP] COMMAND
+.SH DESCRIPTION
+.sp
+\fBanastasis\-reducer\fP is a command\-line tool to run Anastasis
+key recover and backup operations using a reducer\-style interface.
+The reducer will read the current state from standard input and
+write the resulting state to standard output.  A COMMAND must
+be given on the command line.  The arguments (if any) are to
+be given in JSON format to the \fB\-a\fP option.  A list of
+commands can be found in the \&../reducer
+chapter.
+.INDENT 0.0
+.TP
+\fB\-a\fP \fIJSON\fP | \fB––arguments=\fP\fIJSON\fP
+Provide JSON inputs for the given command.
+.TP
+\fB\-b\fP | \fB–backup\fP
+Begin fresh reducer operation for a back up operation.
+.TP
+\fB\-c\fP \fIFILENAME\fP | \fB––config=\fP‌\fIFILENAME\fP
+Use the configuration from \fIFILENAME\fP\&.
+.TP
+\fB\-h\fP | \fB––help\fP
+Print short help on options.
+.TP
+\fB\-L\fP \fILOGLEVEL\fP | \fB––loglevel=\fP‌\fILOGLEVEL\fP
+Specifies the log level to use. Accepted values are: \fBDEBUG\fP, \fBINFO\fP,
+\fBWARNING\fP, \fBERROR\fP\&.
+.TP
+\fB\-l\fP \fIFILENAME\fP | \fB––logfile=\fP‌\fIFILENAME\fP
+Send logging output to \fIFILENAME\fP\&.
+.TP
+\fB\-r\fP | \fB–restore\fP
+Begin fresh reducer operation for a restore operation.
+.TP
+\fB\-v\fP | \fB––version\fP
+Print version information.
+.UNINDENT
+.SH SEE ALSO
+.sp
+anastasis\-gtk(1), anastasis\-httpd(1), anastasis.conf(5).
+.SH BUGS
+.sp
+Report bugs by using \fI\%https://bugs.anastasis.lu/\fP or by sending 
electronic
+mail to <\fI\%contact@anastasis.lu\fP>.
+.SH AUTHOR
+Anastasis SARL
+.SH COPYRIGHT
+2020-2021 Anastasis SARL (AGPLv3+ or GFDL 1.3+)
+.\" Generated by docutils manpage writer.
+.
diff --git a/doc/anastasis.conf.5 b/doc/anastasis.conf.5
new file mode 100644
index 0000000..446531a
--- /dev/null
+++ b/doc/anastasis.conf.5
@@ -0,0 +1,151 @@
+.\" Man page generated from reStructuredText.
+.
+.TH "ANASTASIS.CONF" "5" "Jul 18, 2021" "0.0" "Anastasis"
+.SH NAME
+anastasis.conf \- anastasis configuration file
+.
+.nr rst2man-indent-level 0
+.
+.de1 rstReportMargin
+\\$1 \\n[an-margin]
+level \\n[rst2man-indent-level]
+level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
+-
+\\n[rst2man-indent0]
+\\n[rst2man-indent1]
+\\n[rst2man-indent2]
+..
+.de1 INDENT
+.\" .rstReportMargin pre:
+. RS \\$1
+. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
+. nr rst2man-indent-level +1
+.\" .rstReportMargin post:
+..
+.de UNINDENT
+. RE
+.\" indent \\n[an-margin]
+.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.nr rst2man-indent-level -1
+.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
+..
+.SH DESCRIPTION
+.sp
+The configuration file is line\-oriented.
+Blank lines and whitespace at the beginning and end of a line are ignored.
+Comments start with \fB#\fP or \fB%\fP in the first column
+(after any beginning\-of\-line whitespace) and go to the end of the line.
+.sp
+The file is split into sections.
+Every section begins with “[SECTIONNAME]” and
+contains a number of options of the form “OPTION=VALUE”.
+There may be whitespace around the \fB=\fP (equal sign).
+Section names and options are \fIcase\-insensitive\fP\&.
+.sp
+The values, however, are \fIcase\-sensitive\fP\&.
+In particular, boolean values are one of \fBYES\fP or \fBNO\fP\&.
+Values can include whitespace by surrounding
+the entire value with \fB"\fP (double quote).
+Note, however, that there are no escape characters in such strings;
+all characters between the double quotes (including other double quotes)
+are taken verbatim.
+.sp
+Values that represent filenames can begin with a \fB/bin/sh\fP\-like
+variable reference.
+This can be simple, such as \fB$TMPDIR/foo\fP, or complex,
+such as \fB${TMPDIR:\-${TMP:\-/tmp}}/foo\fP\&.
+See \fB[PATHS]\fP (below).
+.sp
+Values that represent a time duration are represented as a series of one or
+more \fBNUMBER UNIT\fP pairs, e.g. \fB60 s\fP, \fB4 weeks 1 day\fP, \fB5 years 
2 minutes\fP\&.
+.sp
+Values that represent an amount are in the usual amount syntax:
+\fBCURRENCY:VALUE.FRACTION\fP, e.g. \fBEUR:1.50\fP\&.
+The \fBFRACTION\fP portion may extend up to 8 places.
+.sp
+Files containing default values for many of the options described below
+are installed under \fB$ANASTASIS_PREFIX/share/taler/config.d/\fP\&.
+The configuration file given with \fB\-c\fP to Anastasis binaries
+overrides these defaults.
+.sp
+A configuration file may include another, by using the \fB@INLINE@\fP 
directive,
+for example, in \fBmain.conf\fP, you could write \fB@INLINE@ sub.conf\fP to
+include the entirety of \fBsub.conf\fP at that point in \fBmain.conf\fP\&.
+.. TODO: Document ‘anastasis\-config \-V’ in light of ‘@INLINE@’ in 
taler\-config(1).
+.SS GLOBAL OPTIONS
+.sp
+The following options are from the \fB[anastasis]\fP section and used by
+the \fBanastasis\-httpd\fP service.
+.INDENT 0.0
+.TP
+.B PAYMENT_BACKEND_URL
+Base\-URL of the Taler merchant backend instance to use for payments.
+FIXME: How do we pass the access token?
+.TP
+.B ANNUAL_FEE
+Annual fee to be paid for policy uploads, i.e. “EUR:1.5”.
+.TP
+.B TRUTH_UPLOAD_FEE
+Annual fee to be paid for truth uploads, i.e. “EUR:1.5”.
+.TP
+.B DB
+Database backend to use, only \fBpostgres\fP is supported right now.
+.TP
+.B UPLOAD_LIMIT_MB
+Maximum upload size for policy uploads in megabytes. Default is 1.
+.TP
+.B ANNUAL_POLICY_UPLOAD_LIMIT
+Maximum number of policies uploaded per year of service. Default is 42.
+.TP
+.B BUSINESS_NAME
+Name of the business.
+.TP
+.B SERVER_SALT
+Must be set to a high\-entropy random server salt that the provider must never
+change after the initial configuration.
+.TP
+.B PORT
+TCP port on which the HTTP service should listen on.
+.UNINDENT
+.SS Authorization options
+.sp
+For each active authorization plugin, options must be configured in
+a section called \fB[authorization\-$PLUGIN]\fP where \fB$PLUGIN\fP is
+the name of the authorization plugin.
+.INDENT 0.0
+.TP
+.B COST
+Fee the user has to pay to obtain a challenge from this
+authorization plugin during recovery.
+.TP
+.B ENABLED
+\fByes\fP to enable this plugin, \fBno\fP to disable.
+.TP
+.B COMMAND
+Helper command to run (only relevant for some plugins).
+.UNINDENT
+.SS Postgres database configuration
+.sp
+The following options must be in the section \fB[statis\-postgres]\fP if
+\fBpostgress\fP was used for the database under \fBDB\fP in the
+\fB[anastasis]\fP section.
+.INDENT 0.0
+.TP
+.B CONFIG
+Path under which the Postgres database is that the service
+should use, i.e. \fBpostgres://anastasis\fP\&.
+.UNINDENT
+.SH SEE ALSO
+.sp
+anastasis\-httpd(1), anastasis\-config(1)
+.SH BUGS
+.sp
+Report bugs by using \fI\%https://bugs.anastasis.lu/\fP or by sending 
electronic
+mail to <\fI\%contact@anastasis.lu\fP>.
+.SH AUTHOR
+Anastasis SARL
+.SH COPYRIGHT
+2020-2021 Anastasis SARL (AGPLv3+ or GFDL 1.3+)
+.\" Generated by docutils manpage writer.
+.
diff --git a/doc/anastasis.texi b/doc/anastasis.texi
index 3a7605b..466adaf 100644
--- a/doc/anastasis.texi
+++ b/doc/anastasis.texi
@@ -21,11 +21,11 @@
 
 @copying
 @quotation
-Anastasis 0.0.0, Apr 05, 2021
+Anastasis 0.0.0pre0, Jul 18, 2021
 
-Anastasis team
+Anastasis SARL
 
-Copyright @copyright{} 2014-2021 Anastasis SARL (GPLv3+ or GFDL 1.3+)
+Copyright @copyright{} 2020-2021 Anastasis SARL (AGPLv3+ or GFDL 1.3+)
 @end quotation
 
 @end copying
@@ -47,25 +47,308 @@ Copyright @copyright{} 2014-2021 Anastasis SARL (GPLv3+ or 
GFDL 1.3+)
 @end ifnottex
 
 @c %**start of body
-@anchor{anastasis doc}@anchor{0}
-@c This file is part of Anastasis
-@c Copyright (C) 2019. 2021 Anastasis SARL
-@c
+@anchor{index doc}@anchor{0}
+@c This file is part of GNU Anastasis.
+@c Copyright (C) 2020-2021 Anastasis SARL
+@c 
 @c Anastasis is free software; you can redistribute it and/or modify it under 
the
-@c terms of the GNU General Public License as published by the Free Software
+@c terms of the GNU Affero General Public License as published by the Free 
Software
 @c Foundation; either version 2.1, or (at your option) any later version.
-@c
+@c 
 @c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
 @c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
 @c A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more 
details.
-@c
-@c You should have received a copy of the GNU Lesser General Public License 
along with
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
+
+The system will be based on free software and open protocols.
+
+@menu
+* Documentation Overview:: 
+
+@detailmenu
+ --- The Detailed Node Listing ---
+
+Documentation Overview
+
+* Introduction:: 
+* Installation:: 
+* Configuration:: 
+* Cryptography:: 
+* REST API:: 
+* Reducer API:: 
+* Authentication Methods:: 
+* DB Schema:: 
+* Design Documents:: 
+* Anastasis licensing information:: 
+* Man Pages:: 
+* Complete Index:: 
+* GNU Free Documentation License:: 
+
+Installation
+
+* Installing from source:: 
+* Installing Anastasis binary packages on Debian:: 
+* Installing Anastasis binary packages on Ubuntu:: 
+
+Installing from source
+
+* Installing GNUnet:: 
+* Installing the Taler Exchange:: 
+* Installing the Taler Merchant:: 
+* Installing Anastasis:: 
+* Installing GNUnet-gtk:: 
+* Installing Anastasis-gtk:: 
+
+Installing Anastasis binary packages on Debian
+
+* Installing the graphical front-end:: 
+* Installing the backend:: 
+
+Installing Anastasis binary packages on Ubuntu
+
+* Installing the graphical front-end: Installing the graphical front-end<2>. 
+* Installing the backend: Installing the backend<2>. 
+
+Configuration
+
+* Configuration format:: 
+* Using anastasis-config:: 
+
+Cryptography
+
+* Key derivations:: 
+* Key Usage:: 
+* Availability Considerations:: 
+
+Key derivations
+
+* Verification:: 
+* Encryption:: 
+
+Key Usage
+
+* Encryption: Encryption<2>. 
+* Signatures:: 
+
+REST API
+
+* HTTP Request and Response:: 
+* Protocol Version Ranges:: 
+* Common encodings:: 
+
+Common encodings
+
+* Binary Data:: 
+* Hash codes:: 
+* Large numbers:: 
+* Timestamps:: 
+* Integers:: 
+* Objects:: 
+* Keys:: 
+* Signatures: Signatures<2>. 
+* Amounts:: 
+* Time:: 
+* Cryptographic primitives:: 
+* Signatures: Signatures<3>. 
+* Receiving Configuration:: 
+* Receiving Terms of Service:: 
+* Manage policy:: 
+* Managing truth:: 
+
+Reducer API
+
+* States:: 
+* Backup Reducer:: 
+* Recovery Reducer:: 
+* Reducer transitions:: 
+
+Reducer transitions
+
+* Initial state:: 
+* Common transitions:: 
+* Backup transitions:: 
+* Recovery transitions:: 
+
+Authentication Methods
+
+* SMS (sms): SMS sms. 
+* Email verification (email): Email verification email. 
+* Video identification (vid): Video identification vid. 
+* Security question (qa): Security question qa. 
+* Snail mail verification (post): Snail mail verification post. 
+
+Design Documents
+
+* Design Doc 001; Anastasis User Experience: Design Doc 001 Anastasis User 
Experience. 
+* Template:: 
+
+Design Doc 001: Anastasis User Experience
+
+* Summary:: 
+* Motivation:: 
+* Setup Steps:: 
+* Show Service Status After Setup:: 
+* Recovery Steps:: 
+
+Setup Steps
+
+* Entry point; Settings: Entry point Settings. 
+* Providing Identification:: 
+* Add Authentication Methods:: 
+* Confirm/Change Service Providers:: 
+* Defining Recovery Options:: 
+* Pay for Setup:: 
+
+Recovery Steps
+
+* Entry point; Settings: Entry point Settings<2>. 
+* Providing Identification: Providing Identification<2>. 
+* Select Authentication Challenge:: 
+* Payment:: 
+* Enter Challenge Response:: 
+* Success:: 
+
+Template
+
+* Summary: Summary<2>. 
+* Motivation: Motivation<2>. 
+* Requirements:: 
+* Proposed Solution:: 
+* Alternatives:: 
+* Drawbacks:: 
+* Discussion / Q&A:: 
+
+Anastasis licensing information
+
+* Anastasis (git;//git.taler.net/anastasis): Anastasis git //git taler 
net/anastasis. 
+* Anastasis-gtk (git;//git.taler.net/anastasis-gtk): Anastasis-gtk git //git 
taler net/anastasis-gtk. 
+* Documentation:: 
+
+Anastasis (git://git.taler.net/anastasis)
+
+* Runtime dependencies:: 
+
+Anastasis-gtk (git://git.taler.net/anastasis-gtk)
+
+* Runtime dependencies: Runtime dependencies<2>. 
+
+Man Pages
+
+* anastasis-config(1): anastasis-config 1. 
+* anastasis-gtk(1): anastasis-gtk 1. 
+* anastasis-httpd(1): anastasis-httpd 1. 
+* anastasis-reducer(1): anastasis-reducer 1. 
+* anastasis.conf(5): anastasis conf 5. 
+
+anastasis-config(1)
+
+* Synopsis:: 
+* Description:: 
+* See Also:: 
+* Bugs:: 
+
+anastasis-gtk(1)
+
+* Synopsis: Synopsis<2>. 
+* Description: Description<2>. 
+* See Also: See Also<2>. 
+* Bugs: Bugs<2>. 
+
+anastasis-httpd(1)
+
+* Synopsis: Synopsis<3>. 
+* Description: Description<3>. 
+* Signals:: 
+* See also:: 
+* Bugs: Bugs<3>. 
+
+anastasis-reducer(1)
+
+* Synopsis: Synopsis<4>. 
+* Description: Description<4>. 
+* See Also: See Also<3>. 
+* Bugs: Bugs<4>. 
+
+anastasis.conf(5)
+
+* Description: Description<5>. 
+* SEE ALSO:: 
+* BUGS:: 
+
+Description
+
+* GLOBAL OPTIONS:: 
+* Authorization options:: 
+* Postgres database configuration:: 
+
+GNU Free Documentation License
+
+* 0. PREAMBLE: 0 PREAMBLE. 
+* 1. APPLICABILITY AND DEFINITIONS: 1 APPLICABILITY AND DEFINITIONS. 
+* 2. VERBATIM COPYING: 2 VERBATIM COPYING. 
+* 3. COPYING IN QUANTITY: 3 COPYING IN QUANTITY. 
+* 4. MODIFICATIONS: 4 MODIFICATIONS. 
+* 5. COMBINING DOCUMENTS: 5 COMBINING DOCUMENTS. 
+* 6. COLLECTIONS OF DOCUMENTS: 6 COLLECTIONS OF DOCUMENTS. 
+* 7. AGGREGATION WITH INDEPENDENT WORKS: 7 AGGREGATION WITH INDEPENDENT WORKS. 
+* 8. TRANSLATION: 8 TRANSLATION. 
+* 9. TERMINATION: 9 TERMINATION. 
+* 10. FUTURE REVISIONS OF THIS LICENSE: 10 FUTURE REVISIONS OF THIS LICENSE. 
+* 11. RELICENSING: 11 RELICENSING. 
+* ADDENDUM; How to use this License for your documents: ADDENDUM How to use 
this License for your documents. 
+
+@end detailmenu
+@end menu
+
+@node Documentation Overview,,Top,Top
+@anchor{index anastasis-documentation}@anchor{1}@anchor{index 
documentation-overview}@anchor{2}
+@chapter Documentation Overview
+
+
+@c This file is part of Anastasis
+@c Copyright (C) 2019-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero General Public License as published by the Free 
Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
 @c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
-@c
+@c 
 @c @author Christian Grothoff
 @c @author Dominik Meister
 @c @author Dennis Neufeld
 
+@menu
+* Introduction:: 
+* Installation:: 
+* Configuration:: 
+* Cryptography:: 
+* REST API:: 
+* Reducer API:: 
+* Authentication Methods:: 
+* DB Schema:: 
+* Design Documents:: 
+* Anastasis licensing information:: 
+* Man Pages:: 
+* Complete Index:: 
+* GNU Free Documentation License:: 
+
+@end menu
+
+@node Introduction,Installation,,Documentation Overview
+@anchor{introduction doc}@anchor{3}@anchor{introduction introduction}@anchor{4}
+@section Introduction
+
+
 Anastasis is a service that allows the user to securely deposit a
 @strong{core secret} with an open set of escrow providers and recover it if 
the secret is
 lost.  The @strong{core secret} itself is protected from the escrow providers 
by
@@ -114,2681 +397,5648 @@ guarding a user’s secret.  Weak adversaries must not 
be able to deduce
 information about a user’s @strong{recovery document} (except for its length, 
which
 may be exposed to an adversary which monitors the user’s network traffic).
 
-@menu
-* Anastasis DB Schema::
-* Anastasis Cryptography::
-* Anastasis REST API::
-* Anastasis Reducer API::
-* Authentication Methods::
-
-@end menu
-
-@node Anastasis DB Schema,Anastasis Cryptography,Top,Top
-@anchor{anastasis anastasis}@anchor{1}@anchor{anastasis 
anastasis-db-schema}@anchor{2}
-@chapter Anastasis DB Schema
+@c This file is part of Anastasis
+@c Copyright (C) 2019-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero General Public License as published by the Free 
Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
+@c @author Dominik Meister
+@c @author Dennis Neufeld
 
+@node Installation,Configuration,Introduction,Documentation Overview
+@anchor{installation doc}@anchor{5}@anchor{installation installation}@anchor{6}
+@section Installation
 
-@image{anastasis-figures/anastasis-db,,,,png}
 
-@image{anastasis-figures/anastasis_challengecode,,,,png}
+Please install the following packages before proceeding with the
+exchange compilation.
 
-@image{anastasis-figures/anastasis_challenge_payment,,,,png}
 
-@image{anastasis-figures/anastasis_truth,,,,png}
+@itemize -
 
-@image{anastasis-figures/anastasis_truth_payment,,,,png}
+@item 
+libsqlite3 >= 3.16.2
 
-@node Anastasis Cryptography,Anastasis REST API,Anastasis DB Schema,Top
-@anchor{anastasis anastasis-cryptography}@anchor{3}
-@chapter Anastasis Cryptography
+@item 
+GNU libunistring >= 0.9.3
 
+@item 
+libcurl >= 7.26 (or libgnurl >= 7.26)
 
-When a user needs to interact with Anastasis, the system first derives some key
-material, but not the master secret, from the user’s @strong{identifier} using
-different HKDFs.  These HKDFs are salted using the respective escrow
-provider’s @strong{server salt}, which ensures that the accounts for the same 
user
-cannot be easily correlated across the various Anastasis servers.
+@item 
+libqrencode >= 4.0.0
 
-Each Anastasis server uses an EdDSA @strong{account key} to identify the 
account of
-the user.  The account private key is derived from the user’s 
@strong{identifier} using
-a computationally expensive cryptographic hash function.  Using an
-expensive hash algorithm is assumed to make it infeasible for a weak adversary 
to
-determine account keys by brute force (without knowing the user’s identifier).
-However, it is assumed that a strong adversary performing a targeted attack can
-compute the account key pair.
+@item 
+GNU libgcrypt >= 1.6
 
-The public account key is Crockford base32-encoded in the URI to identify the
-account, and used to sign requests.  These signatures are also provided in
-base32-encoding and transmitted using the HTTP header
-“Anastasis-Account-Signature”.
+@item 
+libsodium >= 1.0
 
-When confidential data is uploaded to an Anastasis server, the respective
-payload is encrypted using AES-GCM with a symmetric key and initialization
-vector derived from the @strong{identifier} and a high-entropy @strong{nonce}. 
 The
-nonce and the GCM tag are prepended to the ciphertext before being uploaded to
-the Anastasis server.  This is done whenever confidential data is stored with
-the server.
+@item 
+libargon2 >= 20171227
 
-The @strong{core secret} of the user is (AES) encrypted using a symmetric 
@strong{master
-key}.  Recovering this master key requires the user to satisfy a particular
-@strong{policy}.  Policies specify a set of @strong{escrow methods}, each of 
which leads
-the user to a @strong{key share}. Combining those key shares (by hashing) 
allows
-the user to obtain a @strong{policy key}, which can be used to decrypt the 
@strong{master
-key}.  There can be many policies, satisfying any of these will allow the
-user to recover the master key.  A @strong{recovery document} contains the
-encrypted @strong{core secret}, a set of escrow methods and a set of policies.
+@item 
+libjansson >= 2.7
 
-@menu
-* Key derivations::
-* Key Usage::
-* Availability Considerations::
+@item 
+Postgres >= 9.6, including libpq
 
-@end menu
+@item 
+GNU libmicrohttpd >= 0.9.71
 
-@node Key derivations,Key Usage,,Anastasis Cryptography
-@anchor{anastasis key-derivations}@anchor{4}
-@section Key derivations
+@item 
+GNUnet >= 0.14.0 (from source 
tarball@footnote{http://ftpmirror.gnu.org/gnunet/})
 
+@item 
+GNU Taler exchange
 
-EdDSA and ECDHE public keys are always points on Curve25519 and represented
-using the standard 256 bit Ed25519 compact format.  The binary representation
-is converted to Crockford Base32 when transmitted inside JSON or as part of
-URLs.
+@item 
+GNU Taler merchant backend
+@end itemize
 
-To start, a user provides their private, unique and unforgettable
-@strong{identifier} as a seed to identify their account.  For example, this 
could
-be a social security number together with their full name.  Specifics may
-depend on the cultural context, in this document we will simply refer to this
-information as the @strong{identifier}.
+Except for the last two, these are available in most GNU/Linux distributions
+and should just be installed using the respective package manager.
 
-This identifier will be first hashed with Argon2, to provide a @strong{kdf_id}
-which will be used to derive other keys later. The Hash must also include the
-respective @strong{server_salt}. This also ensures that the @strong{kdf_id} is 
different
-on each server. The use of Argon2 and the respective @strong{server_salt} is 
intended
-to make it difficult to brute-force @strong{kdf_id} values and help protect 
the user’s
-privacy. Also this ensures that the @strong{kdf_id}s on every server differs. 
However,
-we do not assume that the @strong{identifier} or the @strong{kdf_id} cannot be
-determined by an adversary performing a targeted attack, as a user’s
-@strong{identifier} is likely to always be known to state actors and may
-likely also be available to other actors.
+@menu
+* Installing from source:: 
+* Installing Anastasis binary packages on Debian:: 
+* Installing Anastasis binary packages on Ubuntu:: 
 
-@example
-kdf_id := Argon2( identifier, server_salt, keysize )
-@end example
+@end menu
 
-@strong{identifier}: The secret defined from the user beforehand.
+@node Installing from source,Installing Anastasis binary packages on 
Debian,,Installation
+@anchor{installation installing-from-source}@anchor{7}
+@subsection Installing from source
 
-@strong{server_salt}: The salt from the Server.
 
-@strong{keysize}: The desired output size of the KDF, here 32 bytes.
+The following instructions will show how to install libgnunetutil and
+the GNU Taler exchange from source.
 
 @menu
-* Verification::
-* Encryption::
+* Installing GNUnet:: 
+* Installing the Taler Exchange:: 
+* Installing the Taler Merchant:: 
+* Installing Anastasis:: 
+* Installing GNUnet-gtk:: 
+* Installing Anastasis-gtk:: 
 
 @end menu
 
-@node Verification,Encryption,,Key derivations
-@anchor{anastasis verification}@anchor{5}
-@subsection Verification
+@node Installing GNUnet,Installing the Taler Exchange,,Installing from source
+@anchor{installation installing-gnunet}@anchor{8}
+@subsubsection Installing GNUnet
 
 
-For users to authorize “policy” operations we need an EdDSA key pair.  As we
-cannot assure that the corresponding private key is truly secret, such policy
-operations must never be destructive: Should an adversary learn the private
-key, they could access (and with the @strong{kdf_id} decrypt) the user’s 
policy (but
-not the core secret), or upload a new version of the
-@strong{encrypted recovery document} (but not delete an existing version).
+Before you install GNUnet, you must download and install the dependencies
+mentioned in the previous section, otherwise the build may succeed, but could
+fail to export some of the tooling required by GNU Taler.
 
-For the generation of the private key we use the @strong{kdf_id} as the 
entropy source,
-hash it to derive a base secret which will then be processed to fit the
-requirements for EdDSA private keys.  From the private key we can then
-generate the corresponding public key.  Here, “ver” is used as a salt for the
-HKDF to ensure that the result differs from other cases where we hash
-@strong{kdf_id}.
+To install GNUnet, unpack the tarball and change
+into the resulting directory, then proceed as follows:
 
 @example
-ver_secret := HKDF(kdf_id, "ver", keysize)
-eddsa_priv := eddsa_d_to_a(ver_secret)
-eddsa_pub := get_EdDSA_Pub(eddsa_priv)
+$ ./configure [--prefix=GNUNETPFX]
+$ # Each dependency can be fetched from non standard locations via
+$ # the '--with-<LIBNAME>' option. See './configure --help'.
+$ make
+# make install
+# ldconfig
 @end example
 
-@strong{HKDF()}: The HKDF-function uses two phases: First we use HMAC-SHA512 
for the extraction phase, then HMAC-SHA256 is used for expansion phase.
-
-@strong{kdf_id}: Hashed identifier.
+If you did not specify a prefix, GNUnet will install to @code{/usr/local},
+which requires you to run the last step as @code{root}.
+The @code{ldconfig} command (also run as @code{root}) makes the
+shared object libraries (@code{.so} files)
+visible to the various installed programs.
 
-@strong{key_size}: Size of the output, here 32 bytes.
+@node Installing the Taler Exchange,Installing the Taler Merchant,Installing 
GNUnet,Installing from source
+@anchor{installation installing-the-taler-exchange}@anchor{9}
+@subsubsection Installing the Taler Exchange
 
-@strong{ver_secret}: Derived key from the kdf_id, serves as intermediate step 
for the generation of the private key.
 
-@strong{eddsa_d_to_a()}: Function which converts the ver_key to a valid EdDSA 
private key. Specifically, assuming the value eddsa_priv is in a 32-byte array 
“digest”, the function clears and sets certain bits as follows:
+After installing GNUnet, unpack the GNU Taler exchange tarball,
+change into the resulting directory, and proceed as follows:
 
 @example
-digest[0] = (digest[0] & 0x7f) | 0x40;
-digest[31] &= 0xf8;
+$ ./configure [--prefix=EXCHANGEPFX] \
+              [--with-gnunet=GNUNETPFX]
+$ # Each dependency can be fetched from non standard locations via
+$ # the '--with-<LIBNAME>' option. See './configure --help'.
+$ make
+# make install
 @end example
 
-@strong{eddsa_priv}: The generated EdDSA private key.
+If you did not specify a prefix, the exchange will install to 
@code{/usr/local},
+which requires you to run the last step as @code{root}.  You have to specify
+@code{--with-gnunet=/usr/local} if you installed GNUnet to @code{/usr/local} 
in the
+previous step.
 
-@strong{eddsa_pub}: The generated EdDSA public key.
+@node Installing the Taler Merchant,Installing Anastasis,Installing the Taler 
Exchange,Installing from source
+@anchor{installation installing-the-taler-merchant}@anchor{a}
+@subsubsection Installing the Taler Merchant
 
-@node Encryption,,Verification,Key derivations
-@anchor{anastasis encryption}@anchor{6}
-@subsection Encryption
 
+GNU Taler merchant has these additional dependencies:
 
-For symmetric encryption of data we use AES256-GCM. For this we need a
-symmetric key and an initialization vector (IV).  To ensure that the
-symmetric key changes for each encryption operation, we compute the
-key material using an HKDF over a nonce and the kdf_id.
+
+@itemize -
+
+@item 
+libqrencode >= 4.0.0
+@end itemize
+
+The following steps assume all dependencies are installed.
+
+First, unpack the GNU Taler merchant tarball and change into
+the resulting directory.
+Then, use the following commands to build and install the merchant backend:
 
 @example
-(iv,key) := HKDF(kdf_id, nonce, keysize + ivsize)
+$ ./configure [--prefix=PFX] \
+              [--with-gnunet=GNUNETPFX] \
+              [--with-exchange=EXCHANGEPFX]
+$ # Each dependency can be fetched from non standard locations via
+$ # the '--with-<LIBNAME>' option. See './configure --help'.
+$ make
+# make install
 @end example
 
-@strong{HKDF()}: The HKDF-function uses two phases: First we use HMAC-SHA512 
for the extraction phase, then HMAC-SHA256 is used for expansion phase.
-
-@strong{kdf_id}: Hashed identifier.
+If you did not specify a prefix, the exchange will install to
+@code{/usr/local}, which requires you to run the last step as @code{root}.
 
-@strong{keysize}: Size of the AES symmetric key, here 32 bytes.
+You have to specify @code{--with-exchange=/usr/local} and/or
+@code{--with-gnunet=/usr/local} if you installed the exchange and/or
+GNUnet to @code{/usr/local} in the previous steps.
 
-@strong{ivsize}: Size of the AES GCM IV, here 12 bytes.
+Depending on the prefixes you specified for the installation and the
+distribution you are using, you may have to edit @code{/etc/ld.so.conf}, adding
+lines for @code{GNUNETPFX/lib/} and @code{EXCHANGEPFX/lib/} and @code{PFX/lib/}
+(replace the prefixes with the actual paths you used). Afterwards, you should
+run @code{ldconfig}. Without this step, it is possible that the linker may not
+find the installed libraries and launching the Taler merchant backend would
+then fail.
 
-@strong{prekey}: Original key material.
+@node Installing Anastasis,Installing GNUnet-gtk,Installing the Taler 
Merchant,Installing from source
+@anchor{installation installing-anastasis}@anchor{b}
+@subsubsection Installing Anastasis
 
-@strong{nonce}: 32-byte nonce, must never match “ver” (which it cannot as the 
length is different). Of course, we must
-avoid key reuse. So, we have to use different nonces to get different keys and 
IVs (see below).
 
-@strong{key}: Symmetric key which is later used to encrypt the documents with 
AES256-GCM.
+The following steps assume all dependencies are installed.
 
-@strong{iv}: IV which will be used for AES-GCM.
+First, unpack the Anastasis tarball and change into
+the resulting directory.
+Then, use the following commands to build and install Anastasis:
 
-@node Key Usage,Availability Considerations,Key derivations,Anastasis 
Cryptography
-@anchor{anastasis key-usage}@anchor{7}
-@section Key Usage
+@example
+$ ./configure [--prefix=PFX] \
+              [--with-gnunet=GNUNETPFX] \
+              [--with-exchange=EXCHANGEPFX]
+$ # Each dependency can be fetched from non standard locations via
+$ # the '--with-<LIBNAME>' option. See './configure --help'.
+$ make
+# make install
+@end example
 
+If you did not specify a prefix, Anastasis will be installed to
+@code{/usr/local}, which requires you to run the last step as @code{root}.
 
-The keys we have generated are then used to encrypt the @strong{recovery 
document} and
-the @strong{key_share} of the user.
+You have to specify @code{--with-exchange=/usr/local} and/or
+@code{--with-gnunet=/usr/local} if you installed the exchange and/or
+GNUnet to @code{/usr/local} in the previous steps.
 
-@menu
-* Encryption: Encryption<2>.
-* Signatures::
+Depending on the prefixes you specified for the installation and the
+distribution you are using, you may have to edit @code{/etc/ld.so.conf}, adding
+lines for @code{GNUNETPFX/lib/} and @code{EXCHANGEPFX/lib/} and @code{PFX/lib/}
+(replace the prefixes with the actual paths you used). Afterwards, you should
+run @code{ldconfig}. Without this step, it is possible that the linker may not
+find the installed libraries and launching the Anastasis backend would
+then fail.
 
-@end menu
+@node Installing GNUnet-gtk,Installing Anastasis-gtk,Installing 
Anastasis,Installing from source
+@anchor{installation installing-gnunet-gtk}@anchor{c}
+@subsubsection Installing GNUnet-gtk
 
-@node Encryption<2>,Signatures,,Key Usage
-@anchor{anastasis id1}@anchor{8}
-@subsection Encryption
 
+The following steps assume at least the GNUnet and Gtk+ dependencies are 
installed.
 
-Before every encryption a 32-byte nonce is generated.
-From this the symmetric key is computed as described above.
-We use AES256-GCM for the encryption of the @strong{recovery document} and
-the @strong{key_share}.  To ensure that the key derivation for the encryption
-of the @strong{recovery document} differs fundamentally from that of an
-individual @strong{key share}, we use different salts (“erd” and “eks” 
respectively).
+First, unpack the gnunet-gtk tarball and change into the resulting directory.
+Then, use the following commands to build and install gnunet-gtk:
 
 @example
-(iv0, key0) = HKDF(key_id, nonce0, "erd", keysize + ivsize)
-(encrypted_recovery_document, aes_gcm_tag) = AES256_GCM(recovery_document, 
key0, iv0)
-(iv_i, key_i) = HKDF(key_id, nonce_i, "eks", [optional data], keysize + ivsize)
-(encrypted_key_share_i, aes_gcm_tag_i) = AES256_GCM(key_share_i, key_i, iv_i)
+$ ./configure [--prefix=$PFX] \
+              [--with-gnunet=$GNUNETPFX]
+$ # Each dependency can be fetched from non standard locations via
+$ # the '--with-<LIBNAME>' option. See './configure --help'.
+$ make
+# make install
 @end example
 
-@strong{encrypted_recovery_document}: The encrypted @strong{recovery document} 
which contains the escrow methods, policies
-and the encrypted @strong{core secret}.
+It is highly recommended to use the same prefix ($PFX) for gnunet-gtk that was
+used for GNUnet ($GNUNETPFX).  If you did not specify a prefix, gnunet-gtk
+will be installed to @code{/usr/local}, which requires you to run the last step
+as @code{root}.
 
-@strong{nonce0}: Nonce which is used to generate @emph{key0} and @emph{iv0} 
which are used for the encryption of the @emph{recovery document}.
-Nonce must contain the string “ERD”.
+You have to specify @code{--with-gnunet=/usr/local} if you installed
+GNUnet to @code{/usr/local} in the previous steps.
 
-@strong{optional data}: Key material that optionally is contributed from the 
authentication method to further obfuscate the key share from the escrow 
provider.
+Depending on the prefixes you specified for the installation and the
+distribution you are using, you may have to edit @code{/etc/ld.so.conf}, adding
+lines for @code{$GNUNETPFX/lib/} and @code{$PFX/lib/} (replace the prefixes 
with the
+actual paths you used). Afterwards, you should run @code{ldconfig}. Without 
this
+step, it is possible that the linker may not find the installed libraries and
+launching gnunet-gtk would then fail.
 
-@strong{encrypted_key_share_i}: The encrypted @strong{key_share} which the 
escrow provider must release upon successful authentication.
-Here, @strong{i} must be a positive number used to iterate over the various 
@strong{key shares} used for the various @strong{escrow methods}
-at the various providers.
+@node Installing Anastasis-gtk,,Installing GNUnet-gtk,Installing from source
+@anchor{installation installing-anastasis-gtk}@anchor{d}
+@subsubsection Installing Anastasis-gtk
 
-@strong{nonce_i}: Nonce which is used to generate @emph{key_i} and @emph{iv_i} 
which are used for the encryption of the @strong{key share}. @strong{i} must be
-the same number as specified above for @emph{encrypted_key_share_i}. Nonce 
must contain the string “EKS” plus the according @emph{i}.
 
-As a special rule, when a @strong{security question} is used to authorize 
access to an
-@strong{encrypted_key_share_i}, then the salt “eks” is replaced with an 
(expensive) hash
-of the answer to the security question as an additional way to make the key 
share
-inaccessible to those who do not have the answer:
+The following steps assume at least the GNUnet, gnunet-gtk and Anastasis
+dependencies are installed.
+
+First, unpack the anastasis-gtk tarball and change into the resulting
+directory.  Then, use the following commands to build and install
+anastasis-gtk:
 
 @example
-powh = POW_HASH (qsalt, answer)
-ekss = HKDF("Anastasis-secure-question-uuid-salting",
-            powh,
-            uuid);
-(iv_i, key_i) = HKDF(key_id, nonce_i, ekss, [optional data], keysize + ivsize)
+$ ./configure [--prefix=PFX] \
+              [--with-gnunet=GNUNETPFX] \
+              [--with-exchange=EXCHANGEPFX] \
+              [--with-anastasis=ANASTASISPFX]
+$ # Each dependency can be fetched from non standard locations via
+$ # the '--with-<LIBNAME>' option. See './configure --help'.
+$ make
+# make install
 @end example
 
-@strong{qsalt}: salt value used to hash answer to satisfy the challenge to 
prevent the provider from determining the answer via guessing.
+If you did not specify a prefix, anastasis-gtk will be installed to
+@code{/usr/local}, which requires you to run the last step as @code{root}.
 
-@strong{answer}: answer to the security question, in UTF-8, as entered by the 
user.
+You have to specify @code{-with-anastasis=/usr/local}, 
@code{--with-exchange=/usr/local} and/or
+@code{--with-gnunet=/usr/local} if you installed the exchange and/or
+GNUnet to @code{/usr/local} in the previous steps.
 
-@strong{powh}: result of the (expensive, proof-of-work) hash algorithm.
+Depending on the prefixes you specified for the installation and the
+distribution you are using, you may have to edit @code{/etc/ld.so.conf}, adding
+lines for @code{GNUNETPFX/lib/} and @code{EXCHANGEPFX/lib/} and @code{PFX/lib/}
+(replace the prefixes with the actual paths you used). Afterwards, you should
+run @code{ldconfig}. Without this step, it is possible that the linker may not
+find the installed libraries and launching anastasis-gtk would then fail.
 
-@strong{uuid}: UUID of the challenge associated with the security question and 
the encrypted key share.
+@node Installing Anastasis binary packages on Debian,Installing Anastasis 
binary packages on Ubuntu,Installing from source,Installation
+@anchor{installation installing-anastasis-binary-packages-on-debian}@anchor{e}
+@subsection Installing Anastasis binary packages on Debian
 
-@strong{ekss}: Replacement salt to be used instead of “eks” when deriving the 
key to encrypt/decrypt the key share.
 
-@node Signatures,,Encryption<2>,Key Usage
-@anchor{anastasis signatures}@anchor{9}
-@subsection Signatures
+To install the GNU Taler Debian packages, first ensure that you have
+the right Debian distribution. At this time, the packages are built for
+Sid, which means you should use a system which at least includes
+unstable packages in its source list.  We recommend using APT pinning
+to limit unstable packages to those explicitly requested. To do this,
+set your @code{/etc/apt/preferences} as follows:
 
+@example
+Package: *
+Pin: release a=stable
+Pin-Priority: 700
 
-The EdDSA keys are used to sign the data sent from the client to the
-server. Everything the client sends to server is signed. The following
-algorithm is equivalent for @strong{Anastasis-Policy-Signature}.
+Package: *
+Pin: release a=testing
+Pin-Priority: 650
 
-@example
-(anastasis-account-signature) = eddsa_sign(h_body, eddsa_priv)
-ver_res = eddsa_verifiy(h_body, anastasis-account-signature, eddsa_pub)
+Package: *
+Pin: release a=unstable
+Pin-Priority: 600
+
+Package: *
+Pin: release l=Debian-Security
+Pin-Priority: 1000
 @end example
 
-@strong{anastasis-account-signature}: Signature over the SHA-512 hash of the 
body using the purpose code @code{TALER_SIGNATURE_ANASTASIS_POLICY_UPLOAD} 
(1400) (see GNUnet EdDSA signature API for the use of purpose).
+A typical @code{/etc/apt/sources.list} file for this setup
+which combines Debian stable with more recent packages
+from testing and unstable would look like this:
 
-@strong{h_body}: The hashed body.
+@example
+deb http://ftp.ch.debian.org/debian/ buster main
+deb http://security.debian.org/debian-security buster/updates main
+deb http://ftp.ch.debian.org/debian/ testing main
+deb http://ftp.ch.debian.org/debian/ unstable main
+@end example
 
-@strong{ver_res}: A boolean value. True: Signature verification passed, False: 
Signature verification failed.
+Naturally, you may want to use different mirrors depending on your region.
+Additionally, you must add a file to import the GNU Taler packages. Typically,
+this is done by adding a file @code{/etc/apt/sources.list.d/taler.list} that
+looks like this:
 
-When requesting policy downloads, the client must also provide a signature:
+@example
+deb https://deb.taler.net/apt/debian sid main
+@end example
+
+Next, you must import the Taler Systems SA public package signing key
+into your keyring and update the package lists:
 
 @example
-(anastasis-account-signature) = eddsa_sign(version, eddsa_priv)
-ver_res = eddsa_verifiy(version, anastasis-account-signature, eddsa_pub)
+# wget -O - https://taler.net/taler-systems.gpg.key | apt-key add -
+# apt update
 @end example
 
-@strong{anastasis-account-signature}: Signature over the SHA-512 hash of the 
body using the purpose code @code{TALER_SIGNATURE_ANASTASIS_POLICY_DOWNLOAD} 
(1401) (see GNUnet EdDSA signature API for the use of purpose).
+@cartouche
+@quotation Note 
+You may want to verify the correctness of the Taler Systems key out-of-band.
+@end quotation
+@end cartouche
 
-@strong{version}: The version requested as a 64-bit integer, 2^64-1 for the 
“latest version”.
+Now your system is ready to install the official GNU Taler binary packages
+using apt.
 
-@strong{ver_res}: A boolean value. True: Signature verification passed, False: 
Signature verification failed.
+@menu
+* Installing the graphical front-end:: 
+* Installing the backend:: 
 
-@node Availability Considerations,,Key Usage,Anastasis Cryptography
-@anchor{anastasis availability-considerations}@anchor{a}
-@section Availability Considerations
+@end menu
 
+@node Installing the graphical front-end,Installing the backend,,Installing 
Anastasis binary packages on Debian
+@anchor{installation installing-the-graphical-front-end}@anchor{f}
+@subsubsection Installing the graphical front-end
 
-Anastasis considers two main threats against availability. First, the
-Anastasis server operators must be protected against denial-of-service attacks
-where an adversary attempts to exhaust the operator’s resources.  The API 
protects
-against these attacks by allowing operators to set fees for all
-operations. Furthermore, all data stored comes with an expiration logic, so an
-attacker cannot force servers to store data indefinitely.
-
-A second availability issue arises from strong adversaries that may be able to
-compute the account keys of some user.  While we assume that such an adversary
-cannot successfully authenticate against the truth, the account key does
-inherently enable these adversaries to upload a new policy for the account.
-This cannot be prevented, as the legitimate user must be able to set or change
-a policy using only the account key.  To ensure that an adversary cannot
-exploit this, policy uploads first of all never delete existing policies, but
-merely create another version.  This way, even if an adversary uploads a
-malicious policy, a user can still retrieve an older version of the policy to
-recover access to their data.  This append-only storage for policies still
-leaves a strong adversary with the option of uploading many policies to
-exhaust the Anastasis server’s capacity.  We limit this attack by requiring a
-policy upload to include a reference to a @strong{payment identifier} from a 
payment
-made by the user.  Thus, a policy upload requires both knowledge of the
-@strong{identity} and making a payment.  This effectively prevents and 
adversary
-from using the append-only policy storage from exhausting Anastasis server
-capacity.
-
-@node Anastasis REST API,Anastasis Reducer API,Anastasis Cryptography,Top
-@anchor{anastasis anastasis-rest-api}@anchor{b}
-@chapter Anastasis REST API
 
-@anchor{anastasis salt}@anchor{c}
-@menu
-* Receiving Configuration::
-* Receiving Terms of Service::
-* Manage policy::
-* Managing truth::
+To install the Anastasis Gtk+ frontend, you can simply run:
 
-@end menu
+@example
+# apt install anastasis-gtk
+@end example
 
-@node Receiving Configuration,Receiving Terms of Service,,Anastasis REST API
-@anchor{anastasis config}@anchor{d}@anchor{anastasis 
receiving-configuration}@anchor{e}
-@section Receiving Configuration
+To use @code{anastasis-gtk}, you can simply run:
 
+@example
+$ anastasis-gtk
+@end example
 
-@anchor{anastasis get--config}@anchor{f}
-@deffn {HTTP Get} GET /config
+@node Installing the backend,,Installing the graphical front-end,Installing 
Anastasis binary packages on Debian
+@anchor{installation installing-the-backend}@anchor{10}
+@subsubsection Installing the backend
 
-Obtain the configuration details of the escrow provider.
 
-@strong{Response:}
+If you want to install the Anastasis backend-end (which normal users do not
+need), you should run:
 
-Returns an @ref{10,,EscrowConfigurationResponse}.
-@anchor{anastasis escrowconfigurationresponse}@anchor{10}
 @example
-interface EscrowConfigurationResponse @{
-
-  // Protocol identifier, clarifies that this is an Anastasis provider.
-  name: "anastasis";
+# apt install -t sid anastasis-httpd
+@end example
 
-  // libtool-style representation of the Exchange protocol version, see
-  // 
https://www.gnu.org/software/libtool/manual/html_node/Versioning.html#Versioning
-  // The format is "current:revision:age".
-  version: string;
+Note that the latter package does not perform all of the configuration work.
+It does setup the user users and the systemd service scripts, but you still
+must configure the database backup, HTTP reverse proxy (typically with TLS
+certificates), Taler merchant backend for payments, authentication services,
+prices and the terms of service.
 
-  // Currency in which this provider processes payments.
-  currency: string;
+Sample configuration files for the HTTP reverse proxy can be found in
+@code{/etc/anastasis.conf}.
 
-  // supported authorization methods
-  methods: AuthorizationMethodConfig[];
+Note that the package does not complete the integration of the backend
+with the HTTP reverse proxy (typically with TLS certificates).  A
+configuration fragment for Nginx or Apache will be placed in
+@code{/etc/@{apache,nginx@}/conf-available/anastasis.conf}.
 
-  // maximum policy upload size supported
-  storage_limit_in_megabytes: number;
+To operate an Anastasis backend with payments, you additionally
+need to install a Taler merchant backend via:
 
-  // Payment required to maintain an account to store policy documents for a 
year.
-  // Users can pay more, in which case the storage time will go up 
proportionally.
-  annual_fee: Amount;
+@example
+# apt install -t sid taler-merchant-httpd
+@end example
 
-  // Payment required to upload truth.  To be paid per upload.
-  truth_upload_fee: Amount;
+@node Installing Anastasis binary packages on Ubuntu,,Installing Anastasis 
binary packages on Debian,Installation
+@anchor{installation installing-anastasis-binary-packages-on-ubuntu}@anchor{11}
+@subsection Installing Anastasis binary packages on Ubuntu
 
-  // how long until the service expires deposited truth
-  // (unless refreshed via another POST)?
-  truth_lifetime: RelativeTime;
 
-  // Limit on the liability that the provider is offering with
-  // respect to the services provided.
-  liability_limit: Amount;
+To install the GNU Taler Ubuntu packages, first ensure that you have
+the right Ubuntu distribution. At this time, the packages are built for
+Ubuntu 20.04 LTS (Focal Fossa).
 
-  // salt value with 128 bits of entropy
-  // Different providers
-  // will use different high-entropy salt values. The resulting
-  // **provider salt** is then used in various operations to ensure
-  // cryptographic operations differ by provider.  A provider must
-  // never change its salt value.
-  server_salt: string;
+A typical @code{/etc/apt/sources.list.d/taler.list} file for this setup
+would look like this:
 
-@}
-@end example
-@anchor{anastasis authorizationmethodconfig}@anchor{11}
 @example
-interface AuthorizationMethodConfig @{
-  // name of the authorization method
-  type: string;
+deb https://deb.taler.net/apt/ubuntu/ focal-fossa main
+@end example
 
-  // Fee for accessing key share using this method
-  cost: Amount;
+The last line is crucial, as it adds the GNU Taler packages.
 
-@}
-@end example
-@end deffn
+Next, you must import the Taler Systems SA public package signing key
+into your keyring and update the package lists:
 
-@node Receiving Terms of Service,Manage policy,Receiving 
Configuration,Anastasis REST API
-@anchor{anastasis receiving-terms-of-service}@anchor{12}@anchor{anastasis 
terms}@anchor{13}
-@section Receiving Terms of Service
+@example
+# wget -O - https://taler.net/taler-systems.gpg.key | apt-key add -
+# apt update
+@end example
 
+@cartouche
+@quotation Note 
+You may want to verify the correctness of the Taler Systems key out-of-band.
+@end quotation
+@end cartouche
 
-@anchor{anastasis get--terms}@anchor{14}
-@deffn {HTTP Get} GET /terms
+Now your system is ready to install the official GNU Taler binary packages
+using apt.
 
-Obtain the terms of service provided by the escrow provider.
+@menu
+* Installing the graphical front-end: Installing the graphical front-end<2>. 
+* Installing the backend: Installing the backend<2>. 
 
-@strong{Response:}
+@end menu
 
-Returns the terms of service of the provider, in the best language
-and format available based on the client’s request.
-@end deffn
+@node Installing the graphical front-end<2>,Installing the 
backend<2>,,Installing Anastasis binary packages on Ubuntu
+@anchor{installation id1}@anchor{12}
+@subsubsection Installing the graphical front-end
 
-@anchor{anastasis get--privacy}@anchor{15}
-@deffn {HTTP Get} GET /privacy
 
-Obtain the privacy poliy of the service provided by the escrow provider.
+To install the Anastasis front-end, you can now simply run:
 
-@strong{Response:}
+@example
+# apt install -t focal-fossa anastasis-gtk
+@end example
 
-Returns the privacy policy of the provider, in the best language
-and format available based on the client’s request.
-@end deffn
+To use @code{anastasis-gtk}, you can simply run:
 
-@node Manage policy,Managing truth,Receiving Terms of Service,Anastasis REST 
API
-@anchor{anastasis id2}@anchor{16}@anchor{anastasis manage-policy}@anchor{17}
-@section Manage policy
+@example
+$ anastasis-gtk
+@end example
 
+@node Installing the backend<2>,,Installing the graphical 
front-end<2>,Installing Anastasis binary packages on Ubuntu
+@anchor{installation id2}@anchor{13}
+@subsubsection Installing the backend
 
-This API is used by the Anastasis client to deposit or request encrypted
-recovery documents with the escrow provider.  Generally, a client will deposit
-the same encrypted recovery document with each escrow provider, but provide
-a different truth to each escrow provider.
 
-Operations by the client are identified and authorized by @code{$ACCOUNT_PUB}, 
which
-should be kept secret from third parties. @code{$ACCOUNT_PUB} should be an 
account
-public key using the Crockford base32-encoding.
+If you want to install the Anastasis backend-end (which normal users do not
+need), you should run:
 
-In the following, UUID is always defined and used according to RFC 
4122@footnote{https://tools.ietf.org/html/rfc4122}.
+@example
+# apt install -t focal-fossa anastasis-httpd
+@end example
 
-@anchor{anastasis get--policy-$ACCOUNT_PUB[?version=$NUMBER]}@anchor{18}
-@deffn {HTTP Get} GET /policy/$ACCOUNT_PUB[?version=$NUMBER]
+Note that the latter package does not perform all of the configuration work.
+It does setup the user users and the systemd service scripts, but you still
+must configure the database backup, HTTP reverse proxy (typically with TLS
+certificates), Taler merchant backend for payments, authentication services,
+prices and the terms of service.
 
-Get the customer’s encrypted recovery document.  If “version”
-is not specified, the server returns the latest available version.  If
-“version” is specified, returns the policy with the respective
-“version”.  The response must begin with the nonce and
-an AES-GCM tag and continue with the ciphertext.  Once decrypted, the
-plaintext is expected to contain:
+Sample configuration files for the HTTP reverse proxy can be found in
+@code{/etc/anastasis.conf}.
 
+To operate an Anastasis backend with payments, you additionally
+need to install a Taler merchant backend via:
 
-@itemize *
+@example
+# apt install -t sid taler-merchant-httpd
+@end example
 
-@item
-the escrow policy
+@c This file is part of Anastasis
+@c Copyright (C) 2019-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero General Public License as published by the Free 
Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
+@c @author Dominik Meister
+@c @author Dennis Neufeld
 
-@item
-the separately encrypted master public key
-@end itemize
+@node Configuration,Cryptography,Installation,Documentation Overview
+@anchor{configuration doc}@anchor{14}@anchor{configuration 
configuration}@anchor{15}
+@section Configuration
 
-Note that the key shares required to decrypt the master public key are
-not included, as for this the client needs to obtain authorization.
-The policy does provide sufficient information for the client to determine
-how to authorize requests for @strong{truth}.
 
-The client MAY provide an “If-None-Match” header with an Etag.
-In that case, the server MUST additionally respond with an “304” status
-code in case the resource matches the provided Etag.
+Details about the contents of the configuration file are describe in
+the @code{anastasis.conf(5)} chapter.  This chapter only describes the
+configuration format.
 
-@strong{Response}:
+@menu
+* Configuration format:: 
+* Using anastasis-config:: 
 
+@end menu
 
-@table @asis
+@node Configuration format,Using anastasis-config,,Configuration
+@anchor{configuration configuration-format}@anchor{16}
+@subsection Configuration format
 
-@item 200 
OK@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.1}:
 
-The escrow provider responds with an @ref{19,,EncryptedRecoveryDocument} 
object.
+In Taler realm, any component obeys to the same pattern to get
+configuration values. According to this pattern, once the component has
+been installed, the installation deploys default values in
+$@{prefix@}/share/taler/config.d/, in .conf files. In order to override
+these defaults, the user can write a custom .conf file and either pass
+it to the component at execution time, or name it taler.conf and place
+it under $HOME/.config/.
 
-@item 304 Not 
modified@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5}:
+A config file is a text file containing sections, and each section
+contains its values. The right format follows:
 
-The client requested the same resource it already knows.
+@example
+[section1]
+value1 = string
+value2 = 23
 
-@item 400 Bad 
request@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1}:
+[section2]
+value21 = string
+value22 = /path22
+@end example
 
-The $ACCOUNT_PUB is not an EdDSA public key.
+Throughout any configuration file, it is possible to use @code{$}-prefixed
+variables, like @code{$VAR}, especially when they represent filesystem
+paths. It is also possible to provide defaults values for those
+variables that are unset, by using the following syntax:
+@code{$@{VAR:-default@}}. However, there are two ways a user can set
+@code{$}-prefixable variables:
 
-@item 402 Payment 
Required@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.3}:
+by defining them under a @code{[paths]} section, see example below,
 
-The account’s balance is too low for the specified operation.
-See the Taler payment protocol specification for how to pay.
+@example
+[paths]
+TALER_DEPLOYMENT_SHARED = $@{HOME@}/shared-data
+..
+[section-x]
+path-x = $@{TALER_DEPLOYMENT_SHARED@}/x
+@end example
 
-@item 403 
Forbidden@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.4}:
+or by setting them in the environment:
 
-The required account signature was invalid.
+@example
+$ export VAR=/x
+@end example
 
-@item 404 Not 
found@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.5}:
+The configuration loader will give precedence to variables set under
+@code{[path]}, though.
 
-The requested resource was not found.
-@end table
+The utility @code{taler-config}, which gets installed along with the
+exchange, serves to get and set configuration values without directly
+editing the .conf. The option @code{-f} is particularly useful to resolve
+pathnames, when they use several levels of @code{$}-expanded variables. See
+@code{taler-config --help}.
 
-@emph{Anastasis-Version}: $NUMBER — The server must return actual version of 
the encrypted recovery document via this header.
-If the client specified a version number in the header of the request, the 
server must return that version. If the client
-did not specify a version in the request, the server returns latest version of 
the @ref{19,,EncryptedRecoveryDocument}.
+Note that, in this stage of development, the file
+@code{$HOME/.config/taler.conf} can contain sections for @emph{all} the
+component. For example, both an exchange and a bank can read values from
+it.
 
-@emph{Etag}: Set by the server to the Base32-encoded SHA512 hash of the body. 
Used for caching and to prevent redundancies. The server MUST send the Etag if 
the status code is 200 OK.
+The repository @code{git://taler.net/deployment} contains examples of
+configuration file used in our demos. See under @code{deployment/config}.
 
-@emph{If-None-Match}: If this is not the very first request of the client, 
this contains the Etag-value which the client has received before from the 
server.
-The client SHOULD send this header with every request (except for the first 
request) to avoid unnecessary downloads.
+@quotation
 
-@emph{Anastasis-Account-Signature}: The client must provide Base-32 encoded 
EdDSA signature over hash of body with @code{$ACCOUNT_PRIV}, affirming desire 
to download the requested encrypted recovery document.  The purpose used MUST 
be @code{TALER_SIGNATURE_ANASTASIS_POLICY_DOWNLOAD} (1401).
-@end deffn
+@strong{Note}
 
-@anchor{anastasis post--policy-$ACCOUNT_PUB}@anchor{1a}
-@deffn {HTTP Post} POST /policy/$ACCOUNT_PUB
+Expectably, some components will not work just by using default
+values, as their work is often interdependent. For example, a
+merchant needs to know an exchange URL, or a database name.
+@end quotation
 
-Upload a new version of the customer’s encrypted recovery document.
-While the document’s structure is described in JSON below, the upload
-should just be the bytestream of the raw data (i.e. 32-byte nonce followed
-by 16-byte tag followed by the encrypted document).
-If the request has been seen before, the server should do nothing, and 
otherwise store the new version.
-The body must begin with a nonce, an AES-GCM tag and continue with the 
ciphertext.  The format
-is the same as specified for the response of the GET method. The
-Anastasis server cannot fully validate the format, but MAY impose
-minimum and maximum size limits.
+@node Using anastasis-config,,Configuration format,Configuration
+@anchor{configuration using-anastasis-config}@anchor{17}
+@subsection Using anastasis-config
 
-@strong{Request}:
 
-@*Query Parameters:
+The tool @code{anastasis-config} can be used to extract or manipulate
+configuration values; however, the configuration use the well-known INI
+file format and can also be edited by hand.
 
-@itemize *
+Run
 
-@item
-@code{pay} – Optional argument, any non-empty value will do,
-suggested is @code{y} for @code{yes}.
-The client insists on making a payment for the respective
-account, even if this is not yet required. The server
-will respond with a @code{402 Payment required}, but only
-if the rest of the request is well-formed (account
-signature must match).  Clients that do not actually
-intend to make a new upload but that only want to pay
-may attempt to upload the latest backup again, as this
-option will be checked before the @code{304 Not modified}
-case.
+@example
+$ anastasis-config -s $SECTION
+@end example
 
-@item
-@code{timeout_ms=NUMBER} – @emph{Optional.}  If specified, the Anastasis 
server will
-wait up to @code{timeout_ms} milliseconds for completion of the payment before
-sending the HTTP response.  A client must never rely on this behavior, as the
-backend may return a response immediately.
-@end itemize
+to list all of the configuration values in section @code{$SECTION}.
 
+Run
 
-@emph{If-None-Match}: This header MUST be present and set to the SHA512 hash 
(Etag) of the body by the client.
-The client SHOULD also set the “Expect: 100-Continue” header and wait for “100 
continue”
-before uploading the body.  The server MUST
-use the Etag to check whether it already knows the encrypted recovery document 
that is about to be uploaded.
-The server MUST refuse the upload with a “304” status code if the Etag matches
-the latest version already known to the server.
+@example
+$ anastasis-config -s $section -o $option
+@end example
 
-@emph{Anastasis-Policy-Signature}: The client must provide Base-32 encoded 
EdDSA signature over hash of body with @code{$ACCOUNT_PRIV}, affirming desire 
to upload an encrypted recovery document.
+to extract the respective configuration value for option @code{$option} in
+section @code{$section}.
 
-@emph{Payment-Identifier}: Base-32 encoded 32-byte payment identifier that was 
included in a previous payment (see 402 status code). Used to allow the server 
to check that the client paid for the upload (to protect the server against DoS 
attacks) and that the client knows a real secret of financial value (as the 
@strong{kdf_id} might be known to an attacker). If this header is missing in 
the client’s request (or the associated payment has exceeded the upload limit), 
the server must retur [...]
+Finally, to change a setting, run
 
-@strong{Response}:
+@example
+$ anastasis-config -s $section -o $option -V $value
+@end example
 
+to set the respective configuration value to @code{$value}. Note that you
+have to manually restart the Taler backend after you change the
+configuration to make the new configuration go into effect.
 
-@table @asis
+Some default options will use $-variables, such as @code{$DATADIR} within
+their value. To expand the @code{$DATADIR} or other $-variables in the
+configuration, pass the @code{-f} option to @code{anastasis-config}. For 
example,
+compare:
 
-@item 204 No 
content@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.5}:
+@example
+$ anastasis-config -s ACCOUNT-bank \
+               -o WIRE_RESPONSE
+$ anastasis-config -f -s ACCOUNT-bank \
+               -o WIRE_RESPONSE
+@end example
 
-The encrypted recovery document was accepted and stored.  “Anastasis-Version” 
and “Anastasis-UUID” headers
-indicate what version and UUID was assigned to this encrypted recovery 
document upload by the server.
+While the configuration file is typically located at
+@code{$HOME/.config/taler.conf}, an alternative location can be specified
+to @code{taler-merchant-httpd} and @code{anastasis-config} using the @code{-c}
+option.
 
-@item 304 Not 
modified@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5}:
+@c This file is part of Anastasis
+@c Copyright (C) 2019-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero General Public License as published by the Free 
Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
+@c @author Dominik Meister
+@c @author Dennis Neufeld
 
-The same encrypted recovery document was previously accepted and stored.  
“Anastasis-Version” header
-indicates what version was previously assigned to this encrypted recovery 
document.
+@node Cryptography,REST API,Configuration,Documentation Overview
+@anchor{cryptography doc}@anchor{18}@anchor{cryptography 
cryptography}@anchor{19}
+@section Cryptography
 
-@item 400 Bad 
request@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1}:
 
-The @code{$ACCOUNT_PUB} is not an EdDSA public key or mandatory headers are 
missing.
-The response body MUST elaborate on the error using a Taler error code in the 
typical JSON encoding.
+When a user needs to interact with Anastasis, the system first derives some key
+material, but not the master secret, from the user’s @strong{identifier} using
+different HKDFs.  These HKDFs are salted using the respective escrow
+provider’s @strong{server salt}, which ensures that the accounts for the same 
user
+cannot be easily correlated across the various Anastasis servers.
 
-@item 402 Payment 
required@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.3}:
+Each Anastasis server uses an EdDSA @strong{account key} to identify the 
account of
+the user.  The account private key is derived from the user’s 
@strong{identifier} using
+a computationally expensive cryptographic hash function.  Using an
+expensive hash algorithm is assumed to make it infeasible for a weak adversary 
to
+determine account keys by brute force (without knowing the user’s identifier).
+However, it is assumed that a strong adversary performing a targeted attack can
+compute the account key pair.
 
-The account’s balance is too low for the specified operation.
-See the Taler payment protocol specification for how to pay.
-The response body MAY provide alternative means for payment.
+The public account key is Crockford base32-encoded in the URI to identify the
+account, and used to sign requests.  These signatures are also provided in
+base32-encoding and transmitted using the HTTP header
+@code{Anastasis-Account-Signature}.
 
-@item 403 
Forbidden@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.4}:
+When confidential data is uploaded to an Anastasis server, the respective
+payload is encrypted using AES-GCM with a symmetric key and initialization
+vector derived from the @strong{identifier} and a high-entropy @strong{nonce}. 
 The
+nonce and the GCM tag are prepended to the ciphertext before being uploaded to
+the Anastasis server.  This is done whenever confidential data is stored with
+the server.
 
-The required account signature was invalid.  The response body may elaborate 
on the error.
+The @strong{core secret} of the user is (AES) encrypted using a symmetric 
@strong{master
+key}.  Recovering this master key requires the user to satisfy a particular
+@strong{policy}.  Policies specify a set of @strong{escrow methods}, each of 
which leads
+the user to a @strong{key share}. Combining those key shares (by hashing) 
allows
+the user to obtain a @strong{policy key}, which can be used to decrypt the 
@strong{master
+key}.  There can be many policies, satisfying any of these will allow the
+user to recover the master key.  A @strong{recovery document} contains the
+encrypted @strong{core secret}, a set of escrow methods and a set of policies.
 
-@item 413 Request entity too 
large@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.14}:
+@menu
+* Key derivations:: 
+* Key Usage:: 
+* Availability Considerations:: 
 
-The upload is too large @emph{or} too small. The response body may elaborate 
on the error.
-@end table
+@end menu
 
-@strong{Details:}
-@anchor{anastasis encryptedrecoverydocument}@anchor{19}
-@example
-interface EncryptedRecoveryDocument @{
-  // Nonce used to compute the (iv,key) pair for encryption of the
-  // encrypted_compressed_recovery_document.
-  nonce: [32]; //bytearray
+@node Key derivations,Key Usage,,Cryptography
+@anchor{cryptography key-derivations}@anchor{1a}
+@subsection Key derivations
 
-  // Authentication tag
-  aes_gcm_tag: [16]; //bytearray
 
-  // Variable-size encrypted recovery document. After decryption,
-  // this contains a gzip compressed JSON-encoded `RecoveryDocument`.
-  // The nonce of the HKDF for this encryption must include the
-  // string "ERD".
-  encrypted_compressed_recovery_document: []; //bytearray of undefined length
+EdDSA and ECDHE public keys are always points on Curve25519 and represented
+using the standard 256 bit Ed25519 compact format.  The binary representation
+is converted to Crockford Base32 when transmitted inside JSON or as part of
+URLs.
+
+To start, a user provides their private, unique and unforgettable
+@strong{identifier} as a seed to identify their account.  For example, this 
could
+be a social security number together with their full name.  Specifics may
+depend on the cultural context, in this document we will simply refer to this
+information as the @strong{identifier}.
+
+This identifier will be first hashed with Argon2, to provide a @strong{kdf_id}
+which will be used to derive other keys later. The Hash must also include the
+respective @strong{server_salt}. This also ensures that the @strong{kdf_id} is 
different
+on each server. The use of Argon2 and the respective @strong{server_salt} is 
intended
+to make it difficult to brute-force @strong{kdf_id} values and help protect 
the user’s
+privacy. Also this ensures that the @strong{kdf_id}s on every server differs. 
However,
+we do not assume that the @strong{identifier} or the @strong{kdf_id} cannot be
+determined by an adversary performing a targeted attack, as a user’s
+@strong{identifier} is likely to always be known to state actors and may
+likely also be available to other actors.
 
-@}
-@end example
-@anchor{anastasis recoverydocument}@anchor{1b}
 @example
-interface RecoveryDocument @{
-  // Account identifier at backup provider, AES-encrypted with
-  // the (symmetric) master_key, i.e. an URL
-  // https://sync.taler.net/$BACKUP_ID and
-  // a private key to decrypt the backup.  Anastasis is oblivious
-  // to the details of how this is ultimately encoded.
-  backup_account: []; //bytearray of undefined length
+kdf_id := Argon2( identifier, server_salt, keysize )
+@end example
 
-  // List of escrow providers and selected authentication method
-  methods: EscrowMethod[];
+@strong{identifier}: The secret defined from the user beforehand.
 
-  // List of possible decryption policies
-  policy: DecryptionPolicy[];
+@strong{server_salt}: The salt from the Server.
 
-@}
-@end example
-@anchor{anastasis escrowmethod}@anchor{1c}
-@example
-interface EscrowMethod @{
-  // URL of the escrow provider (including possibly this Anastasis server)
-  provider_url : string;
+@strong{keysize}: The desired output size of the KDF, here 32 bytes.
 
-  // Type of the escrow method (e.g. security question, SMS etc.)
-  escrow_type: string;
+@menu
+* Verification:: 
+* Encryption:: 
 
-  // UUID of the escrow method (see /truth/ API below).
-  uuid: string;
+@end menu
 
-  // Key used to encrypt the `Truth` this `EscrowMethod` is related to.
-  // Client has to provide this key to the server when using /truth/
-  truth_encryption_key: [32]; //bytearray
+@node Verification,Encryption,,Key derivations
+@anchor{cryptography verification}@anchor{1b}
+@subsubsection Verification
 
-  // Salt used to encrypt the truth on the Anastasis server.
-  truth_salt: [32]; //bytearray
 
-  // The challenge to give to the user (i.e. the security question
-  // if this is challenge-response).
-  // (Q: as string in base32 encoding?)
-  // (Q: what is the mime-type of this value?)
-  //
-  // For some methods, this value may be absent.
-  //
-  // The plaintext challenge is not revealed to the
-  // Anastasis server.
-  challenge: []; //bytearray of undefined length
+For users to authorize “policy” operations we need an EdDSA key pair.  As we
+cannot assure that the corresponding private key is truly secret, such policy
+operations must never be destructive: Should an adversary learn the private
+key, they could access (and with the @strong{kdf_id}, decrypt) the user’s 
policy (but
+not the core secret), or upload a new version of the
+@strong{encrypted recovery document} (but not delete an existing version).
+
+For the generation of the private key we use the @strong{kdf_id} as the 
entropy source,
+hash it to derive a base secret which will then be processed to fit the
+requirements for EdDSA private keys.  From the private key we can then
+generate the corresponding public key.  Here, “ver” is used as a salt for the
+HKDF to ensure that the result differs from other cases where we hash
+@strong{kdf_id}.
 
-@}
-@end example
-@anchor{anastasis decryptionpolicy}@anchor{1d}
 @example
-interface DecryptionPolicy @{
-  // Salt included to encrypt master key share when
-  // using this decryption policy.
-  policy_salt: [32]; //bytearray
+ver_secret := HKDF(kdf_id, "ver", keysize)
+eddsa_priv := eddsa_d_to_a(ver_secret)
+eddsa_pub := get_EdDSA_Pub(eddsa_priv)
+@end example
 
-  // Master key, AES-encrypted with key derived from
-  // salt and keyshares revealed by the following list of
-  // escrow methods identified by UUID.
-  encrypted_master_key: [32]; //bytearray
+@strong{HKDF()}: The HKDF-function uses two phases: First we use HMAC-SHA512 
for the extraction phase, then HMAC-SHA256 is used for expansion phase.
 
-  // List of escrow methods identified by their uuid.
-  uuid: string[];
+@strong{kdf_id}: Hashed identifier.
 
-@}
-@end example
-@end deffn
+@strong{key_size}: Size of the output, here 32 bytes.
 
-@node Managing truth,,Manage policy,Anastasis REST API
-@anchor{anastasis managing-truth}@anchor{1e}@anchor{anastasis truth}@anchor{1f}
-@section Managing truth
+@strong{ver_secret}: Derived key from the @code{kdf_id}, serves as 
intermediate step for the generation of the private key.
 
+@strong{eddsa_d_to_a()}: Function which converts the ver_key to a valid EdDSA 
private key. Specifically, assuming the value @code{eddsa_priv} is in a 32-byte 
array “digest”, the function clears and sets certain bits as follows:
 
-This API is used by the Anastasis client to deposit @strong{truth} or request 
a (encrypted) @strong{key share} with
-the escrow provider.
+@example
+digest[0] = (digest[0] & 0x7f) | 0x40;
+digest[31] &= 0xf8;
+@end example
 
-An @strong{escrow method} specifies an Anastasis provider and how the user 
should
-authorize themself.  The @strong{truth} API allows the user to provide the
-(encrypted) key share to the respective escrow provider, as well as auxiliary
-data required for such a respective escrow method.
+@strong{eddsa_priv}: The generated EdDSA private key.
 
-An Anastasis-server may store truth for free for a certain time period, or
-charge per truth operation using GNU Taler.
+@strong{eddsa_pub}: The generated EdDSA public key.
 
-@anchor{anastasis post--truth-$UUID}@anchor{20}
-@deffn {HTTP Post} POST /truth/$UUID
+@node Encryption,,Verification,Key derivations
+@anchor{cryptography encryption}@anchor{1c}
+@subsubsection Encryption
 
-Upload a @ref{21,,TruthUploadRequest}-Object according to the policy the 
client created before (see @ref{1b,,RecoveryDocument}).
-If request has been seen before, the server should do nothing, and otherwise 
store the new object.
 
-@strong{Request:}
+For symmetric encryption of data we use AES256-GCM. For this we need a
+symmetric key and an initialization vector (IV).  To ensure that the
+symmetric key changes for each encryption operation, we compute the
+key material using an HKDF over a @code{nonce} and the @code{kdf_id}.
 
-@*Query Parameters:
+@example
+(iv,key) := HKDF(kdf_id, nonce, keysize + ivsize)
+@end example
 
-@itemize *
+@strong{HKDF()}: The HKDF-function uses two phases: First we use HMAC-SHA512 
for the extraction phase, then HMAC-SHA256 is used for expansion phase.
 
-@item
-@code{timeout_ms=NUMBER} – @emph{Optional.}  If specified, the Anastasis 
server will
-wait up to @code{timeout_ms} milliseconds for completion of the payment before
-sending the HTTP response.  A client must never rely on this behavior, as the
-backend may return a response immediately.
-@end itemize
+@strong{kdf_id}: Hashed identifier.
 
+@strong{keysize}: Size of the AES symmetric key, here 32 bytes.
 
-@strong{Response:}
+@strong{ivsize}: Size of the AES GCM IV, here 12 bytes.
 
+@strong{prekey}: Original key material.
 
-@table @asis
+@strong{nonce}: 32-byte nonce, must never match “ver” (which it cannot as the 
length is different). Of course, we must
+avoid key reuse. So, we have to use different nonces to get different keys and 
IVs (see below).
 
-@item 204 No 
content@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.5}:
+@strong{key}: Symmetric key which is later used to encrypt the documents with 
AES256-GCM.
 
-Truth stored successfully.
+@strong{iv}: IV which will be used for AES-GCM.
 
-@item 304 Not 
modified@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5}:
+@node Key Usage,Availability Considerations,Key derivations,Cryptography
+@anchor{cryptography key-usage}@anchor{1d}
+@subsection Key Usage
 
-The same truth was previously accepted and stored under this UUID.  The
-Anastasis server must still update the expiration time for the truth when 
returning
-this response code.
 
-@item 402 Payment 
required@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.3}:
+The keys we have generated are then used to encrypt the @strong{recovery 
document} and
+the @strong{key_share} of the user.
 
-This server requires payment to store truth per item.
-See the Taler payment protocol specification for how to pay.
-The response body MAY provide alternative means for payment.
+@menu
+* Encryption: Encryption<2>. 
+* Signatures:: 
 
-@item 409 
Conflict@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.10}:
+@end menu
 
-The server already has some truth stored under this UUID. The client should 
check that it
-is generating UUIDs with enough entropy.
+@node Encryption<2>,Signatures,,Key Usage
+@anchor{cryptography id1}@anchor{1e}
+@subsubsection Encryption
 
-@item 412 Precondition 
failed@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.13}:
 
-The selected authentication method is not supported on this provider.
-@end table
+Before every encryption a 32-byte nonce is generated.
+From this the symmetric key is computed as described above.
+We use AES256-GCM for the encryption of the @strong{recovery document} and
+the @strong{key_share}.  To ensure that the key derivation for the encryption
+of the @strong{recovery document} differs fundamentally from that of an
+individual @strong{key share}, we use different salts (“erd” and “eks”, 
respectively).
 
-@strong{Details:}
-@anchor{anastasis truthuploadrequest}@anchor{21}
 @example
-interface TruthUploadRequest @{
-  // Contains the information of an interface `EncryptedKeyShare`, but simply
-  // as one binary block (in Crockford Base32 encoding for JSON).
-  key_share_data: []; //bytearray
+(iv0, key0) := HKDF(key_id, nonce0, "erd", keysize + ivsize)
+(encrypted_recovery_document, aes_gcm_tag) := AES256_GCM(recovery_document, 
key0, iv0)
+(iv_i, key_i) := HKDF(key_id, nonce_i, "eks", [optional data], keysize + 
ivsize)
+(encrypted_key_share_i, aes_gcm_tag_i) := AES256_GCM(key_share_i, key_i, iv_i)
+@end example
 
-  // Key share method, i.e. "security question", "SMS", "e-mail", ...
-  type: string;
+@strong{encrypted_recovery_document}: The encrypted @strong{recovery document} 
which contains the escrow methods, policies
+and the encrypted @strong{core secret}.
 
-  // Nonce used to compute the (iv,key) pair for encryption of the
-  // encrypted_truth.
-  nonce: [32]; //bytearray
+@strong{nonce0}: Nonce which is used to generate @emph{key0} and @emph{iv0} 
which are used for the encryption of the @emph{recovery document}.
+Nonce must contain the string “ERD”.
 
-  // Authentication tag of encrypted_truth
-  aes_gcm_tag: [16]; //bytearray
+@strong{optional data}: Key material that optionally is contributed from the 
authentication method to further obfuscate the key share from the escrow 
provider.
 
-  // Variable-size truth. After decryption,
-  // this contains the ground truth, i.e. H(challenge answer),
-  // phone number, e-mail address, picture, fingerprint, ...
-  // **base32 encoded**.
-  //
-  // The nonce of the HKDF for this encryption must include the
-  // string "ECT".
-  encrypted_truth: [80]; //bytearray
+@strong{encrypted_key_share_i}: The encrypted @strong{key_share} which the 
escrow provider must release upon successful authentication.
+Here, @strong{i} must be a positive number used to iterate over the various 
@strong{key shares} used for the various @strong{escrow methods}
+at the various providers.
 
-  // mime type of truth, i.e. text/ascii, image/jpeg, etc.
-  truth_mime: string;
+@strong{nonce_i}: Nonce which is used to generate @emph{key_i} and @emph{iv_i} 
which are used for the encryption of the @strong{key share}. @strong{i} must be
+the same number as specified above for @emph{encrypted_key_share_i}. Nonce 
must contain the string “EKS” plus the according @emph{i}.
 
-@}
+As a special rule, when a @strong{security question} is used to authorize 
access to an
+@strong{encrypted_key_share_i}, then the salt “eks” is replaced with an 
(expensive) hash
+of the answer to the security question as an additional way to make the key 
share
+inaccessible to those who do not have the answer:
+
+@example
+powh := POW_HASH (qsalt, answer)
+ekss := HKDF("Anastasis-secure-question-uuid-salting",
+             powh,
+             uuid);
+(iv_i, key_i) := HKDF(key_id, nonce_i, ekss, [optional data], keysize + ivsize)
 @end example
-@end deffn
 
-@anchor{anastasis get--truth-$UUID[?response=$H_RESPONSE]}@anchor{22}
-@deffn {HTTP Get} GET /truth/$UUID[?response=$H_RESPONSE]
+@strong{qsalt}: Salt value used to hash answer to satisfy the challenge to 
prevent the provider from determining the answer via guessing.
 
-Get the stored encrypted key share. If @code{$H_RESPONSE} is specified by the 
client, the server checks
-if @code{$H_RESPONSE} matches the expected response specified before within 
the @ref{21,,TruthUploadRequest} (see encrypted_truth).
-Also, the user has to provide the correct @emph{truth_encryption_key} with 
every get request (see below).
-When @code{$H_RESPONSE} is correct, the server responds with the encrypted key 
share.
-The encrypted key share is returned simply as a byte array and not in JSON 
format.
+@strong{answer}: Answer to the security question, in UTF-8, as entered by the 
user.
 
-@strong{Response}:
+@strong{powh}: Result of the (expensive, proof-of-work) hash algorithm.
 
+@strong{uuid}: UUID of the challenge associated with the security question and 
the encrypted key share.
 
-@table @asis
+@strong{ekss}: Replacement salt to be used instead of “eks” when deriving the 
key to encrypt/decrypt the key share.
 
-@item 200 
OK@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.1}:
+@node Signatures,,Encryption<2>,Key Usage
+@anchor{cryptography signatures}@anchor{1f}
+@subsubsection Signatures
 
-@ref{23,,EncryptedKeyShare} is returned in body (in binary).
 
-@item 202 
Accepted@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.3}:
+The EdDSA keys are used to sign the data sent from the client to the
+server. Everything the client sends to server is signed. The following
+algorithm is equivalent for @strong{Anastasis-Policy-Signature}.
 
-The escrow provider will respond out-of-band (i.e. SMS).
-The body may contain human-readable instructions on next steps.
+@example
+(anastasis-account-signature) := eddsa_sign(h_body, eddsa_priv)
+ver_res := eddsa_verifiy(h_body, anastasis-account-signature, eddsa_pub)
+@end example
 
-@item >>208 Already Reported<<:
+@strong{anastasis-account-signature}: Signature over the SHA-512 hash of the 
body using the purpose code @code{TALER_SIGNATURE_ANASTASIS_POLICY_UPLOAD} 
(1400) (see GNUnet EdDSA signature API for the use of purpose).
 
-An authentication challenge was recently send, client should
-simply respond to the pending challenge.
+@strong{h_body}: The hashed body.
 
-@item 303 See 
other@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.4}:
+@strong{ver_res}: A boolean value. True: Signature verification passed, False: 
Signature verification failed.
 
-The provider redirects for authentication (i.e. video identification/WebRTC).
-If the client is not a browser, it should launch a browser at the URL
-given in the “Location” header and allow the user to re-try the operation
-after successful authorization.
+When requesting policy downloads, the client must also provide a signature:
 
-@item 402 Payment 
required@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.3}:
+@example
+(anastasis-account-signature) := eddsa_sign(version, eddsa_priv)
+ver_res := eddsa_verifiy(version, anastasis-account-signature, eddsa_pub)
+@end example
 
-The service requires payment for access to truth.
-See the Taler payment protocol specification for how to pay.
-The response body MAY provide alternative means for payment.
+@strong{anastasis-account-signature}: Signature over the SHA-512 hash of the 
body using the purpose code @code{TALER_SIGNATURE_ANASTASIS_POLICY_DOWNLOAD} 
(1401) (see GNUnet EdDSA signature API for the use of purpose).
 
-@item 403 
Forbidden@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.4}:
+@strong{version}: The version requested as a 64-bit integer, 2^64-1 for the 
“latest version”.
 
-The server requires a valid “response” to the challenge associated with the 
UUID.
+@strong{ver_res}: A boolean value. True: Signature verification passed, False: 
Signature verification failed.
 
-@item 404 Not 
found@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.5}:
+@node Availability Considerations,,Key Usage,Cryptography
+@anchor{cryptography availability-considerations}@anchor{20}
+@subsection Availability Considerations
 
-The server does not know any truth under the given UUID.
 
-@item 410 
Gone@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.11}:
+Anastasis considers two main threats against availability. First, the
+Anastasis server operators must be protected against denial-of-service attacks
+where an adversary attempts to exhaust the operator’s resources.  The API 
protects
+against these attacks by allowing operators to set fees for all
+operations. Furthermore, all data stored comes with an expiration logic, so an
+attacker cannot force servers to store data indefinitely.
 
-The server has not (recently) issued a challenge under the given UUID,
-but a reply was provided. (This does not apply for secure question.)
+A second availability issue arises from strong adversaries that may be able to
+compute the account keys of some user.  While we assume that such an adversary
+cannot successfully authenticate against the truth, the account key does
+inherently enable these adversaries to upload a new policy for the account.
+This cannot be prevented, as the legitimate user must be able to set or change
+a policy using only the account key.  To ensure that an adversary cannot
+exploit this, policy uploads first of all never delete existing policies, but
+merely create another version.  This way, even if an adversary uploads a
+malicious policy, a user can still retrieve an older version of the policy to
+recover access to their data.  This append-only storage for policies still
+leaves a strong adversary with the option of uploading many policies to
+exhaust the Anastasis server’s capacity.  We limit this attack by requiring a
+policy upload to include a reference to a @strong{payment identifier} from a 
payment
+made by the user.  Thus, a policy upload requires both knowledge of the
+@strong{identity} and making a payment.  This effectively prevents an adversary
+from using the append-only policy storage from exhausting Anastasis server
+capacity.
 
-@item 417 Expectation 
Failed@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.18}:
+@c This file is part of Anastasis
+@c Copyright (C) 2019-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero General Public License as published by the Free 
Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
+@c @author Dominik Meister
+@c @author Dennis Neufeld
 
-The decrypted ‘truth’ does not match the expectations of the authentication
-backend, i.e. a phone number for sending an SMS is not a number, or
-an e-mail address for sending an E-mail is not a valid e-mail address.
+@node REST API,Reducer API,Cryptography,Documentation Overview
+@anchor{rest doc}@anchor{21}@anchor{rest rest-api}@anchor{22}
+@section REST API
 
-@item 503 Service 
Unavailable@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.4}:
 
-Server is out of Service.
-@end table
+@c This file is part of Anastasis
+@c 
+@c Copyright (C) 2014-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero Public License as published by the Free Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
 
-@emph{Truth-Decryption-Key}: Key used to encrypt the @strong{truth} (see 
encrypted_truth within @ref{21,,TruthUploadRequest}) and which has to provided 
by the user. The key is stored with
-the according @ref{1c,,EscrowMethod}. The server needs this key to get the 
info out of @ref{21,,TruthUploadRequest} needed to verify the @code{$RESPONSE}.
+@menu
+* HTTP Request and Response:: 
+* Protocol Version Ranges:: 
+* Common encodings:: 
 
-@strong{Details:}
-@anchor{anastasis encryptedkeyshare}@anchor{23}
-@example
-interface EncryptedKeyShare @{
-  // Nonce used to compute the decryption (iv,key) pair.
-  nonce_i: [32]; //bytearray
+@end menu
 
-  // Authentication tag
-  aes_gcm_tag_i: [16]; //bytearray
+@node HTTP Request and Response,Protocol Version Ranges,,REST API
+@anchor{rest http-common}@anchor{23}@anchor{rest 
http-request-and-response}@anchor{24}
+@subsection HTTP Request and Response
 
-  // Encrypted key-share in base32 encoding.
-  // After decryption, this yields a `KeyShare`.  Note that
-  // the `KeyShare` MUST be encoded as a fixed-size binary
-  // block (instead of in JSON encoding).
-  //
-  // HKDF for the key generation must include the
-  // string "eks" as salt.
-  // Depending on the method,
-  // the HKDF may additionally include
-  // bits from the response (i.e. some hash over the
-  // answer to the security question)
-  encrypted_key_share_i: [32]; //bytearray
 
-@}
-@end example
-@anchor{anastasis keyshare}@anchor{24}
-@example
-interface KeyShare @{
-  // Key material to concatenate with policy_salt and KDF to derive
-  // the key to decrypt the master key.
-  key_share: [32]; //bytearray
+Certain response formats are common for all requests. They are documented here
+instead of with each individual request.  Furthermore, we note that clients may
+theoretically fail to receive any response.  In this case, the client should
+verify that the Internet connection is working properly, and then proceed to
+handle the error as if an internal error (500) had been returned.
 
-  // Signature over method, uuid, and key_share.
-  account_sig: EddsaSignature;
+@anchor{rest any--*}@anchor{25}
+@deffn {HTTP Any} ANY /*
 
-@}
-@end example
-@end deffn
+@strong{Request:}
 
-@node Anastasis Reducer API,Authentication Methods,Anastasis REST API,Top
-@anchor{anastasis anastasis-reducer-api}@anchor{25}
-@chapter Anastasis Reducer API
+Unless specified otherwise, HTTP requests that carry a message body must
+have the content type @code{application/json}.
 
+@*Request Headers: 
 
-This section describes the Anastasis Reducer API which is used by client 
applications
-to store or load the different states the client application can have.
-The reducer takes a @ref{26,,state} in JSON syntax and returns the new state 
in JSON syntax.
+@itemize *
 
-For example a @strong{state} may take the following structure:
+@item 
+Content-Type@footnote{https://tools.ietf.org/html/rfc7231#section-3.1.1.5} – 
application/json
+@end itemize
 
-@example
-@{
-  "backup_state": "CONTINENT_SELECTING",
-  "continents": [
-    "Europe",
-    "North_America"
-  ]
-@}
-@end example
 
-The new state depends on the previous one and on the transition 
@ref{27,,action} with its
-arguments given to the reducer. A @strong{transition argument} also is a 
statement in JSON syntax:
+@strong{Response:}
 
-@example
-@{
-  "continent": "Europe"
-@}
-@end example
+@*Response Headers: 
 
-The new state returned by the reducer with the state and transition argument 
defined
-above would look like following for the transition @ref{27,,action} 
“select_continent”:
+@itemize *
+
+@item 
+Content-Type@footnote{https://tools.ietf.org/html/rfc7231#section-3.1.1.5} – 
application/json
+@end itemize
+
+
+
+@table @asis
+
+@item 200 
Ok@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.1}:
+
+The request was successful.
+
+@item 400 Bad 
request@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1}:
+
+One of the arguments to the request is missing or malformed.
+
+@item 500 Internal server 
error@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1}:
+
+This always indicates some serious internal operational error of the Anastasis
+provider, such as a program bug, database problems, etc., and must not be used 
for
+client-side problems.  When facing an internal server error, clients should
+retry their request after some delay.  We recommended initially trying after
+1s, twice more at randomized times within 1 minute, then the user should be
+informed and another three retries should be scheduled within the next 24h.
+If the error persists, a report should ultimately be made to the auditor,
+although the auditor API for this is not yet specified.  However, as internal
+server errors are always reported to the exchange operator, a good operator
+should naturally be able to address them in a timely fashion, especially
+within 24h.
+@end table
+
+Unless specified otherwise, all error status codes (4xx and 5xx) have a message
+body with an @ref{26,,ErrorDetail} JSON object.
+
+@strong{Details:}
 
 @example
-@{
-  "backup_state": "COUNTRY_SELECTING",
-  "continents": [
-    "Europe",
-    "North_America"
-  ],
-  "selected_continent": "Europe",
-  "countries": [
-    @{
-      "code": "ch",
-      "name": "Switzerland",
-      "continent": "Europe",
-      "name_i18n": @{
-        "de_DE": "Schweiz",
-        "de_CH": "Schwiiz",
-        "fr": "Suisse",
-        "en": "Swiss"
-      @},
-      "currency": "CHF"
-    @},
-    @{
-      "code": "de",
-      "name": "Germany",
-      "continent": "Europe",
-      "continent_i18n": @{
-        "de": "Europa"
-      @},
-      "name_i18n": @{
-        "de_DE": "Deutschland",
-        "de_CH": "Deutschland",
-        "fr": "Allemagne",
-        "en": "Germany"
-      @},
-      "currency": "EUR"
-    @}
-  ]
+interface ErrorDetail @{
+
+  // Numeric error code unique to the condition, see 
`@w{`}gnu-taler-error-codes`@w{`} in GANA.
+  // The other arguments are specific to the error value reported here.
+  code: number;
+
+  // Human-readable description of the error, i.e. "missing parameter", 
"commitment violation", ...
+  // Should give a human-readable hint about the error's nature. Optional, may 
change without notice!
+  hint?: string;
+
 @}
 @end example
+@end deffn
 
-@menu
-* States::
-* Backup Reducer::
-* Recovery Reducer::
-* Reducer transitions::
+@node Protocol Version Ranges,Common encodings,HTTP Request and Response,REST 
API
+@anchor{rest protocol-version-ranges}@anchor{27}
+@subsection Protocol Version Ranges
 
-@end menu
 
-@node States,Backup Reducer,,Anastasis Reducer API
-@anchor{anastasis states}@anchor{28}
-@section States
+Anastasis services expose the range of API versions they support.  Clients in
+turn have an API version range they support.  These version ranges are written
+down in the libtool version 
format@footnote{https://www.gnu.org/software/libtool/manual/html_node/Libtool-versioning.html}.
 
+A protocol version is a positive, non-zero integer.  A protocol version range 
consists of three components:
 
-Overall, the reducer knows the following states:
 
-@quotation
+@enumerate 
 
+@item 
+The @code{current} version.  This is the latest version of the protocol 
supported by the client or service.
 
-@itemize -
+@item 
+The @code{revision} number.  This value should usually not be interpreted by 
the client/server, but serves
+purely as a comment.  Each time a service/client for a protocol is updated 
while supporting the same
+set of protocol versions, the revision should be increased.
+In rare cases, the revision number can be used to work around unintended 
breakage in deployed
+versions of a service.  This is discouraged and should only be used in 
exceptional situations.
 
-@item
+@item 
+The @code{age} number.  This non-zero integer identifies with how many 
previous protocol versions this
+implementation is compatible.  An @code{age} of 0 implies that the 
implementation only supports
+the @code{current} protocol version.  The @code{age} must be less or equal 
than the @code{current} protocol version.
+@end enumerate
 
-@table @asis
+To avoid confusion with semantic versions, the protocol version range is 
written down in the following format:
 
-@item @strong{ERROR}: The transition lead to an error. No further transitions 
are possible from
+@example
+current[:revision[:age]]
+@end example
 
-this state, but the client may want to continue from a previous state.
-@end table
+The angle brackets mark optional components. If either @code{revision} or 
@code{age} are omitted, they default to 0.
 
-@item
+Examples:
 
-@table @asis
 
-@item @strong{CONTINENT_SELECTING}: The user should specify the continent 
where they are living,
+@itemize *
 
-so that we can show a list of countries to choose from.
-@end table
+@item 
+“1” and “1” are compatible
 
-@item
+@item 
+“1” and “2” are @strong{incompatible}
 
-@table @asis
+@item 
+“2:0:1” and “1:0:0” are compatible
 
-@item @strong{COUNTRY_SELECTING}: The user should specify the country where 
they are living,
+@item 
+“2:5:1” and “1:10:0” are compatible
 
-so that we can determine appropriate attributes, currencies and Anastasis
-providers.
-@end table
+@item 
+“4:0:1” and “2:0:0” are @strong{incompatible}
 
-@item
+@item 
+“4:0:1” and “3:0:0” are compatible
+@end itemize
 
-@table @asis
+@cartouche
+@quotation Note 
+Semantic versions@footnote{https://semver.org/} are not a good tool for this 
job, as we concisely want to express
+that the client/server supports the last @code{n} versions of the protocol.
+Semantic versions don’t support this, and semantic version ranges are too 
complex for this.
+@end quotation
+@end cartouche
 
-@item @strong{USER_ATTRIBUTES_COLLECTING}: The user should provide the 
country-specific personal
+@cartouche
+@quotation Warning 
+A client doesn’t have one single protocol version range.  Instead, it has
+a protocol version range for each type of service it talks to.
+@end quotation
+@end cartouche
 
-attributes.
-@end table
+@cartouche
+@quotation Warning 
+For privacy reasons, the protocol version range of a client should not be
+sent to the service.  Instead, the client should just use the two version 
ranges
+to decide whether it will talk to the service.
+@end quotation
+@end cartouche
 
-@item
+@node Common encodings,,Protocol Version Ranges,REST API
+@anchor{rest common-encodings}@anchor{28}@anchor{rest encodings-ref}@anchor{29}
+@subsection Common encodings
 
-@table @asis
 
-@item @strong{AUTHENTICATIONS_EDITING}: The user should add authentication 
methods to be used
+This section describes how certain types of values are represented throughout 
the API.
 
-during recovery.
-@end table
+@menu
+* Binary Data:: 
+* Hash codes:: 
+* Large numbers:: 
+* Timestamps:: 
+* Integers:: 
+* Objects:: 
+* Keys:: 
+* Signatures: Signatures<2>. 
+* Amounts:: 
+* Time:: 
+* Cryptographic primitives:: 
+* Signatures: Signatures<3>. 
+* Receiving Configuration:: 
+* Receiving Terms of Service:: 
+* Manage policy:: 
+* Managing truth:: 
 
-@item
-@strong{POLICIES_REVIEWING}: The user should review the recovery policies.
+@end menu
 
-@item
-@strong{SECRET_EDITING}: The user should edit the secret to be backed up.
+@node Binary Data,Hash codes,,Common encodings
+@anchor{rest base32}@anchor{2a}@anchor{rest binary-data}@anchor{2b}
+@subsubsection Binary Data
 
-@item
 
-@table @asis
+@example
+type Base32 = string;
+@end example
 
-@item @strong{TRUTHS_PAYING}: The user needs to pay for one or more uploads of 
data associated
+Binary data is generally encoded using Crockford’s variant of Base32
+(@indicateurl{http://www.crockford.com/wrmg/base32.html}), except that “U” is 
not excluded
+but also decodes to “V” to make OCR easy.  We will still simply use the JSON
+type “base32” and the term “Crockford Base32” in the text to refer to the
+resulting encoding.
 
-with an authentication method.
-@end table
+@node Hash codes,Large numbers,Binary Data,Common encodings
+@anchor{rest hash-codes}@anchor{2c}
+@subsubsection Hash codes
 
-@item
-@strong{POLICIES_PAYING}: The user needs to pay for storing the recovery 
policy document.
 
-@item
-@strong{BACKUP_FINISHED}: A backup has been successfully generated.
+Hash codes are strings representing base32 encoding of the respective
+hashed data. See @ref{2a,,base32}.
 
-@item
+@example
+// 64-byte hash code.
+type HashCode = string;
+@end example
 
-@table @asis
+@example
+// 32-byte hash code.
+type ShortHashCode = string;
+@end example
 
-@item @strong{CHALLENGE_SELECTING}: The user needs to select an authorization 
challenge to
+@node Large numbers,Timestamps,Hash codes,Common encodings
+@anchor{rest large-numbers}@anchor{2d}
+@subsubsection Large numbers
 
-proceed with recovery.
-@end table
 
-@item
-@strong{CHALLENGE_PAYING}: The user needs to pay to proceed with the 
authorization challenge.
+Large numbers such as 256 bit keys, are transmitted as other binary data in
+Crockford Base32 encoding.
 
-@item
-@strong{CHALLENGE_SOLVING}: The user needs to solve the authorization 
challenge.
+@node Timestamps,Integers,Large numbers,Common encodings
+@anchor{rest timestamps}@anchor{2e}
+@subsubsection Timestamps
 
-@item
-@strong{RECOVERY_FINISHED}: The secret of the user has been recovered.
-@end itemize
-@end quotation
 
-State names:
+Timestamps are represented by the following structure:
 
-@quotation
+@example
+interface Timestamp @{
+  // Milliseconds since epoch, or the special
+  // value "never" to represent an event that will
+  // never happen.
+  t_ms: number | "never";
+@}
+@end example
 
+@example
+interface Duration @{
+  // Duration in milliseconds or "forever"
+  // to represent an infinite duration.
+  d_ms: number | "forever";
+@}
+@end example
 
-@itemize -
+@node Integers,Objects,Timestamps,Common encodings
+@anchor{rest integers}@anchor{2f}@anchor{rest publickey}@anchor{30}
+@subsubsection Integers
 
-@item
-In SELECTING-states, the user has to choose one value out of a predefined set 
of values (for example a continent out of a set of continents).
 
-@item
-In COLLECTING-states, the user has to give certain values.
+@example
+// JavaScript numbers restricted to integers.
+type Integer = number;
+@end example
 
-@item
-In EDITING-states, the user is free to choose which values he wants to give.
+@node Objects,Keys,Integers,Common encodings
+@anchor{rest objects}@anchor{31}
+@subsubsection Objects
 
-@item
-In REVEIWING-states, the user may make a few choices, but primarily is 
expected to affirm something.
 
-@item
-in PAYING-states, the user must make a payment.
+@example
+// JavaScript objects, no further restrictions.
+type Object = object;
+@end example
 
-@item
-in FINISHED-states, the operation has definitively concluded.
-@end itemize
-@end quotation
+@node Keys,Signatures<2>,Objects,Common encodings
+@anchor{rest keys}@anchor{32}
+@subsubsection Keys
 
-@node Backup Reducer,Recovery Reducer,States,Anastasis Reducer API
-@anchor{anastasis backup-reducer}@anchor{29}
-@section Backup Reducer
 
-@anchor{anastasis state}@anchor{26}@anchor{anastasis action}@anchor{27}
+@example
+// EdDSA and ECDHE public keys always point on Curve25519
+// and represented  using the standard 256 bits Ed25519 compact format,
+// converted to Crockford `Base32`.
+type EddsaPublicKey = string;
+@end example
 
-@float Figure
+@example
+// EdDSA and ECDHE public keys always point on Curve25519
+// and represented  using the standard 256 bits Ed25519 compact format,
+// converted to Crockford `Base32`.
+type EddsaPrivateKey = string;
+@end example
 
-@image{anastasis-figures/anastasis_reducer_backup,,,fig-anastasis_reducer_backup,png}
+@node Signatures<2>,Amounts,Keys,Common encodings
+@anchor{rest signature}@anchor{33}@anchor{rest signatures}@anchor{34}
+@subsubsection Signatures
 
-@caption{Backup states and their transitions.}
 
-@end float
+@example
+// EdDSA signatures are transmitted as 64-bytes `base32`
+// binary-encoded objects with just the R and S values (base32_ binary-only).
+type EddsaSignature = string;
+@end example
 
+@node Amounts,Time,Signatures<2>,Common encodings
+@anchor{rest amount}@anchor{35}@anchor{rest amounts}@anchor{36}
+@subsubsection Amounts
 
-The illustration above shows the different states the reducer can have during 
a backup
-process.
 
-@node Recovery Reducer,Reducer transitions,Backup Reducer,Anastasis Reducer API
-@anchor{anastasis recovery-reducer}@anchor{2a}
-@section Recovery Reducer
+@example
+type Amount = string;
+@end example
 
+Amounts of currency are serialized as a string of the format
+@code{<Currency>:<DecimalAmount>}.  Taler treats monetary amounts as
+fixed-precision numbers, with 8 decimal places.  Unlike floating point numbers,
+this allows accurate representation of monetary amounts.
 
+The following constrains apply for a valid amount:
 
-@float Figure
 
-@image{anastasis-figures/anastasis_reducer_recovery,,,fig-anastasis_reducer_recovery,png}
+@enumerate 
 
-@caption{Recovery states and their transitions.}
+@item 
+The @code{<Currency>} part must be at most 11 characters long and may only 
consist
+of ASCII letters (@code{a-zA-Z}).
 
-@end float
+@item 
+The integer part of @code{<DecimalAmount>} may be at most 2^52.
 
+@item 
+The fractional part of @code{<DecimalAmount>} may contain at most 8 decimal 
digits.
+@end enumerate
 
-The illustration above shows the different states the reducer can have during 
a recovery
-process.
+@cartouche
+@quotation Note 
+“EUR:1.50” and “EUR:10” are valid amounts.  These are all invalid amounts: 
“A:B:1.5”, “EUR:4503599627370501.0”, “EUR:1.”, “EUR:.1”.
+@end quotation
+@end cartouche
 
-@node Reducer transitions,,Recovery Reducer,Anastasis Reducer API
-@anchor{anastasis reducer-transitions}@anchor{2b}
-@section Reducer transitions
+An amount that is prefixed with a @code{+} or @code{-} character is also used 
in certain contexts.
+When no sign is present, the amount is assumed to be positive.
 
+@node Time,Cryptographic primitives,Amounts,Common encodings
+@anchor{rest time}@anchor{37}
+@subsubsection Time
 
-In the following, the individual transitions will be specified in more detail.
-Note that we only show fields added by the reducer, typically the previous
-state is preserved to enable “back” transitions to function smoothly.
 
-@menu
-* Initial state::
-* Common transitions::
-* Backup transitions::
-* Recovery transitions::
+In signed messages, time is represented using 64-bit big-endian values,
+denoting microseconds since the UNIX Epoch.  @code{UINT64_MAX} represents 
“never”.
 
-@end menu
+@example
+struct GNUNET_TIME_Absolute @{
+  uint64_t timestamp_us;
+@};
+struct GNUNET_TIME_AbsoluteNBO @{
+  uint64_t abs_value_us__;       // in network byte order
+@};
+@end example
 
-@node Initial state,Common transitions,,Reducer transitions
-@anchor{anastasis initial-state}@anchor{2c}
-@subsection Initial state
+@node Cryptographic primitives,Signatures<3>,Time,Common encodings
+@anchor{rest cryptographic-primitives}@anchor{38}
+@subsubsection Cryptographic primitives
 
 
-The initial states for backup and recovery processes are:
-
-@strong{Initial backup state:}
+All elliptic curve operations are on Curve25519.  Public and private keys are
+thus 32 bytes, and signatures 64 bytes.  For hashing, including HKDFs, Taler
+uses 512-bit hash codes (64 bytes).
 
 @example
-@{
-  "backup_state": "CONTINENT_SELECTING",
-  "continents": [
-    "Europe",
-    "North America"
-  ]
-@}
+struct GNUNET_HashCode @{
+  uint8_t hash[64];      // usually SHA-512
+@};
+@end example
+@anchor{rest taler-ecdhephemeralpublickeyp}@anchor{39}
+@example
+struct TALER_EcdhEphemeralPublicKeyP @{
+  uint8_t ecdh_pub[32];
+@};
 @end example
-
-@strong{Initial recovery state:}
 
 @example
-@{
-  "recovery_state": "CONTINENT_SELECTING",
-  "continents": [
-    "Europe",
-    "North America"
-  ]
-@}
+struct UUID @{
+  uint32_t value[4];
+@};
 @end example
 
-Here, “continents” is an array of English strings with the names of the
-continents which contain countries for which Anastasis could function (based
-on having providers that are known to operate and rules being provided for
-user attributes from those countries).
+@node Signatures<3>,Receiving Configuration,Cryptographic primitives,Common 
encodings
+@anchor{rest id1}@anchor{3a}@anchor{rest id2}@anchor{3b}
+@subsubsection Signatures
 
-For internationalization, another field “continents_i18n” may be present.
-This field would be a map of language names to arrays of translated
-continent names:
+
+Any piece of signed data, complies to the abstract data structure given below.
 
 @example
-@{
-  "recovery_state": "CONTINENT_SELECTING",
-  "continents": [
-    "Europe",
-    "North America"
-  ]
-  "continents_i18n":
-  @{
-    "de_DE" : [
-      "Europa",
-      "Nordamerika"
-      ],
-    "de_CH" : [
-      "Europa",
-      "Nordamerika"
-      ]
-  @}
-@}
+struct Data @{
+  struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
+  type1_t payload1;
+  type2_t payload2;
+  ...
+@};
+
+/*From gnunet_crypto_lib.h*/
+struct GNUNET_CRYPTO_EccSignaturePurpose @{
+  /**
+
+  The following constraints apply for a valid amount:
+
+   * This field is used to express the context in
+   * which the signature is made, ensuring that a
+   * signature cannot be lifted from one part of the protocol
+   * to another. See `src/include/taler_signatures.h` within the
+   * exchange's codebase (git://taler.net/exchange).
+   */
+  uint32_t purpose;
+  /**
+   * This field equals the number of bytes being signed,
+   * namely 'sizeof (struct Data)'.
+   */
+  uint32_t size;
+@};
 @end example
+@anchor{rest salt}@anchor{3c}
+@node Receiving Configuration,Receiving Terms of Service,Signatures<3>,Common 
encodings
+@anchor{rest config}@anchor{3d}@anchor{rest receiving-configuration}@anchor{3e}
+@subsubsection Receiving Configuration
 
-Translations must be given in the same order as the main English array.
-
-@node Common transitions,Backup transitions,Initial state,Reducer transitions
-@anchor{anastasis common-transitions}@anchor{2d}
-@subsection Common transitions
 
+@anchor{rest get--config}@anchor{3f}
+@deffn {HTTP Get} GET /config
 
-@strong{select_continent:}
+Obtain the configuration details of the escrow provider.
 
-Here the user specifies the continent they live on.  Arguments (example):
+@strong{Response:}
 
+Returns an @ref{40,,EscrowConfigurationResponse}.
+@anchor{rest escrowconfigurationresponse}@anchor{40}
 @example
-@{
-  "continent": "Europe"
-@}
-@end example
+interface EscrowConfigurationResponse @{
 
-The continent must be given using the English name from the “continents” array.
-Using a translated continent name is invalid and may result in failure.
+  // Protocol identifier, clarifies that this is an Anastasis provider.
+  name: "anastasis";
 
-The reducer returns an updated state with a list of countries to choose from,
-for example:
+  // libtool-style representation of the Exchange protocol version, see
+  // 
https://www.gnu.org/software/libtool/manual/html_node/Versioning.html#Versioning
+  // The format is "current:revision:age".
+  version: string;
 
-@example
-@{
-  "backup_state": "COUNTRY_SELECTING",
-  "selected_continent": "Europe",
-  "countries": [
-    @{
-      "code": "ch",
-      "name": "Switzerland",
-      "continent": "Europe",
-      "name_i18n": @{
-        "de_DE": "Schweiz",
-        "de_CH": "Schwiiz",
-        "fr": "Suisse",
-        "en": "Swiss"
-      @},
-      "currency": "CHF"
-    @},
-    @{
-      "code": "de",
-      "name": "Germany",
-      "continent": "Europe",
-      "continent_i18n": @{
-        "de": "Europa"
-      @},
-      "name_i18n": @{
-        "de_DE": "Deutschland",
-        "de_CH": "Deutschland",
-        "fr": "Allemagne",
-        "en": "Germany"
-      @},
-      "currency": "EUR"
-    @}
-  ]
-@}
-@end example
+  // Currency in which this provider processes payments.
+  currency: string;
 
-Here “countries” is an array of countries on the “selected_continent”.  For
-each country, the “code” is the ISO 3166-1 alpha-2 country code.  The
-“continent” is only present because some countries span continents, the
-information is redundant and will always match “selected_continent”.  The
-“name” is the name of the country in English, internationalizations of the
-name may be provided in “name_i18n”.  The “currency” is @strong{an} official
-currency of the country, if a country has multiple currencies, it may appear
-multiple times in the list.  In this case, the user should select the entry
-with the currency they intend to pay with.  It is also possible for users
-to select a currency that does not match their country, but user interfaces
-should by default try to use currencies that match the user’s residence.
+  // Supported authorization methods.
+  methods: AuthorizationMethodConfig[];
 
-@strong{select_country:}
+  // Maximum policy upload size supported.
+  storage_limit_in_megabytes: number;
 
-Selects the country (via the country code) and specifies the currency.
-The latter is needed as some countries have more than one currency,
-and some use-cases may also involve users insisting on paying with
-foreign currency.
+  // Payment required to maintain an account to store policy documents for a 
year.
+  // Users can pay more, in which case the storage time will go up 
proportionally.
+  annual_fee: Amount;
 
-Arguments (example):
+  // Payment required to upload truth.  To be paid per upload.
+  truth_upload_fee: Amount;
+
+  // Limit on the liability that the provider is offering with
+  // respect to the services provided.
+  liability_limit: Amount;
+
+  // Salt value with 128 bits of entropy.
+  // Different providers
+  // will use different high-entropy salt values. The resulting
+  // **provider salt** is then used in various operations to ensure
+  // cryptographic operations differ by provider.  A provider must
+  // never change its salt value.
+  server_salt: string;
 
-@example
-@{
-  "country_code": "de",
-  "currency": "EUR"
 @}
 @end example
+@anchor{rest authorizationmethodconfig}@anchor{41}
+@example
+interface AuthorizationMethodConfig @{
+  // Name of the authorization method.
+  type: string;
 
-The “country_code” must be an ISO 3166-1 alpha-2 country code from
-the array of “countries” of the reducer’s state.  The “currency”
-field must be a valid currency accepted by the Taler payment system.
-
-The reducer returns a new state with the list of attributes the
-user is expected to provide, as well as possible authentication
-providers that accept payments in the selected currency:
+  // Fee for accessing key share using this method.
+  cost: Amount;
 
-@example
-@{
-  "backup_state": "USER_ATTRIBUTES_COLLECTING",
-  "selected_country": "de",
-  "currency": "EUR",
-  "required_attributes": [
-    @{
-      "type": "string",
-      "name": "full_name",
-      "label": "Full name",
-      "label_i18n": @{
-        "de_DE": "Vollständiger Name",
-        "de_CH": "Vollständiger Name",
-        "fr": "Nom complet",
-        "en": "Full name"
-      @},
-      "widget": "anastasis_gtk_ia_full_name",
-      "uuid" : "9e8f463f-575f-42cb-85f3-759559997331"
-    @},
-    @{
-      "type": "date",
-      "name": "birthdate",
-      "label": "Birthdate",
-      "label_i18n": @{
-        "de_DE": "Geburtsdatum",
-        "de_CH": "Geburtsdatum",
-        "fr": "Date de naissance",
-        "en": "Birthdate"
-      @},
-      "uuid" : "83d655c7-bdb6-484d-904e-80c1058c8854"
-      "widget": "anastasis_gtk_ia_birthdate"
-    @},
-        @{
-           "type": "string",
-       "name": "tax_number",
-           "label": "Taxpayer identification number",
-           "label_i18n":@{
-                 "de_DE": "Steuerliche Identifikationsnummer",
-                 "de_CH": "Steuerliche Identifikationsnummer",
-                 "en": "German taxpayer identification number"
-           @},
-           "widget": "anastasis_gtk_ia_tax_de",
-       "uuid": "dae48f85-e3ff-47a4-a4a3-ed981ed8c3c6",
-           "validation-regex": "^[0-9]@{11@}$",
-           "validation-logic": "DE_TIN_check"
-        @},
-    @{
-      "type": "string",
-      "name": "social_security_number",
-      "label": "Social security number",
-      "label_i18n": @{
-        "de_DE": "Sozialversicherungsnummer",
-        "de_CH": "Sozialversicherungsnummer",
-        "fr": "Numéro de sécurité sociale",
-        "en": "Social security number"
-      @},
-      "widget": "anastasis_gtk_ia_ssn",
-          "validation-regex": "^[0-9]@{8@}[[:upper:]][0-9]@{3@}$",
-          "validation-logic": "DE_SVN_check"
-      "optional" : true
-  @}
-  ],
-  "authentication_providers": @{
-    "http://localhost:8089/": @{
-      "http_status": 200,
-      "methods": [
-        @{ "type" : "question",
-          "usage_fee" : "EUR:0.0" @},
-        @{ "type" : "sms",
-          "usage_fee" : "EUR:0.5" @}
-      ],
-      "annual_fee": "EUR:4.99",
-      "truth_upload_fee": "EUR:4.99",
-      "liability_limit": "EUR:1",
-      "currency": "EUR",
-      "truth_lifetime": @{ "d_ms" : 50000000 @},
-      "storage_limit_in_megabytes": 1,
-      "provider_name": "Anastasis 4",
-      "salt": "CXAPCKSH9D3MYJTS9536RHJHCW"
-    @},
-    "http://localhost:8088/": @{
-      "http_status": 200,
-      "methods": [
-        @{ "type" : "question",
-          "usage_fee" : "EUR:0.01" @},
-        @{ "type" : "sms",
-          "usage_fee" : "EUR:0.55" @}
-      ],
-      "annual_fee": "EUR:0.99",
-      "truth_upload_fee": "EUR:3.99",
-      "liability_limit": "EUR:1",
-      "currency": "EUR",
-      "truth_lifetime": @{ "d_ms" : 50000000 @},
-      "storage_limit_in_megabytes": 1,
-      "provider_name": "Anastasis 4",
-      "salt": "CXAPCKSH9D3MYJTS9536RHJHCW"
-    @}
-  @}
 @}
 @end example
+@end deffn
 
-The array of “required_attributes” contains attributes about the user
-that must be provided includes:
+@node Receiving Terms of Service,Manage policy,Receiving Configuration,Common 
encodings
+@anchor{rest receiving-terms-of-service}@anchor{42}@anchor{rest 
terms}@anchor{43}
+@subsubsection Receiving Terms of Service
 
-@quotation
 
+@anchor{rest get--terms}@anchor{44}
+@deffn {HTTP Get} GET /terms
 
-@itemize -
+Obtain the terms of service provided by the escrow provider.
 
-@item
-@strong{type}: the type of the attribute, for now only ‘string’ and ‘date’ are
-supported
+@strong{Response:}
 
-@item
-@strong{name}: the name of the attribute, this is the key under which the
-attribute value must be provided later. The name must be unique per response.
+Returns the terms of service of the provider, in the best language
+and format available based on the client’s request.
+@end deffn
 
-@item
-@strong{label}: a human-readable description of the attribute in English.
-Translated descriptions may be provided under @strong{label_i18n}.
+@anchor{rest get--privacy}@anchor{45}
+@deffn {HTTP Get} GET /privacy
 
-@item
-@strong{uuid}: a UUID that uniquely identifies identical attributes across
-different countries. Useful to preserve values should the user enter
-some attributes, and then switch to another country.  Note that
-attributes must not be preserved if they merely have the same @strong{name},
-only the @strong{uuid} will be identical if the semantics is identical.
+Obtain the privacy policy of the service provided by the escrow provider.
 
-@item
-@strong{widget}: an optional name of a widget that is known to nicely render
-the attribute entry in user interfaces where named widgets are
-supported.
+@strong{Response:}
 
-@item
-@strong{validation-regex}: an optional extended POSIX regular expression
-that is to be used to validate (string) inputs to ensure they are
-well-formed.
+Returns the privacy policy of the provider, in the best language
+and format available based on the client’s request.
+@end deffn
 
-@item
-@strong{validation-logic}: optional name of a function that should be called
-to validate the input.  If the function is not known to the particular
-client, the respective validation can be skipped (at the expense of
-typos by users not being detected, possibly rendering secrets
-irrecoverable).
+@node Manage policy,Managing truth,Receiving Terms of Service,Common encodings
+@anchor{rest id3}@anchor{46}@anchor{rest manage-policy}@anchor{47}
+@subsubsection Manage policy
 
-@item
-@strong{optional}: optional boolean field that, if @code{true}, indicates that
-this attribute is not actually required but optional and users MAY leave
-it blank in case they do not have the requested information. Used for
-common fields that apply to some large part of the population but are
-not sufficiently universal to be actually required.
-@end itemize
-@end quotation
 
-The authentication providers are listed under a key that is the
-base URL of the service. For each provider, the following
-information is provided if the provider was successfully contacted:
+This API is used by the Anastasis client to deposit or request encrypted
+recovery documents with the escrow provider.  Generally, a client will deposit
+the same encrypted recovery document with each escrow provider, but provide
+a different truth to each escrow provider.
 
-@quotation
+Operations by the client are identified and authorized by @code{$ACCOUNT_PUB}, 
which
+should be kept secret from third parties. @code{$ACCOUNT_PUB} should be an 
account
+public key using the Crockford base32-encoding.
 
+In the following, UUID is always defined and used according to RFC 
4122@footnote{https://tools.ietf.org/html/rfc4122}.
 
-@itemize -
+@anchor{rest get--policy-$ACCOUNT_PUB[?version=$NUMBER]}@anchor{48}
+@deffn {HTTP Get} GET /policy/$ACCOUNT_PUB[?version=$NUMBER]
 
-@item
-@strong{http_status}: HTTP status code, always 200 on success.
+Get the customer’s encrypted recovery document.  If @code{version}
+is not specified, the server returns the latest available version.  If
+@code{version} is specified, returns the policy with the respective
+@code{version}.  The response must begin with the nonce and
+an AES-GCM tag and continue with the ciphertext.  Once decrypted, the
+plaintext is expected to contain:
 
-@item
-@strong{methods}: array of authentication methods supported by this
-provider. Includes the @strong{type} of the authentication method
-and the @strong{usage_fee} (how much the user must pay for authorization
-using this method during recovery).
 
-@item
-@strong{annual_fee}: fee the provider charges to store the recovery
-policy for one year.
+@itemize *
 
-@item
-@strong{truth_upload_fee}: fee the provider charges to store a key share.
+@item 
+the escrow policy
 
-@item
-@strong{truth_lifetime}: Taler-style relative time that specifies how
-long the provider will store truth data (key shares) after an upload.
+@item 
+the separately encrypted master public key
+@end itemize
 
-@item
-@strong{liability_limit}: amount the provider can be held liable for in
-case a key share or recovery document cannot be recovered due to
-provider failures.
+Note that the key shares required to decrypt the master public key are
+not included, as for this the client needs to obtain authorization.
+The policy does provide sufficient information for the client to determine
+how to authorize requests for @strong{truth}.
 
-@item
-@strong{currency}: currency in which the provider wants to be paid,
-will match all of the fees.
+The client MAY provide an @code{If-None-Match} header with an Etag.
+In that case, the server MUST additionally respond with an @code{304} status
+code in case the resource matches the provided Etag.
 
-@item
-@strong{storage_limit_in_megabytes}: maximum size of an upload (for
-both recovery document and truth data) in megabytes.
+@strong{Response}:
 
-@item
-@strong{provider_name}: human-readable name of the provider’s business.
 
-@item
-@strong{salt}: salt value used by the provider, used to derive the
-user’s identity at this provider. Should be unique per provider,
-and must never change for a given provider.  The salt is
-base32 encoded.
-@end itemize
-@end quotation
+@table @asis
 
-If contacting the provider failed, the information returned is:
+@item 200 
OK@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.1}:
 
-@quotation
+The escrow provider responds with an @ref{49,,EncryptedRecoveryDocument} 
object.
 
+@item 304 Not 
modified@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5}:
 
-@itemize -
+The client requested the same resource it already knows.
 
-@item
-@strong{http_status}: HTTP status code (if available, possibly 0 if
-we did not even obtain an HTTP response).
+@item 400 Bad 
request@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1}:
 
-@item
-@strong{error_code}: Taler error code, never 0.
-@end itemize
-@end quotation
+The @code{$ACCOUNT_PUB} is not an EdDSA public key.
 
-@strong{add_provider}:
+@item 402 Payment 
Required@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.3}:
 
-This operation can be performed in state “USER_ATTRIBUTES_COLLECTING”.  It
-adds one or more Anastasis providers to the list of providers the reducer
-should henceforth consider.  Note that removing providers is not possible at
-this time.
+The account’s balance is too low for the specified operation.
+See the Taler payment protocol specification for how to pay.
 
-Here, the client must provide an array with the base URLs of the
-providers to add, for example:
+@item 403 
Forbidden@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.4}:
 
-@example
-@{
-  "urls": [
-    "http://localhost:8888/";,
-    "http://localhost:8089/";
-  ]
-@}
-@end example
+The required account signature was invalid.
 
-Note that existing providers will remain in the state.  The following is an
-example for an expected new state where the service on port 8089 is
-unreachable, the service on port 8088 was previously known, and service on
-port 8888 was now added:
+@item 404 Not 
found@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.5}:
 
-@example
-@{
-  "backup_state": "USER_ATTRIBUTES_COLLECTING",
-  "authentication_providers": @{
-    "http://localhost:8089/": @{
-      "error_code": 11,
-      "http_status": 0
-    @},
-    "http://localhost:8088/": @{
-      "http_status": 200,
-      "methods": [
-        @{ "type" : "question",
-          "usage_fee" : "EUR:0.01" @},
-        @{ "type" : "sms",
-          "usage_fee" : "EUR:0.55" @}
-      ],
-      "annual_fee": "EUR:0.99",
-      "truth_upload_fee": "EUR:3.99",
-      "liability_limit": "EUR:1",
-      "currency": "EUR",
-      "truth_lifetime": @{ "d_ms" : 50000000 @},
-      "storage_limit_in_megabytes": 1,
-      "provider_name": "Anastasis 4",
-      "salt": "CXAPCKSH9D3MYJTS9536RHJHCW"
-    @}
-    "http://localhost:8888/": @{
-      "methods": [
-        @{ "type" : "question",
-          "usage_fee" : "EUR:0.01" @},
-        @{ "type" : "sms",
-          "usage_fee" : "EUR:0.55" @}
-      ],
-      "annual_fee": "EUR:0.99",
-      "truth_upload_fee": "EUR:3.99",
-      "liability_limit": "EUR:1",
-      "currency": "EUR",
-      "truth_lifetime": @{ "d_ms" : 50000000 @},
-      "storage_limit_in_megabytes": 1,
-      "provider_name": "Anastasis 42",
-      "salt": "BXAPCKSH9D3MYJTS9536RHJHCX"
-    @}
-  @}
-@}
-@end example
+The requested resource was not found.
+@end table
 
-@node Backup transitions,Recovery transitions,Common transitions,Reducer 
transitions
-@anchor{anastasis backup-transitions}@anchor{2e}
-@subsection Backup transitions
+@emph{Anastasis-Version}: $NUMBER — The server must return actual version of 
the encrypted recovery document via this header.
+If the client specified a version number in the header of the request, the 
server must return that version. If the client
+did not specify a version in the request, the server returns latest version of 
the @ref{49,,EncryptedRecoveryDocument}.
 
+@emph{Etag}: Set by the server to the Base32-encoded SHA512 hash of the body. 
Used for caching and to prevent redundancies. The server MUST send the Etag if 
the status code is @code{200 OK}.
 
-@strong{enter_user_attributes:}
+@emph{If-None-Match}: If this is not the very first request of the client, 
this contains the Etag-value which the client has received before from the 
server.
+The client SHOULD send this header with every request (except for the first 
request) to avoid unnecessary downloads.
 
-This transition provides the user’s personal attributes. The specific set of
-attributes required depends on the country of residence of the user.  Some
-attributes may be optional, in which case they should be omitted entirely
-(that is, not simply be set to @code{null} or an empty string).  Example
-arguments would be:
+@emph{Anastasis-Account-Signature}: The client must provide Base-32 encoded 
EdDSA signature over hash of body with @code{$ACCOUNT_PRIV}, affirming desire 
to download the requested encrypted recovery document.  The purpose used MUST 
be @code{TALER_SIGNATURE_ANASTASIS_POLICY_DOWNLOAD} (1401).
+@end deffn
 
-@example
-@{
-  "identity_attributes": @{
-    "full_name": "Max Musterman",
-    "social_security_number": "123456789",
-    "birthdate": "2000-01-01",
-    "birthplace": "Earth"
- @}
-@}
-@end example
+@anchor{rest post--policy-$ACCOUNT_PUB}@anchor{4a}
+@deffn {HTTP Post} POST /policy/$ACCOUNT_PUB
 
-Note that at this stage, the state machines between backup and
-recovery diverge and the @code{recovery_state} will begin to look
-very different from the @code{backup_state}.
+Upload a new version of the customer’s encrypted recovery document.
+While the document’s structure is described in JSON below, the upload
+should just be the bytestream of the raw data (i.e. 32-byte nonce followed
+by 16-byte tag followed by the encrypted document).
+If the request has been seen before, the server should do nothing, and 
otherwise store the new version.
+The body must begin with a nonce, an AES-GCM tag and continue with the 
ciphertext.  The format
+is the same as specified for the response of the GET method. The
+Anastasis server cannot fully validate the format, but MAY impose
+minimum and maximum size limits.
 
-For backups, if all required attributes are present, the reducer will
-transition to an @code{AUTHENTICATIONS_EDITING} state with the attributes added
-to it:
+@strong{Request}:
 
-@example
-@{
-  "backup_state": "AUTHENTICATIONS_EDITING",
-  "identity_attributes": @{
-    "full_name": "Max Musterman",
-    "social_security_number": "123456789",
-    "birthdate": "2000-01-01",
-    "birthplace": "Earth"
-  @}
-@}
-@end example
+@*Query Parameters: 
 
-If required attributes are missing, do not match the required regular
-expression or fail the custom validation logic, the reducer SHOULD transition
-to an error state indicating what was wrong about the input.  A reducer that
-does not support some specific validation logic MAY accept the invalid input
-and proceed anyway.  The error state will include a Taler error code that
-is specific to the failure, and optional details.  Example:
+@itemize *
 
-@example
-@{
-  "backup_state": "ERROR",
-  "code": 8404,
-  "hint": "An input did not match the regular expression.",
-  "detail": "social_security_number"
-@}
-@end example
+@item 
+@code{storage_duration=YEARS} – For how many years from now would the client 
like us to
+store the recovery document? Defaults to 0 (that is, do
+not extend / prolong existing storage contract).
+The server will respond with a @code{402 Payment required}, but only
+if the rest of the request is well-formed (account
+signature must match).  Clients that do not actually
+intend to make a new upload but that only want to pay
+may attempt to upload the latest backup again, as this
+option will be checked before the @code{304 Not modified}
+case.
 
-Clients may safely repeat this transition to validate the user’s inputs
-until they satisfy all of the constraints.  This way, the user interface
-does not have to perform the input validation directly.
+@item 
+@code{timeout_ms=NUMBER} – @emph{Optional.}  If specified, the Anastasis 
server will
+wait up to @code{timeout_ms} milliseconds for completion of the payment before
+sending the HTTP response.  A client must never rely on this behavior, as the
+backend may return a response immediately.
+@end itemize
 
-@strong{add_authentication}:
 
-This transition adds an authentication method.  The method must be supported
-by one or more providers that are included in the current state.  Adding an
-authentication method requires specifying the @code{type} and 
@code{instructions} to
-be given to the user.  The @code{challenge} is encrypted and stored at the
-Anastasis provider. The specific semantics of the value depend on the
-@code{type}.  Typical challenges values are a phone number (to send an SMS to),
-an e-mail address (to send a PIN code to) or the answer to a security
-question.  Note that these challenge values will still be encrypted (and
-possibly hashed) before being given to the Anastasis providers.
+@emph{If-None-Match}: This header MUST be present and set to the SHA512 hash 
(Etag) of the body by the client.
+The client SHOULD also set the @code{Expect: 100-Continue} header and wait for 
@code{100 continue}
+before uploading the body.  The server MUST
+use the Etag to check whether it already knows the encrypted recovery document 
that is about to be uploaded.
+The server MUST refuse the upload with a @code{304} status code if the Etag 
matches
+the latest version already known to the server.
 
-Note that the @code{challenge} must be given in Crockford Base32 encoding, as 
it
-MAY include binary data (such as a photograph of the user).  In the latter
-case, the optional @code{mime_type} field must be provided to give the MIME 
type
-of the value encoded in @code{challenge}.
+@emph{Anastasis-Policy-Signature}: The client must provide Base-32 encoded 
EdDSA signature over hash of body with @code{$ACCOUNT_PRIV}, affirming desire 
to upload an encrypted recovery document.
 
-@example
-@{
-  "authentication_method":
-  @{
-    "type": "question",
-    "mime_type" : "text/plain",
-    "instructions" : "What is your favorite GNU package?",
-    "challenge" : "E1QPPS8A",
-  @}
-@}
-@end example
+@emph{Payment-Identifier}: Base-32 encoded 32-byte payment identifier that was 
included in a previous payment (see @code{402} status code). Used to allow the 
server to check that the client paid for the upload (to protect the server 
against DoS attacks) and that the client knows a real secret of financial value 
(as the @strong{kdf_id} might be known to an attacker). If this header is 
missing in the client’s request (or the associated payment has exceeded the 
upload limit), the server mus [...]
 
-If the information provided is valid, the reducer will add the new
-authentication method to the array of authentication methods:
+@strong{Response}:
+
+
+@table @asis
+
+@item 204 No 
content@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.5}:
+
+The encrypted recovery document was accepted and stored.  
@code{Anastasis-Version} and @code{Anastasis-UUID} headers
+indicate what version and UUID was assigned to this encrypted recovery 
document upload by the server.
+
+@item 304 Not 
modified@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5}:
+
+The same encrypted recovery document was previously accepted and stored.  
@code{Anastasis-Version} header
+indicates what version was previously assigned to this encrypted recovery 
document.
+
+@item 400 Bad 
request@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.1}:
+
+The @code{$ACCOUNT_PUB} is not an EdDSA public key or mandatory headers are 
missing.
+The response body MUST elaborate on the error using a Taler error code in the 
typical JSON encoding.
+
+@item 402 Payment 
required@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.3}:
+
+The account’s balance is too low for the specified operation.
+See the Taler payment protocol specification for how to pay.
+The response body MAY provide alternative means for payment.
+
+@item 403 
Forbidden@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.4}:
+
+The required account signature was invalid.  The response body may elaborate 
on the error.
+
+@item 413 Request entity too 
large@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.14}:
+
+The upload is too large @emph{or} too small. The response body may elaborate 
on the error.
+@end table
 
+@strong{Details:}
+@anchor{rest encryptedrecoverydocument}@anchor{49}
 @example
-@{
-  "backup_state": "AUTHENTICATIONS_EDITING",
-  "authentication_methods": [
-    @{
-      "type": "question",
-      "mime_type" : "text/plain",
-      "instructions" : "What is your favorite GNU package?",
-      "challenge" : "E1QPPS8A",
-    @},
-    @{
-      "type": "email",
-      "instructions" : "E-mail to user@@*le.com",
-      "challenge": "ENSPAWJ0CNW62VBGDHJJWRVFDM50"
-    @}
-  ]
+interface EncryptedRecoveryDocument @{
+  // Nonce used to compute the (iv,key) pair for encryption of the
+  // encrypted_compressed_recovery_document.
+  nonce: [32]; //bytearray
+
+  // Authentication tag.
+  aes_gcm_tag: [16]; //bytearray
+
+  // Variable-size encrypted recovery document. After decryption,
+  // this contains a gzip compressed JSON-encoded `RecoveryDocument`.
+  // The nonce of the HKDF for this encryption must include the
+  // string "ERD".
+  encrypted_compressed_recovery_document: []; //bytearray of undefined length
+
+@}
+@end example
+@anchor{rest recoverydocument}@anchor{4b}
+@example
+interface RecoveryDocument @{
+  // Account identifier at backup provider, AES-encrypted with
+  // the (symmetric) master_key, i.e. an URL
+  // https://sync.taler.net/$BACKUP_ID and
+  // a private key to decrypt the backup.  Anastasis is oblivious
+  // to the details of how this is ultimately encoded.
+  backup_account: []; //bytearray of undefined length
+
+  // List of escrow providers and selected authentication method.
+  methods: EscrowMethod[];
+
+  // List of possible decryption policies.
+  policy: DecryptionPolicy[];
+
+@}
+@end example
+@anchor{rest escrowmethod}@anchor{4c}
+@example
+interface EscrowMethod @{
+  // URL of the escrow provider (including possibly this Anastasis server).
+  provider_url : string;
+
+  // Type of the escrow method (e.g. security question, SMS etc.).
+  escrow_type: string;
+
+  // UUID of the escrow method (see /truth/ API below).
+  uuid: string;
+
+  // Key used to encrypt the `Truth` this `EscrowMethod` is related to.
+  // Client has to provide this key to the server when using 
`@w{`}/truth/`@w{`}.
+  truth_encryption_key: [32]; //bytearray
+
+  // Salt used to encrypt the truth on the Anastasis server.
+  truth_salt: [32]; //bytearray
+
+  // The challenge to give to the user (i.e. the security question
+  // if this is challenge-response).
+  // (Q: as string in base32 encoding?)
+  // (Q: what is the mime-type of this value?)
+  //
+  // For some methods, this value may be absent.
+  //
+  // The plaintext challenge is not revealed to the
+  // Anastasis server.
+  challenge: []; //bytearray of undefined length
+
+@}
+@end example
+@anchor{rest decryptionpolicy}@anchor{4d}
+@example
+interface DecryptionPolicy @{
+  // Salt included to encrypt master key share when
+  // using this decryption policy.
+  policy_salt: [32]; //bytearray
+
+  // Master key, AES-encrypted with key derived from
+  // salt and keyshares revealed by the following list of
+  // escrow methods identified by UUID.
+  encrypted_master_key: [32]; //bytearray
+
+  // List of escrow methods identified by their UUID.
+  uuid: string[];
+
+@}
+@end example
+@end deffn
+
+@node Managing truth,,Manage policy,Common encodings
+@anchor{rest managing-truth}@anchor{4e}@anchor{rest truth}@anchor{4f}
+@subsubsection Managing truth
+
+
+This API is used by the Anastasis client to deposit @strong{truth} or request 
a (encrypted) @strong{key share} with
+the escrow provider.
+
+An @strong{escrow method} specifies an Anastasis provider and how the user 
should
+authorize themself.  The @strong{truth} API allows the user to provide the
+(encrypted) key share to the respective escrow provider, as well as auxiliary
+data required for such a respective escrow method.
+
+An Anastasis-server may store truth for free for a certain time period, or
+charge per truth operation using GNU Taler.
+
+@anchor{rest post--truth-$UUID}@anchor{50}
+@deffn {HTTP Post} POST /truth/$UUID
+
+Upload a @ref{51,,TruthUploadRequest}-Object according to the policy the 
client created before (see @ref{4b,,RecoveryDocument}).
+If request has been seen before, the server should do nothing, and otherwise 
store the new object.
+
+@strong{Request:}
+
+@*Query Parameters: 
+
+@itemize *
+
+@item 
+@code{timeout_ms=NUMBER} – @emph{Optional.}  If specified, the Anastasis 
server will
+wait up to @code{timeout_ms} milliseconds for completion of the payment before
+sending the HTTP response.  A client must never rely on this behavior, as the
+backend may return a response immediately.
+@end itemize
+
+
+@strong{Response:}
+
+
+@table @asis
+
+@item 204 No 
content@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.5}:
+
+Truth stored successfully.
+
+@item 304 Not 
modified@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5}:
+
+The same truth was previously accepted and stored under this UUID.  The
+Anastasis server must still update the expiration time for the truth when 
returning
+this response code.
+
+@item 402 Payment 
required@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.3}:
+
+This server requires payment to store truth per item.
+See the Taler payment protocol specification for how to pay.
+The response body MAY provide alternative means for payment.
+
+@item 409 
Conflict@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.10}:
+
+The server already has some truth stored under this UUID. The client should 
check that it
+is generating UUIDs with enough entropy.
+
+@item 412 Precondition 
failed@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.13}:
+
+The selected authentication method is not supported on this provider.
+@end table
+
+@strong{Details:}
+@anchor{rest truthuploadrequest}@anchor{51}
+@example
+interface TruthUploadRequest @{
+  // Contains the information of an interface `EncryptedKeyShare`, but simply
+  // as one binary block (in Crockford Base32 encoding for JSON).
+  key_share_data: []; //bytearray
+
+  // Key share method, i.e. "security question", "SMS", "e-mail", ...
+  type: string;
+
+  // Nonce used to compute the (iv,key) pair for encryption of the
+  // encrypted_truth.
+  nonce: [32]; //bytearray
+
+  // Authentication tag of `@w{`}encrypted_truth`@w{`}.
+  aes_gcm_tag: [16]; //bytearray
+
+  // Variable-size truth. After decryption,
+  // this contains the ground truth, i.e. H(challenge answer),
+  // phone number, e-mail address, picture, fingerprint, ...
+  // **base32 encoded**.
+  //
+  // The nonce of the HKDF for this encryption must include the
+  // string "ECT".
+  encrypted_truth: [80]; //bytearray
+
+  // MIME type of truth, i.e. text/ascii, image/jpeg, etc.
+  truth_mime: string;
+
+  // For how many years from now would the client like us to
+  // store the truth?
+  storage_duration_years: Integer;
+
 @}
 @end example
+@end deffn
+
+@anchor{rest get--truth-$UUID[?response=$H_RESPONSE]}@anchor{52}
+@deffn {HTTP Get} GET /truth/$UUID[?response=$H_RESPONSE]
+
+Get the stored encrypted key share. If @code{$H_RESPONSE} is specified by the 
client, the server checks
+if @code{$H_RESPONSE} matches the expected response specified before within 
the @ref{51,,TruthUploadRequest} (see @code{encrypted_truth}).
+Also, the user has to provide the correct @emph{truth_encryption_key} with 
every get request (see below).
+When @code{$H_RESPONSE} is correct, the server responds with the encrypted key 
share.
+The encrypted key share is returned simply as a byte array and not in JSON 
format.
+
+@strong{Response}:
+
+
+@table @asis
+
+@item 200 
OK@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.1}:
+
+@ref{53,,EncryptedKeyShare} is returned in body (in binary).
+
+@item 202 
Accepted@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.3}:
+
+The escrow provider will respond out-of-band (i.e. SMS).
+The body may contain human-readable instructions on next steps.
+
+@item >>208 Already Reported<<:
+
+An authentication challenge was recently send, client should
+simply respond to the pending challenge.
+
+@item 303 See 
other@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.4}:
+
+The provider redirects for authentication (i.e. video identification/WebRTC).
+If the client is not a browser, it should launch a browser at the URL
+given in the @code{Location} header and allow the user to re-try the operation
+after successful authorization.
+
+@item 402 Payment 
required@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.3}:
+
+The service requires payment for access to truth.
+See the Taler payment protocol specification for how to pay.
+The response body MAY provide alternative means for payment.
+
+@item 403 
Forbidden@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.4}:
+
+The server requires a valid “response” to the challenge associated with the 
UUID.
+
+@item 404 Not 
found@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.5}:
+
+The server does not know any truth under the given UUID.
+
+@item 410 
Gone@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.11}:
+
+The server has not (recently) issued a challenge under the given UUID,
+but a reply was provided. (This does not apply for secure question.)
+
+@item 417 Expectation 
Failed@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.18}:
+
+The decrypted @code{truth} does not match the expectations of the 
authentication
+backend, i.e. a phone number for sending an SMS is not a number, or
+an e-mail address for sending an E-mail is not a valid e-mail address.
+
+@item 503 Service 
Unavailable@footnote{http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.4}:
+
+Server is out of Service.
+@end table
+
+@emph{Truth-Decryption-Key}: Key used to encrypt the @strong{truth} (see 
encrypted_truth within @ref{51,,TruthUploadRequest}) and which has to provided 
by the user. The key is stored with
+the according @ref{4c,,EscrowMethod}. The server needs this key to get the 
info out of @ref{51,,TruthUploadRequest} needed to verify the @code{$RESPONSE}.
+
+@strong{Details:}
+@anchor{rest encryptedkeyshare}@anchor{53}
+@example
+interface EncryptedKeyShare @{
+  // Nonce used to compute the decryption (iv,key) pair.
+  nonce_i: [32]; //bytearray
+
+  // Authentication tag.
+  aes_gcm_tag_i: [16]; //bytearray
+
+  // Encrypted key-share in base32 encoding.
+  // After decryption, this yields a `KeyShare`.  Note that
+  // the `KeyShare` MUST be encoded as a fixed-size binary
+  // block (instead of in JSON encoding).
+  //
+  // HKDF for the key generation must include the
+  // string "eks" as salt.
+  // Depending on the method,
+  // the HKDF may additionally include
+  // bits from the response (i.e. some hash over the
+  // answer to the security question).
+  encrypted_key_share_i: [32]; //bytearray
+
+@}
+@end example
+@anchor{rest keyshare}@anchor{54}
+@example
+interface KeyShare @{
+  // Key material to concatenate with policy_salt and KDF to derive
+  // the key to decrypt the master key.
+  key_share: [32]; //bytearray
+
+  // Signature over method, UUID, and `@w{`}key_share`@w{`}.
+  account_sig: EddsaSignature;
+
+@}
+@end example
+@end deffn
+
+@c This file is part of Anastasis
+@c Copyright (C) 2019-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero General Public License as published by the Free 
Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
+@c @author Dominik Meister
+@c @author Dennis Neufeld
+
+@node Reducer API,Authentication Methods,REST API,Documentation Overview
+@anchor{reducer doc}@anchor{55}@anchor{reducer reducer-api}@anchor{56}
+@section Reducer API
+
+
+This section describes the Anastasis Reducer API which is used by client 
applications
+to store or load the different states the client application can have.
+The reducer takes a @ref{57,,state} in JSON syntax and returns the new state 
in JSON syntax.
+
+For example a @strong{state} may take the following structure:
+
+@example
+@{
+  "backup_state": "CONTINENT_SELECTING",
+  "continents": [
+    "Europe",
+    "North_America"
+  ]
+@}
+@end example
+
+The new state depends on the previous one and on the transition 
@ref{58,,action} with its
+arguments given to the reducer. A @strong{transition argument} also is a 
statement in JSON syntax:
+
+@example
+@{
+  "continent": "Europe"
+@}
+@end example
+
+The new state returned by the reducer with the state and transition argument 
defined
+above would look like following for the transition @ref{58,,action} 
@code{select_continent}:
+
+@example
+@{
+  "backup_state": "COUNTRY_SELECTING",
+  "continents": [
+    "Europe",
+    "North_America"
+  ],
+  "selected_continent": "Europe",
+  "countries": [
+    @{
+      "code": "ch",
+      "name": "Switzerland",
+      "continent": "Europe",
+      "name_i18n": @{
+        "de_DE": "Schweiz",
+        "de_CH": "Schwiiz",
+        "fr": "Suisse",
+        "en": "Swiss"
+      @},
+      "currency": "CHF"
+    @},
+    @{
+      "code": "de",
+      "name": "Germany",
+      "continent": "Europe",
+      "continent_i18n": @{
+        "de": "Europa"
+      @},
+      "name_i18n": @{
+        "de_DE": "Deutschland",
+        "de_CH": "Deutschland",
+        "fr": "Allemagne",
+        "en": "Germany"
+      @},
+      "currency": "EUR"
+    @}
+  ]
+@}
+@end example
+
+@menu
+* States:: 
+* Backup Reducer:: 
+* Recovery Reducer:: 
+* Reducer transitions:: 
+
+@end menu
+
+@node States,Backup Reducer,,Reducer API
+@anchor{reducer states}@anchor{59}
+@subsection States
+
+
+Overall, the reducer knows the following states:
+
+@quotation
+
+
+@itemize -
+
+@item 
+
+@table @asis
+
+@item @strong{ERROR}: The transition led to an error. No further transitions 
are possible from
+
+this state, but the client may want to continue from a previous state.
+@end table
+
+@item 
+
+@table @asis
+
+@item @strong{CONTINENT_SELECTING}: The user should specify the continent 
where they are living,
+
+so that we can show a list of countries to choose from.
+@end table
+
+@item 
+
+@table @asis
+
+@item @strong{COUNTRY_SELECTING}: The user should specify the country where 
they are living,
+
+so that we can determine appropriate attributes, currencies and Anastasis
+providers.
+@end table
+
+@item 
+
+@table @asis
+
+@item @strong{USER_ATTRIBUTES_COLLECTING}: The user should provide the 
country-specific personal
+
+attributes.
+@end table
+
+@item 
+
+@table @asis
+
+@item @strong{AUTHENTICATIONS_EDITING}: The user should add authentication 
methods to be used
+
+during recovery.
+@end table
+
+@item 
+@strong{POLICIES_REVIEWING}: The user should review the recovery policies.
+
+@item 
+@strong{SECRET_EDITING}: The user should edit the secret to be backed up.
+
+@item 
+
+@table @asis
+
+@item @strong{TRUTHS_PAYING}: The user needs to pay for one or more uploads of 
data associated
+
+with an authentication method.
+@end table
+
+@item 
+@strong{POLICIES_PAYING}: The user needs to pay for storing the recovery 
policy document.
+
+@item 
+@strong{BACKUP_FINISHED}: A backup has been successfully generated.
+
+@item 
+
+@table @asis
+
+@item @strong{SECRET_SELECTING}: The user needs to select a recovery policy 
document with
+
+the secret that is to be recovered.
+@end table
+
+@item 
+
+@table @asis
+
+@item @strong{CHALLENGE_SELECTING}: The user needs to select an authorization 
challenge to
+
+proceed with recovery.
+@end table
+
+@item 
+@strong{CHALLENGE_PAYING}: The user needs to pay to proceed with the 
authorization challenge.
+
+@item 
+@strong{CHALLENGE_SOLVING}: The user needs to solve the authorization 
challenge.
+
+@item 
+@strong{RECOVERY_FINISHED}: The secret of the user has been recovered.
+@end itemize
+@end quotation
+
+State names:
+
+@quotation
+
+
+@itemize -
+
+@item 
+In SELECTING-states, the user has to choose one value out of a predefined set 
of values (for example a continent out of a set of continents).
+
+@item 
+In COLLECTING-states, the user has to give certain values.
+
+@item 
+In EDITING-states, the user is free to choose which values he wants to give.
+
+@item 
+In REVEIWING-states, the user may make a few choices, but primarily is 
expected to affirm something.
+
+@item 
+in PAYING-states, the user must make a payment.
+
+@item 
+in FINISHED-states, the operation has definitively concluded.
+@end itemize
+@end quotation
+
+@node Backup Reducer,Recovery Reducer,States,Reducer API
+@anchor{reducer backup-reducer}@anchor{5a}
+@subsection Backup Reducer
+
+@anchor{reducer state}@anchor{57}@anchor{reducer action}@anchor{58}
+
+@float Figure
+
+@image{anastasis-figures/anastasis_reducer_backup,,,fig-anastasis_reducer_backup,png}
+
+@caption{Backup states and their transitions.}
+
+@end float
+
+
+The illustration above shows the different states the reducer can have during 
a backup
+process.
+
+@node Recovery Reducer,Reducer transitions,Backup Reducer,Reducer API
+@anchor{reducer recovery-reducer}@anchor{5b}
+@subsection Recovery Reducer
+
+
+
+@float Figure
+
+@image{anastasis-figures/anastasis_reducer_recovery,,,fig-anastasis_reducer_recovery,png}
+
+@caption{Recovery states and their transitions.}
+
+@end float
+
+
+The illustration above shows the different states the reducer can have during 
a recovery
+process.
+
+@node Reducer transitions,,Recovery Reducer,Reducer API
+@anchor{reducer reducer-transitions}@anchor{5c}
+@subsection Reducer transitions
+
+
+In the following, the individual transitions will be specified in more detail.
+Note that we only show fields added by the reducer, typically the previous
+state is preserved to enable “back” transitions to function smoothly.
+
+@menu
+* Initial state:: 
+* Common transitions:: 
+* Backup transitions:: 
+* Recovery transitions:: 
+
+@end menu
+
+@node Initial state,Common transitions,,Reducer transitions
+@anchor{reducer initial-state}@anchor{5d}
+@subsubsection Initial state
+
+
+The initial states for backup and recovery processes are:
+
+@strong{Initial backup state:}
+
+@example
+@{
+  "backup_state": "CONTINENT_SELECTING",
+  "continents": [
+    "Europe",
+    "North America"
+  ]
+@}
+@end example
+
+@strong{Initial recovery state:}
+
+@example
+@{
+  "recovery_state": "CONTINENT_SELECTING",
+  "continents": [
+    "Europe",
+    "North America"
+  ]
+@}
+@end example
+
+Here, “continents” is an array of English strings with the names of the
+continents which contain countries for which Anastasis could function (based
+on having providers that are known to operate and rules being provided for
+user attributes from those countries).
+
+For internationalization, another field @code{continents_i18n} may be present.
+This field would be a map of language names to arrays of translated
+continent names:
+
+@example
+@{
+  "recovery_state": "CONTINENT_SELECTING",
+  "continents": [
+    "Europe",
+    "North America"
+  ]
+  "continents_i18n":
+  @{
+    "de_DE" : [
+      "Europa",
+      "Nordamerika"
+      ],
+    "de_CH" : [
+      "Europa",
+      "Nordamerika"
+      ]
+  @}
+@}
+@end example
+
+Translations must be given in the same order as the main English array.
+
+@node Common transitions,Backup transitions,Initial state,Reducer transitions
+@anchor{reducer common-transitions}@anchor{5e}
+@subsubsection Common transitions
+
+
+@strong{select_continent:}
+
+Here the user specifies the continent they live on.  Arguments (example):
+
+@example
+@{
+  "continent": "Europe"
+@}
+@end example
+
+The continent must be given using the English name from the @code{continents} 
array.
+Using a translated continent name is invalid and may result in failure.
+
+The reducer returns an updated state with a list of countries to choose from,
+for example:
+
+@example
+@{
+  "backup_state": "COUNTRY_SELECTING",
+  "selected_continent": "Europe",
+  "countries": [
+    @{
+      "code": "ch",
+      "name": "Switzerland",
+      "continent": "Europe",
+      "name_i18n": @{
+        "de_DE": "Schweiz",
+        "de_CH": "Schwiiz",
+        "fr": "Suisse",
+        "en": "Swiss"
+      @},
+      "currency": "CHF"
+    @},
+    @{
+      "code": "de",
+      "name": "Germany",
+      "continent": "Europe",
+      "continent_i18n": @{
+        "de": "Europa"
+      @},
+      "name_i18n": @{
+        "de_DE": "Deutschland",
+        "de_CH": "Deutschland",
+        "fr": "Allemagne",
+        "en": "Germany"
+      @},
+      "currency": "EUR"
+    @}
+  ]
+@}
+@end example
+
+Here @code{countries} is an array of countries on the 
@code{selected_continent}.  For
+each country, the @code{code} is the ISO 3166-1 alpha-2 country code.  The
+@code{continent} is only present because some countries span continents, the
+information is redundant and will always match @code{selected_continent}.  The
+@code{name} is the name of the country in English, internationalizations of the
+name may be provided in @code{name_i18n}.  The @code{currency} is @strong{an} 
official
+currency of the country, if a country has multiple currencies, it may appear
+multiple times in the list.  In this case, the user should select the entry
+with the currency they intend to pay with.  It is also possible for users
+to select a currency that does not match their country, but user interfaces
+should by default try to use currencies that match the user’s residence.
+
+@strong{select_country:}
+
+Selects the country (via the country code) and specifies the currency.
+The latter is needed as some countries have more than one currency,
+and some use-cases may also involve users insisting on paying with
+foreign currency.
+
+Arguments (example):
+
+@example
+@{
+  "country_code": "de",
+  "currency": "EUR"
+@}
+@end example
+
+The @code{country_code} must be an ISO 3166-1 alpha-2 country code from
+the array of @code{countries} of the reducer’s state.  The @code{currency}
+field must be a valid currency accepted by the Taler payment system.
+
+The reducer returns a new state with the list of attributes the
+user is expected to provide, as well as possible authentication
+providers that accept payments in the selected currency:
+
+@example
+@{
+  "backup_state": "USER_ATTRIBUTES_COLLECTING",
+  "selected_country": "de",
+  "currency": "EUR",
+  "required_attributes": [
+    @{
+      "type": "string",
+      "name": "full_name",
+      "label": "Full name",
+      "label_i18n": @{
+        "de_DE": "Vollstaendiger Name",
+        "de_CH": "Vollstaendiger. Name",
+        "fr": "Nom complet",
+        "en": "Full name"
+      @},
+      "widget": "anastasis_gtk_ia_full_name",
+      "uuid" : "9e8f463f-575f-42cb-85f3-759559997331"
+    @},
+    @{
+      "type": "date",
+      "name": "birthdate",
+      "label": "Birthdate",
+      "label_i18n": @{
+        "de_DE": "Geburtsdatum",
+        "de_CH": "Geburtsdatum",
+        "fr": "Date de naissance",
+        "en": "Birthdate"
+      @},
+      "uuid" : "83d655c7-bdb6-484d-904e-80c1058c8854"
+      "widget": "anastasis_gtk_ia_birthdate"
+    @},
+        @{
+           "type": "string",
+       "name": "tax_number",
+           "label": "Taxpayer identification number",
+           "label_i18n":@{
+                 "de_DE": "Steuerliche Identifikationsnummer",
+                 "de_CH": "Steuerliche Identifikationsnummer",
+                 "en": "German taxpayer identification number"
+           @},
+           "widget": "anastasis_gtk_ia_tax_de",
+       "uuid": "dae48f85-e3ff-47a4-a4a3-ed981ed8c3c6",
+           "validation-regex": "^[0-9]@{11@}$",
+           "validation-logic": "DE_TIN_check"
+        @},
+    @{
+      "type": "string",
+      "name": "social_security_number",
+      "label": "Social security number",
+      "label_i18n": @{
+        "de_DE": "Sozialversicherungsnummer",
+        "de_CH": "Sozialversicherungsnummer",
+        "fr": "Numéro de sécurité sociale",
+        "en": "Social security number"
+      @},
+      "widget": "anastasis_gtk_ia_ssn",
+          "validation-regex": "^[0-9]@{8@}[[:upper:]][0-9]@{3@}$",
+          "validation-logic": "DE_SVN_check"
+      "optional" : true
+  @}
+  ],
+  "authentication_providers": @{
+    "http://localhost:8089/": @{
+      "http_status": 200,
+      "methods": [
+        @{ "type" : "question",
+          "usage_fee" : "EUR:0.0" @},
+        @{ "type" : "sms",
+          "usage_fee" : "EUR:0.5" @}
+      ],
+      "annual_fee": "EUR:4.99",
+      "truth_upload_fee": "EUR:4.99",
+      "liability_limit": "EUR:1",
+      "currency": "EUR",
+      "truth_lifetime": @{ "d_ms" : 50000000 @},
+      "storage_limit_in_megabytes": 1,
+      "provider_name": "Anastasis 4",
+      "salt": "CXAPCKSH9D3MYJTS9536RHJHCW"
+    @},
+    "http://localhost:8088/": @{
+      "http_status": 200,
+      "methods": [
+        @{ "type" : "question",
+          "usage_fee" : "EUR:0.01" @},
+        @{ "type" : "sms",
+          "usage_fee" : "EUR:0.55" @}
+      ],
+      "annual_fee": "EUR:0.99",
+      "truth_upload_fee": "EUR:3.99",
+      "liability_limit": "EUR:1",
+      "currency": "EUR",
+      "truth_lifetime": @{ "d_ms" : 50000000 @},
+      "storage_limit_in_megabytes": 1,
+      "provider_name": "Anastasis 4",
+      "salt": "CXAPCKSH9D3MYJTS9536RHJHCW"
+    @}
+  @}
+@}
+@end example
+
+The array of @code{required_attributes} contains attributes about the user
+that must be provided includes:
+
+@quotation
+
+
+@itemize -
+
+@item 
+@strong{type}: The type of the attribute, for now only @code{string} and 
@code{date} are
+supported.
+
+@item 
+@strong{name}: The name of the attribute, this is the key under which the
+attribute value must be provided later. The name must be unique per response.
+
+@item 
+@strong{label}: A human-readable description of the attribute in English.
+Translated descriptions may be provided under @strong{label_i18n}.
+
+@item 
+@strong{uuid}: A UUID that uniquely identifies identical attributes across
+different countries. Useful to preserve values should the user enter
+some attributes, and then switch to another country.  Note that
+attributes must not be preserved if they merely have the same @strong{name},
+only the @strong{uuid} will be identical if the semantics is identical.
+
+@item 
+@strong{widget}: An optional name of a widget that is known to nicely render
+the attribute entry in user interfaces where named widgets are
+supported.
+
+@item 
+@strong{validation-regex}: An optional extended POSIX regular expression
+that is to be used to validate (string) inputs to ensure they are
+well-formed.
+
+@item 
+@strong{validation-logic}: Optional name of a function that should be called
+to validate the input.  If the function is not known to the particular
+client, the respective validation can be skipped (at the expense of
+typos by users not being detected, possibly rendering secrets
+irrecoverable).
+
+@item 
+@strong{optional}: Optional boolean field that, if @code{true}, indicates that
+this attribute is not actually required but optional and users MAY leave
+it blank in case they do not have the requested information. Used for
+common fields that apply to some large part of the population but are
+not sufficiently universal to be actually required.
+@end itemize
+@end quotation
+
+The authentication providers are listed under a key that is the
+base URL of the service. For each provider, the following
+information is provided if the provider was successfully contacted:
+
+@quotation
+
+
+@itemize -
+
+@item 
+@strong{http_status}: HTTP status code, always @code{200} on success.
+
+@item 
+@strong{methods}: Array of authentication methods supported by this
+provider. Includes the @strong{type} of the authentication method
+and the @strong{usage_fee} (how much the user must pay for authorization
+using this method during recovery).
+
+@item 
+@strong{annual_fee}: Fee the provider charges to store the recovery
+policy for one year.
+
+@item 
+@strong{truth_upload_fee}: Fee the provider charges to store a key share.
+
+@item 
+@strong{liability_limit}: Amount the provider can be held liable for in
+case a key share or recovery document cannot be recovered due to
+provider failures.
+
+@item 
+@strong{currency}: Currency in which the provider wants to be paid,
+will match all of the fees.
+
+@item 
+@strong{storage_limit_in_megabytes}: Maximum size of an upload (for
+both recovery document and truth data) in megabytes.
+
+@item 
+@strong{provider_name}: Human-readable name of the provider’s business.
+
+@item 
+@strong{salt}: Salt value used by the provider, used to derive the
+user’s identity at this provider. Should be unique per provider,
+and must never change for a given provider.  The salt is
+base32 encoded.
+@end itemize
+@end quotation
+
+If contacting the provider failed, the information returned is:
+
+@quotation
+
+
+@itemize -
+
+@item 
+@strong{http_status}: HTTP status code (if available, possibly 0 if
+we did not even obtain an HTTP response).
+
+@item 
+@strong{error_code}: Taler error code, never 0.
+@end itemize
+@end quotation
+
+@strong{add_provider}:
+
+This operation can be performed in state @code{USER_ATTRIBUTES_COLLECTING}.  It
+adds one or more Anastasis providers to the list of providers the reducer
+should henceforth consider.  Note that removing providers is not possible at
+this time.
+
+Here, the client must provide an array with the base URLs of the
+providers to add, for example:
+
+@example
+@{
+  "urls": [
+    "http://localhost:8888/";,
+    "http://localhost:8089/";
+  ]
+@}
+@end example
+
+Note that existing providers will remain in the state.  The following is an
+example for an expected new state where the service on port 8089 is
+unreachable, the service on port 8088 was previously known, and service on
+port 8888 was now added:
+
+@example
+@{
+  "backup_state": "USER_ATTRIBUTES_COLLECTING",
+  "authentication_providers": @{
+    "http://localhost:8089/": @{
+      "error_code": 11,
+      "http_status": 0
+    @},
+    "http://localhost:8088/": @{
+      "http_status": 200,
+      "methods": [
+        @{ "type" : "question",
+          "usage_fee" : "EUR:0.01" @},
+        @{ "type" : "sms",
+          "usage_fee" : "EUR:0.55" @}
+      ],
+      "annual_fee": "EUR:0.99",
+      "truth_upload_fee": "EUR:3.99",
+      "liability_limit": "EUR:1",
+      "currency": "EUR",
+      "truth_lifetime": @{ "d_ms" : 50000000 @},
+      "storage_limit_in_megabytes": 1,
+      "provider_name": "Anastasis 4",
+      "salt": "CXAPCKSH9D3MYJTS9536RHJHCW"
+    @}
+    "http://localhost:8888/": @{
+      "methods": [
+        @{ "type" : "question",
+          "usage_fee" : "EUR:0.01" @},
+        @{ "type" : "sms",
+          "usage_fee" : "EUR:0.55" @}
+      ],
+      "annual_fee": "EUR:0.99",
+      "truth_upload_fee": "EUR:3.99",
+      "liability_limit": "EUR:1",
+      "currency": "EUR",
+      "truth_lifetime": @{ "d_ms" : 50000000 @},
+      "storage_limit_in_megabytes": 1,
+      "provider_name": "Anastasis 42",
+      "salt": "BXAPCKSH9D3MYJTS9536RHJHCX"
+    @}
+  @}
+@}
+@end example
+
+@node Backup transitions,Recovery transitions,Common transitions,Reducer 
transitions
+@anchor{reducer backup-transitions}@anchor{5f}
+@subsubsection Backup transitions
+
+
+@strong{enter_user_attributes:}
+
+This transition provides the user’s personal attributes. The specific set of
+attributes required depends on the country of residence of the user.  Some
+attributes may be optional, in which case they should be omitted entirely
+(that is, not simply be set to @code{null} or an empty string).  Example
+arguments would be:
+
+@example
+@{
+  "identity_attributes": @{
+    "full_name": "Max Musterman",
+    "social_security_number": "123456789",
+    "birthdate": "2000-01-01",
+    "birthplace": "Earth"
+ @}
+@}
+@end example
+
+Note that at this stage, the state machines between backup and
+recovery diverge and the @code{recovery_state} will begin to look
+very different from the @code{backup_state}.
+
+For backups, if all required attributes are present, the reducer will
+transition to an @code{AUTHENTICATIONS_EDITING} state with the attributes added
+to it:
+
+@example
+@{
+  "backup_state": "AUTHENTICATIONS_EDITING",
+  "identity_attributes": @{
+    "full_name": "Max Musterman",
+    "social_security_number": "123456789",
+    "birthdate": "2000-01-01",
+    "birthplace": "Earth"
+  @}
+@}
+@end example
+
+If required attributes are missing, do not match the required regular
+expression, or fail the custom validation logic, the reducer SHOULD transition
+to an error state indicating what was wrong about the input.  A reducer that
+does not support some specific validation logic MAY accept the invalid input
+and proceed anyway.  The error state will include a Taler error code that
+is specific to the failure, and optional details.  Example:
+
+@example
+@{
+  "backup_state": "ERROR",
+  "code": 8404,
+  "hint": "An input did not match the regular expression.",
+  "detail": "social_security_number"
+@}
+@end example
+
+Clients may safely repeat this transition to validate the user’s inputs
+until they satisfy all of the constraints.  This way, the user interface
+does not have to perform the input validation directly.
+
+@strong{add_authentication}:
+
+This transition adds an authentication method.  The method must be supported
+by one or more providers that are included in the current state.  Adding an
+authentication method requires specifying the @code{type} and 
@code{instructions} to
+be given to the user.  The @code{challenge} is encrypted and stored at the
+Anastasis provider. The specific semantics of the value depend on the
+@code{type}.  Typical challenges values are a phone number (to send an SMS to),
+an e-mail address (to send a PIN code to) or the answer to a security
+question.  Note that these challenge values will still be encrypted (and
+possibly hashed) before being given to the Anastasis providers.
+
+Note that the @code{challenge} must be given in Crockford Base32 encoding, as 
it
+MAY include binary data (such as a photograph of the user).  In the latter
+case, the optional @code{mime_type} field must be provided to give the MIME 
type
+of the value encoded in @code{challenge}.
+
+@example
+@{
+  "authentication_method":
+  @{
+    "type": "question",
+    "mime_type" : "text/plain",
+    "instructions" : "What is your favorite GNU package?",
+    "challenge" : "E1QPPS8A",
+  @}
+@}
+@end example
+
+If the information provided is valid, the reducer will add the new
+authentication method to the array of authentication methods:
+
+@example
+@{
+  "backup_state": "AUTHENTICATIONS_EDITING",
+  "authentication_methods": [
+    @{
+      "type": "question",
+      "mime_type" : "text/plain",
+      "instructions" : "What is your favorite GNU package?",
+      "challenge" : "E1QPPS8A",
+    @},
+    @{
+      "type": "email",
+      "instructions" : "E-mail to user@@*le.com",
+      "challenge": "ENSPAWJ0CNW62VBGDHJJWRVFDM50"
+    @}
+  ]
+@}
+@end example
+
+@strong{delete_authentication}:
+
+This transition can be used to remove an authentication method from the
+array of authentication methods. It simply requires the index of the
+authentication method to remove. Note that the array is 0-indexed:
+
+@example
+@{
+  "authentication_method": 1
+@}
+@end example
+
+Assuming we begin with the state from the example above, this would
+remove the @code{email} authentication method, resulting in the following
+response:
+
+@example
+@{
+  "backup_state": "AUTHENTICATIONS_EDITING",
+  "authentication_methods": [
+    @{
+      "type": "question",
+      "mime_type" : "text/plain",
+      "instructions" : "What is your favorite GNU package?",
+      "challenge" : "gdb",
+    @}
+  ]
+@}
+@end example
+
+If the index is invalid, the reducer will instead
+transition into an @code{ERROR} state.
+
+@strong{next} (from @code{AUTHENTICATIONS_EDITING}):
+
+This transition confirms that the user has finished adding (or removing)
+authentication methods, and that the system should now automatically compute
+a set of reasonable recovery policies.
+
+This transition does not take any mandatory arguments.  Optional arguments can
+be provided to upload the recovery document only to a specific subset of the
+providers:
+
+@example
+@{
+  "providers": [
+    "http://localhost:8088/";,
+    "http://localhost:8089/";
+  ]
+@}
+@end example
+
+The resulting state provides the suggested recovery policies in a way suitable
+for presentation to the user:
+
+@example
+@{
+  "backup_state": "POLICIES_REVIEWING",
+  "policy_providers" : [
+      @{ "provider_url" : "http://localhost:8088/"; @},
+      @{ "provider_url" : "http://localhost:8089/"; @}
+  ],
+  "policies": [
+    @{
+      "methods": [
+        @{
+          "authentication_method": 0,
+          "provider": "http://localhost:8088/";
+        @},
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 2,
+          "provider": "http://localhost:8087/";
+        @}
+      ]
+    @},
+    @{
+      "methods": [
+        @{
+          "authentication_method": 0,
+          "provider": "http://localhost:8088/";
+        @},
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 3,
+          "provider": "http://localhost:8089/";
+        @}
+      ]
+    @}
+  ]
+@}
+@end example
+
+For each recovery policy, the state includes the specific details of which
+authentication @code{methods} must be solved to recovery the secret using this
+policy.  The @code{methods} array specifies the index of the
+@code{authentication_method} in the @code{authentication_methods} array, as 
well as
+the provider that was selected to supervise this authentication.
+
+If no authentication method was provided, the reducer will transition into an
+@code{ERROR} state instead of suggesting policies.
+
+@strong{add_policy}:
+
+Using this transition, the user can add an additional recovery policy to the
+state.  The argument format is the same that is used in the existing state.
+An example for a possible argument would thus be:
+
+@example
+@{
+  "policy": [
+    @{
+      "authentication_method": 1,
+      "provider": "http://localhost:8088/";
+    @},
+    @{
+      "authentication_method": 3,
+      "provider": "http://localhost:8089/";
+    @}
+  ]
+@}
+@end example
+
+Note that the specified providers must already be in the
+@code{authentication_providers} of the state. You cannot add new providers at
+this stage.  The reducer will simply attempt to append the suggested policy to
+the “policies” array, returning an updated state:
+
+@example
+@{
+  "backup_state": "POLICIES_REVIEWING",
+  "policies": [
+    @{
+      "methods": [
+        @{
+          "authentication_method": 0,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8088/";
+        @}
+      ]
+    @},
+    @{
+      "methods": [
+        @{
+          "authentication_method": 0,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 2,
+          "provider": "http://localhost:8088/";
+        @}
+      ]
+    @},
+    @{
+      "methods": [
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 2,
+          "provider": "http://localhost:8088/";
+        @}
+      ]
+    @},
+    @{
+      "methods": [
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8088/";
+        @},
+        @{
+          "authentication_method": 3,
+          "provider": "http://localhost:8089/";
+        @}
+      ]
+    @}
+  ]
+@}
+@end example
+
+If the new policy is invalid, for example because it adds an unknown
+authentication method, or the selected provider does not support the type of
+authentication, the reducer will transition into an @code{ERROR} state instead 
of
+adding the new policy.
+
+@strong{update_policy}:
+
+Using this transition, the user can modify an existing recovery policy
+in the state.
+The argument format is the same that is used in @strong{add_policy},
+except there is an additional key @code{policy_index} which
+identifies the policy to modify.
+An example for a possible argument would thus be:
+
+@example
+@{
+  "policy_index" : 1,
+  "policy": [
+    @{
+      "authentication_method": 1,
+      "provider": "http://localhost:8088/";
+    @},
+    @{
+      "authentication_method": 3,
+      "provider": "http://localhost:8089/";
+    @}
+  ]
+@}
+@end example
+
+If the new policy is invalid, for example because it adds an unknown
+authentication method, or the selected provider does not support the type of
+authentication, the reducer will transition into an @code{ERROR} state instead 
of
+modifying the policy.
+
+@strong{delete_policy:}
+
+This transition allows the deletion of a recovery policy. The argument
+simply specifies the index of the policy to delete, for example:
+
+@example
+@{
+  "policy_index": 3
+@}
+@end example
+
+Given as input the state from the example above, the expected new state would
+be:
+
+@example
+@{
+  "backup_state": "POLICIES_REVIEWING",
+  "policies": [
+    @{
+      "methods": [
+        @{
+          "authentication_method": 0,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8088/";
+        @}
+      ]
+    @},
+    @{
+      "methods": [
+        @{
+          "authentication_method": 0,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 2,
+          "provider": "http://localhost:8088/";
+        @}
+      ]
+    @},
+    @{
+      "methods": [
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 2,
+          "provider": "http://localhost:8088/";
+        @}
+      ]
+    @}
+  ]
+@}
+@end example
+
+If the index given is invalid, the reducer will transition into an 
@code{ERROR} state
+instead of deleting a policy.
+
+@strong{delete_challenge:}
+
+This transition allows the deletion of an individual
+challenge from a recovery policy. The argument
+simply specifies the index of the policy and challenge
+to delete, for example:
+
+@example
+@{
+  "policy_index": 1,
+  "challenge_index" : 1
+@}
+@end example
+
+Given as input the state from the example above, the expected new state would
+be:
+
+@example
+@{
+  "backup_state": "POLICIES_REVIEWING",
+  "policies": [
+    @{
+      "methods": [
+        @{
+          "authentication_method": 0,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8088/";
+        @}
+      ]
+    @},
+    @{
+      "methods": [
+        @{
+          "authentication_method": 0,
+          "provider": "http://localhost:8089/";
+        @}
+      ]
+    @},
+    @{
+      "methods": [
+        @{
+          "authentication_method": 1,
+          "provider": "http://localhost:8089/";
+        @},
+        @{
+          "authentication_method": 2,
+          "provider": "http://localhost:8088/";
+        @}
+      ]
+    @}
+  ]
+@}
+@end example
+
+If the index given is invalid, the reducer will transition into an 
@code{ERROR} state
+instead of deleting a challenge.
+
+@strong{next} (from @code{POLICIES_REVIEWING}):
+
+Using this transition, the user confirms that the policies in the current
+state are acceptable. The transition does not take any arguments.
+
+The reducer will simply transition to the @code{SECRET_EDITING} state:
+
+@example
+@{
+  "backup_state": "SECRET_EDITING",
+  "upload_fees" : [ "KUDOS:42" ],
+  "expiration" : @{ "t_ms" : 1245362362 @}
+@}
+@end example
+
+Here, @code{upload_fees} is an array of applicable upload fees for the
+given policy expiration time. This is an array because fees could
+be in different currencies.  The final cost may be lower if the
+user already paid for some of the time.
+
+If the array of @code{policies} is currently empty, the reducer will transition
+into an @code{ERROR} state instead of allowing the user to continue.
+
+@strong{enter_secret:}
+
+This transition provides the reducer with the actual core @code{secret} of the 
user
+that Anastasis is supposed to backup (and possibly recover). The argument is
+simply the Crockford-Base32 encoded @code{value} together with its @code{mime} 
type, or a @code{text} field with a human-readable secret text.
+For example:
+
+@example
+@{
+  "secret": @{
+     "value": "EDJP6WK5EG50",
+     "mime" : "text/plain"
+  @},
+  "expiration" : @{ "t_ms" : 1245362362 @}
+@}
+@end example
+
+If the application is unaware of the format, it set the @code{mime} field to 
@code{null}.
+The @code{expiration} field is optional.
+
+The reducer remains in the @code{SECRET_EDITING} state, but now the secret and
+updated expiration time are part of the state and the cost calculations will
+be updated.
+
+@example
+@{
+  "backup_state": "SECRET_EDITING",
+  "core_secret" : @{
+     "value": "EDJP6WK5EG50",
+     "mime" : "text/plain"
+  @},
+  "expiration" : @{ "t_ms" : 1245362362 @},
+  "upload_fees" : [ "KUDOS:42" ]
+@}
+@end example
+
+@strong{clear_secret:}
+
+This transition removes the core secret from the state.  It is simply a
+convenience function to undo @code{enter_secret} without providing a new value
+immediately. The transition takes no arguments.  The resuting state will no
+longer have the @code{core_secret} field, and be otherwise unchanged. Calling
+@strong{clear_secret} on a state without a @code{core_secret} will result in 
an error.
+
+@strong{enter_secret_name:}
+
+This transition provides the reducer with a name for the core @code{secret} of 
the user. This name will be given to the user as a hint when seleting a 
recovery policy document during recovery, prior to satisfying any of the 
challenges. The argument simply contains the name for the secret.
+Applications that have build-in support for Anastasis MUST prefix the
+secret name with an underscore and an application-specific identifier
+registered in GANA so that they can use recognize their own backups.
+An example argument would be:
+
+@example
+@{
+  "name": "_TALERWALLET_MyPinePhone",
+@}
+@end example
+
+Here, @code{MyPinePhone} might be chosen by the user to identify the
+device that was being backed up.
+
+The reducer remains in the @code{SECRET_EDITING} state, but now the
+secret name is updated:
+
+@example
+@{
+  "secret_name" : "_TALERWALLET_MyPinePhone"
+@}
+@end example
+
+@strong{update_expiration:}
+
+This transition asks the reducer to change the desired expiration time
+and to update the associated cost. For example:
+
+@example
+@{
+  "expiration" : @{ "t_ms" : 1245362362 @}
+@}
+@end example
+
+The reducer remains in the @code{SECRET_EDITING} state, but the
+expiration time and cost calculation will be updated.
+
+@example
+@{
+  "backup_state": "SECRET_EDITING",
+  "expiration" : @{ "t_ms" : 1245362362 @},
+  "upload_fees" : [ @{ "fee": "KUDOS:43" @} ]
+@}
+@end example
+
+@strong{next} (from @code{SECRET_EDITING}):
+
+Using this transition, the user confirms that the secret and expiration
+settings in the current state are acceptable. The transition does not take any
+arguments.
+
+If the secret is currently empty, the reducer will transition into an
+@code{ERROR} state instead of allowing the user to continue.
+
+After adding a secret, the reducer may transition into different states
+depending on whether payment(s) are necessary.  If payments are needed, the
+@code{secret} will be stored in the state under @code{core_secret}.  
Applications
+should be careful when persisting the resulting state, as the 
@code{core_secret}
+is not protected in the @code{PAYING} states.  The @code{PAYING} states only 
differ
+in terms of what the payments are for (key shares or the recovery document),
+in all cases the state simply includes an array of Taler URIs that refer to
+payments that need to be made with the Taler wallet.
+
+If all payments are complete, the reducer will transition into the
+@code{BACKUP_FINISHED} state and (if applicable) delete the @code{core_secret} 
as an
+additional safety measure.
+
+Example results are thus:
+
+@example
+@{
+  "backup_state": "TRUTHS_PAYING",
+  "secret_name" : "$NAME",
+  "core_secret" : @{ "$anything":"$anything" @},
+  "payments": [
+    "taler://pay/...",
+    "taler://pay/..."
+  ]
+@}
+@end example
+
+@example
+@{
+  "backup_state": "POLICIES_PAYING",
+  "secret_name" : "$NAME",
+  "core_secret" : @{ "$anything":"$anything" @},
+  "payments": [
+    "taler://pay/...",
+    "taler://pay/..."
+  ]
+@}
+@end example
+
+@example
+@{
+  "backup_state": "BACKUP_FINISHED",
+@}
+@end example
+
+@strong{pay:}
+
+This transition suggests to the reducer that a payment may have been made or
+is immanent, and that the reducer should check with the Anastasis service
+provider to see if the operation is now possible.  The operation takes one
+optional argument, which is a @code{timeout} value that specifies how long the
+reducer may wait (in long polling) for the payment to complete:
+
+@example
+@{
+  "timeout":  @{ "d_ms" : 5000 @},
+@}
+@end example
+
+The specified timeout is passed on to the Anastasis service provider(s), which
+will wait this long before giving up.  If no timeout is given, the check is
+done as quickly as possible without additional delays.  The reducer will 
continue
+to either an updated state with the remaining payment requests, to the
+@code{BACKUP_FINISHED} state (if all payments have been completed and the 
backup
+finished), or into an @code{ERROR} state in case there was an irrecoverable 
error,
+indicating the specific provider and how it failed.  An example for this
+final error state would be:
+
+@example
+@{
+  "backup_state": "ERROR",
+  "http_status" : 500,
+  "upload_status" : 52,
+  "provider_url" : "https://bad.example.com/";,
+@}
+@end example
+
+Here, the fields have the following meaning:
+
+@quotation
+
+
+@itemize -
+
+@item 
+@strong{http_status} is the HTTP status returned by the Anastasis provider.
+
+@item 
+@strong{upload_status} is the Taler error code return by the provider.
+
+@item 
+@strong{provider_url} is the base URL of the failing provider.
+@end itemize
+@end quotation
+
+In the above example, 52 would thus imply that the Anastasis provider failed to
+store information into its database.
+
+@node Recovery transitions,,Backup transitions,Reducer transitions
+@anchor{reducer recovery-transitions}@anchor{60}
+@subsubsection Recovery transitions
+
+
+@strong{enter_user_attributes:}
+
+This transition provides the user’s personal attributes. The specific set of
+attributes required depends on the country of residence of the user.  Some
+attributes may be optional, in which case they should be omitted entirely
+(that is, not simply be set to @code{null} or an empty string).  The
+arguments are identical to the @strong{enter_user_attributes} transition from
+the backup process.  Example arguments would thus be:
+
+@example
+@{
+  "identity_attributes": @{
+    "full_name": "Max Musterman",
+    "social_security_number": "123456789",
+    "birthdate": "2000-01-01",
+    "birthplace": "Earth"
+  @}
+@}
+@end example
+
+However, in contrast to the backup process, the reducer will attempt to
+retrieve the latest recovery document from all known providers for the
+selected currency given the above inputs.  If a recovery document was found
+by any provider, the reducer will attempt to load it and transition to
+a state where the user can choose which challenges to satisfy:
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SELECTING",
+  "recovery_information": @{
+    "challenges": [
+      @{
+        "uuid": "MW2R3RCBZPHNC78AW8AKWRCHF9KV3Y82EN62T831ZP54S3K5599G",
+        "cost": "TESTKUDOS:0",
+        "type": "question",
+        "instructions": "q1"
+      @},
+      @{
+        "uuid": "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
+        "cost": "TESTKUDOS:0",
+        "type": "email",
+        "instructions": "e-mail address m?il@@f*.bar"
+      @},
+    ],
+    "policies": [
+      [
+        @{
+          "uuid": "MW2R3RCBZPHNC78AW8AKWRCHF9KV3Y82EN62T831ZP54S3K5599G"
+        @},
+        @{
+          "uuid": "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0"
+        @},
+      ],
+    ],
+    "provider_url": "http://localhost:8088/";,
+    "version": 1,
+  @},
+  "recovery_document": @{
+    "...": "..."
+  @}
+@}
+@end example
+
+The @code{recovery_document} is an internal representation of the recovery
+information and of no concern to the user interface. The pertinent information
+is in the @code{recovery_information}. Here, the @code{challenges} array is a 
list
+of possible challenges the user could attempt to solve next, while 
@code{policies}
+is an array of policies, with each policy being an array of challenges.
+Satisfying all of the challenges of one of the policies will enable the secret
+to be recovered.  The @code{provider_url} from where the recovery document was
+obtained and its @code{version} are also provided.  Each challenge comes with
+four mandatory fields:
+
+@quotation
+
+
+@itemize -
+
+@item 
+@strong{uuid}: A unique identifier of the challenge; this is what the
+UUIDs in the policies array refer to, but also this UUID may be
+included in messages sent to the user. They allow the user to
+distinguish different PIN/TANs should say the same phone number be
+used for SMS-authentication with different providers.
+
+@item 
+@strong{cost}: This is the amount the Anastasis provider will charge
+to allow the user to pass the challenge.
+
+@item 
+@strong{type}: This is the type of the challenge, as a string.
+
+@item 
+@strong{instructions}: Contains additional important hints for the user
+to allow the user to satisfy the challenge.  It typically includes
+an abbreviated form of the contact information or the security
+question. Details depend on @code{type}.
+@end itemize
+@end quotation
+
+If a recovery document was not found, either the user never performed
+a backup, entered incorrect attributes, or used a provider not yet in
+the list of Anastasis providers.  Hence, the user must now either
+select a different provider, or go @code{back} and update the identity
+attributes.  In the case a recovery document was not found, the
+transition fails, returning the error code and a human-readable error
+message together with a transition failure:
+
+@example
+@{
+  "recovery_state": "ERROR",
+  "error_message": "account unknown to Anastasis server",
+  "error_code": 9,
+@}
+@end example
+
+Here, the @code{error_code} is from the @code{enum ANASTASIS_RecoveryStatus}
+and describes precisely what failed about the download, while the
+@code{error_message} is a human-readable (English) explanation of the code.
+Applications may want to translate the message using GNU gettext;
+translations should be available in the @code{anastasis} text domain.
+However, in general it should be sufficient to display the slightly
+more generic Taler error code that is returned with the new state.
+
+@strong{change_version:}
+
+Even if a recovery document was found, it is possible that the user
+intended to recover a different version, or recover a backup where
+the recovery document is stored at a different provider. Thus, the
+reducer allows the user to explicitly switch to a different provider
+or recovery document version using the @code{change_version} transition,
+which takes a provider URL and policy version as arguments:
+
+@example
+@{
+  "provider_url": "https://localhost:8080/";,
+  "version": 2
+@}
+@end example
+
+Note that using a version of 0 implies fetching “the latest version”.  The
+resulting states are the same as those of the @code{enter_user_attributes}
+transition, except that the recovery document version is not necessarily the
+latest available version at the provider.
+
+@strong{select_challenge:}
+
+Selecting a challenge takes different, depending on the state of the payment.
+A comprehensive example for @code{select_challenge} would be:
+
+@example
+@{
+    "uuid": "80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30"
+    "timeout" : @{ "d_ms" : 5000 @},
+    "payment_secret": "3P4561HAMHRRYEYD6CM6J7TS5VTD5SR2K2EXJDZEFSX92XKHR4KG"
+@}
+@end example
+
+The @code{uuid} field is mandatory and specifies the selected challenge.
+The other fields are optional, and are needed in case the user has
+previously been requested to pay for the challenge.  In this case,
+the @code{payment_secret} identifies the previous payment request, and
+@code{timeout} says how long the Anastasis service should wait for the
+payment to be completed before giving up (long polling).
+
+Depending on the type of the challenge and the need for payment, the
+reducer may transition into @code{CHALLENGE_SOLVING} or @code{CHALLENGE_PAYING}
+states.  In @code{CHALLENGE_SOLVING}, the new state will primarily specify
+the selected challenge:
+
+@example
+@{
+  "backup_state": "CHALLENGE_SOLVING",
+  "selected_challenge_uuid": 
"80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30"
+@}
+@end example
+
+In @code{CHALLENGE_PAYING}, the new state will include instructions for payment
+in the @code{challenge_feedback}. In general, @code{challenge_feedback} 
includes
+information about attempted challenges, with the final state being 
@code{solved}:
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SELECTING",
+  "recovery_information": @{
+    "...": "..."
+  @}
+  "challenge_feedback": @{
+    "80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30" : @{
+      "state" : "solved"
+    @}
+  @}
+@}
+@end example
+
+Challenges feedback for a challenge can have many different @code{state} values
+that applications must all handle. States other than @code{solved} are:
+
+@quotation
+
+
+@itemize -
+
+@item 
+@strong{payment}: Here, the user must pay for a challenge. An example would be:
+
+@example
+@{
+  "backup_state": "CHALLENGE_PAYING",
+  "selected_challenge_uuid": 
"80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30",
+  "challenge_feedback": @{
+    "80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30" : @{
+     "state" : "payment",
+     "taler_pay_uri" : "taler://pay/...",
+     "provider" : "https://localhost:8080/";,
+     "payment_secret" : "3P4561HAMHRRYEYD6CM6J7TS5VTD5SR2K2EXJDZEFSX92XKHR4KG"
+    @}
+  @}
+@}
+@end example
+@end itemize
+
+@quotation
+
+
+@itemize -
+
+@item 
+@strong{body}: Here, the server provided an HTTP reply for
+how to solve the challenge, but the reducer could not parse
+them into a known format. A mime-type may be provided and may
+help parse the details.
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SOLVING",
+  "recovery_information": @{
+      "...": "..."
+  @}
+  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
+  "challenge_feedback": @{
+    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
+      "state": "body",
+      "body": "CROCKFORDBASE32ENCODEDBODY",
+      "http_status": 403,
+      "mime_type" : "anything/possible"
+    @}
+  @}
+@}
+@end example
+
+@item 
+@strong{hint}: Here, the server provided human-readable hint for
+how to solve the challenge.  Note that the @code{hint} provided this
+time is from the Anastasis provider and may differ from the @code{instructions}
+for the challenge under @code{recovery_information}:
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SOLVING",
+  "recovery_information": @{
+      "...": "..."
+  @}
+  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
+  "challenge_feedback": @{
+    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
+      "state": "hint",
+      "hint": "Recovery TAN send to email mail@@DOMAIN",
+      "http_status": 403
+    @}
+  @}
+@}
+@end example
+
+@item 
+@strong{details}: Here, the server provided a detailed JSON status response
+related to solving the challenge:
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SOLVING",
+  "recovery_information": @{
+      "...": "..."
+  @}
+  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
+  "challenge_feedback": @{
+    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
+      "state": "details",
+      "details": @{
+        "code": 8111,
+        "hint": "The client's response to the challenge was invalid.",
+        "detail" : null
+      @},
+      "http_status": 403
+    @}
+  @}
+@}
+@end example
+@end itemize
+
+@quotation
+
+
+@itemize -
+
+@item 
+@strong{redirect}: To solve the challenge, the user must visit the indicated
+Web site at @code{redirect_url}, for example to perform video authentication:
+@end itemize
+
+@quotation
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SOLVING",
+  "recovery_information": @{
+      "...": "..."
+  @}
+  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
+  "challenge_feedback": @{
+    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
+      "state": "redirect",
+      "redirect_url": "https://videoconf.example.com/";,
+      "http_status": 303
+    @}
+  @}
+@}
+@end example
+
+
+@itemize -
+
+@item 
+@strong{server-failure}: This indicates that the Anastasis provider encountered
+a failure and recovery using this challenge cannot proceed at this time.
+Examples for failures might be that the provider is unable to send SMS
+messages at this time due to an outage.  The body includes details about
+the failure. The user may try again later or continue with other challenges.
+@end itemize
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SELECTING",
+  "recovery_information": @{
+      "...": "..."
+  @}
+  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
+  "challenge_feedback": @{
+    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
+      "state": "server-failure",
+      "http_status": "500",
+      "error_code": 52
+    @}
+  @}
+@}
+@end example
+
+
+@itemize -
+
+@item 
+@strong{truth-unknown}: This indicates that the Anastasis provider is unaware 
of
+the specified challenge. This is typically a permanent failure, and user
+interfaces should not allow users to re-try this challenge.
+@end itemize
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SELECTING",
+  "recovery_information": @{
+      "...": "..."
+  @}
+  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
+  "challenge_feedback": @{
+    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
+      "state": "truth-unknown",
+      "error_code": 8108
+    @}
+  @}
+@}
+@end example
+
+
+@itemize -
+
+@item 
+@strong{rate-limit-exceeded}:
+@end itemize
+
+@example
+@{
+  "recovery_state": "CHALLENGE_SELECTING",
+  "recovery_information": @{
+      "...": "..."
+  @}
+  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
+  "challenge_feedback": @{
+    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
+      "state": "rate-limit-exceeded",
+      "error_code": 8121
+    @}
+  @}
+@}
+@end example
+@end quotation
+@end quotation
+@end quotation
+@end quotation
+
+@strong{pay:}
+
+With a @code{pay} transition, the application indicates to the reducer that
+a payment may have been made. Here, it is again possible to specify an
+optional @code{timeout} argument for long-polling, for example:
+
+@example
+@{
+    "payment_secret": "ABCDADF242525AABASD52525235ABABFDABABANALASDAAKASDAS"
+    "timeout" : @{ "d_ms" : 5000 @},
+@}
+@end example
+
+Depending on the type of the challenge and the result of the operation, the
+new state may be @code{CHALLENGE_SOLVING} (if say the SMS was now sent to the
+user), @code{CHALLENGE_SELECTING} (if the answer to the security question was
+correct), @code{RECOVERY_FINISHED} (if this was the last challenge that needed 
to
+be solved) or still @code{CHALLENGE_PAYING} (if the challenge was not actually
+paid for).  For sample messages, see the different types of
+@code{challenge_feedback} in the section about @code{select_challenge}.
+
+@strong{solve_challenge:}
+
+Solving a challenge takes various formats, depending on the type of the
+challenge and what is known about the answer.  The different supported
+formats are:
+
+@example
+@{
+    "answer": "answer to security question"
+@}
+@end example
+
+@example
+@{
+    "pin": 1234
+@}
+@end example
+
+@example
+@{
+    "hash": "SOMEBASE32ENCODEDHASHVALUE"
+@}
+@end example
+
+@c This file is part of Anastasis
+@c Copyright (C) 2019-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero General Public License as published by the Free 
Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
+@c @author Dominik Meister
+@c @author Dennis Neufeld
+
+@node Authentication Methods,DB Schema,Reducer API,Documentation Overview
+@anchor{authentication doc}@anchor{61}@anchor{authentication 
anastasis-auth-methods}@anchor{62}@anchor{authentication 
authentication-methods}@anchor{63}
+@section Authentication Methods
+
+
+This section describes the supported authentication methods in detail.  We
+note that the server implements rate limiting for all authentication methods
+to ensure that malicious strong attackers cannot guess the values by
+brute-force. Typically, a user is given three attempts per hour to enter the
+correct code from 2^63 possible values.  Transmitted codes also come with an
+expiration date. If the user re-requests a challenge to be sent, the same
+challenge may be transmitted (with the three attempts counter not increasing!)
+for a limited period of time (depending on the authentication method) before
+the service eventually rotates to a fresh random code with a fresh retry
+counter. Given the default value range and time intervals (which providers are
+at liberty to adjust), brute-force attacks against this are expected to
+succeed with a 50% probability after about 200000 years of attempts at the
+maximum permissible frequency.
+
+@menu
+* SMS (sms): SMS sms. 
+* Email verification (email): Email verification email. 
+* Video identification (vid): Video identification vid. 
+* Security question (qa): Security question qa. 
+* Snail mail verification (post): Snail mail verification post. 
+
+@end menu
+
+@node SMS sms,Email verification email,,Authentication Methods
+@anchor{authentication sms-sms}@anchor{64}
+@subsection SMS (sms)
+
+
+Sends an SMS with a code (prefixed with @code{A-}) to the user’s phone, 
including
+a UUID which identifies the challenge the code is for.  The user must send
+this code back with his request (see @code{$RESPONSE} under @ref{4f,,Managing 
truth}).
+If the transmitted code is correct, the server responses with the requested
+encrypted key share.
+
+@node Email verification email,Video identification vid,SMS sms,Authentication 
Methods
+@anchor{authentication email-verification-email}@anchor{65}
+@subsection Email verification (email)
+
+
+Sends an email with a code (prefixed with @code{A-}) to the user’s mail 
address,
+including a UUID which identifies the challenge the code is for.  The user
+must send this code back with his request (see @code{$RESPONSE} under 
@ref{4f,,Managing truth}).
+If the transmitted code is correct, the server responses with the
+requested encrypted key share.
+
+@node Video identification vid,Security question qa,Email verification 
email,Authentication Methods
+@anchor{authentication video-identification-vid}@anchor{66}
+@subsection Video identification (vid)
+
+
+Requires the user to identify via video-call.  In the video-call, the
+user is told the code (prefixed with @code{A-}) needed to authenticate.
+
+The user is expected to delete all metadata revealing personal information
+from the images before uploading them. Since the respective images must be
+passed on to the video identification service in the event of password
+recovery, it should be ensured that no further information about the user can
+be derived from them.
+
+Video identification will typically result in the Anastasis provider
+requesting the user to be redirected to a Web site (or other URL) for the
+video-call.
+
+@node Security question qa,Snail mail verification post,Video identification 
vid,Authentication Methods
+@anchor{authentication security-question-qa}@anchor{67}
+@subsection Security question (qa)
+
+
+Asks the user a security question.  The user sends back a @strong{salted}
+hash over the answer.  The @strong{question-salt} is stored encrypted as
+part of the recovery document and never revealed to the providers. This
+ensures that providers cannot derive the answer from the hash value.
+Furthermore, the security question itself is also only in the recovery
+document and never given to the Anastasis provider.  A moderately expensive
+hash function is used to further limit strong attackers that have obtained
+the recovery document from brute-forcing the answer.
+
+If the hash value matches with the one the server is expecting, the server
+answers with the requested encrypted key share.  However, unlike other
+encrypted key shares, the encrypted key share of a security question uses a
+special variation of the Anastasis encryption: Here, a different hash function
+over the security answer is used to provide an additional @strong{key-salt} 
for the
+decryption of the (encrypted) @strong{key share}.  This ensures that the key 
share
+remains irrecoverable without the answer even if the Anastasis provider
+storing the security question is malicious.
+
+@node Snail mail verification post,,Security question qa,Authentication Methods
+@anchor{authentication snail-mail-verification-post}@anchor{68}
+@subsection Snail mail verification (post)
+
+
+Sends physical mail (snail mail) with a code (prefixed with @code{A-}) to the
+user’s mail address, including a UUID which identifies the challenge the code
+is for.  The user must send this code back with their request (see
+@code{$RESPONSE} under @ref{4f,,Managing truth}).  If the transmitted code is 
correct,
+the server responds with the requested encrypted key share.
+
+@c This file is part of Anastasis
+@c Copyright (C) 2019-2021 Anastasis SARL
+@c 
+@c Anastasis is free software; you can redistribute it and/or modify it under 
the
+@c terms of the GNU Affero General Public License as published by the Free 
Software
+@c Foundation; either version 2.1, or (at your option) any later version.
+@c 
+@c Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+@c WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR
+@c A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more 
details.
+@c 
+@c You should have received a copy of the GNU Affero General Public License 
along with
+@c Anastasis; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+@c 
+@c @author Christian Grothoff
+@c @author Dominik Meister
+@c @author Dennis Neufeld
+
+@node DB Schema,Design Documents,Authentication Methods,Documentation Overview
+@anchor{db doc}@anchor{69}@anchor{db db-schema}@anchor{6a}
+@section DB Schema
+
+
+@image{anastasis-figures/anastasis-db,,,,png}
+
+@image{anastasis-figures/anastasis_challengecode,,,,png}
+
+@image{anastasis-figures/anastasis_challenge_payment,,,,png}
+
+@image{anastasis-figures/anastasis_truth,,,,png}
+
+@image{anastasis-figures/anastasis_truth_payment,,,,png}
+
+@node Design Documents,Anastasis licensing information,DB Schema,Documentation 
Overview
+@anchor{design-documents/index doc}@anchor{6b}@anchor{design-documents/index 
design-documents}@anchor{6c}
+@section Design Documents
+
+
+This is a collection of design documents related to Anastasis.
+The goal of these documents is to discuss facilitate discussion around
+new features while keeping track of the evolution of the whole system
+and protocol.
+
+@menu
+* Design Doc 001; Anastasis User Experience: Design Doc 001 Anastasis User 
Experience. 
+* Template:: 
+
+@end menu
+
+@node Design Doc 001 Anastasis User Experience,Template,,Design Documents
+@anchor{design-documents/001-anastasis-ux 
doc}@anchor{6d}@anchor{design-documents/001-anastasis-ux 
design-doc-001-anastasis-user-experience}@anchor{6e}
+@subsection Design Doc 001: Anastasis User Experience
+
+
+@menu
+* Summary:: 
+* Motivation:: 
+* Setup Steps:: 
+* Show Service Status After Setup:: 
+* Recovery Steps:: 
+
+@end menu
+
+@node Summary,Motivation,,Design Doc 001 Anastasis User Experience
+@anchor{design-documents/001-anastasis-ux summary}@anchor{6f}
+@subsubsection Summary
+
+
+This document describes the recommended way of implementing the user experience
+of setting up and making use of @ref{3,,Introduction} account recovery.
+
+@node Motivation,Setup Steps,Summary,Design Doc 001 Anastasis User Experience
+@anchor{design-documents/001-anastasis-ux motivation}@anchor{70}
+@subsubsection Motivation
+
+
+Wallet state consisting of digital cash, transaction history etc. should not 
be lost.
+Taler provides a backup mechanism to prevent that.
+As an additional protection measure Anastasis can be used to provide access to 
the backup,
+even if all devices and offline secrets have been lost.
+
+Access to the backup key is shared with escrow providers that can be chosen by 
the user.
+
+@node Setup Steps,Show Service Status After Setup,Motivation,Design Doc 001 
Anastasis User Experience
+@anchor{design-documents/001-anastasis-ux setup-steps}@anchor{71}
+@subsubsection Setup Steps
+
+@image{graphviz-2d8d83202d2b7835498d2a5c18fa9e3cc05c4b6a,,,[graphviz],png}
+
+@menu
+* Entry point; Settings: Entry point Settings. 
+* Providing Identification:: 
+* Add Authentication Methods:: 
+* Confirm/Change Service Providers:: 
+* Defining Recovery Options:: 
+* Pay for Setup:: 
+
+@end menu
+
+@node Entry point Settings,Providing Identification,,Setup Steps
+@anchor{design-documents/001-anastasis-ux entry-point-settings}@anchor{72}
+@subsubsection Entry point: Settings
+
+
+The app settings should have a section for Anastasis using a different more
+universally understood name like Wallet Recovery.
+
+The section should have an option to setup Anastasis initially.  This option
+should be disabled as long as no backup has been set up.  The section could
+maybe be integrated into the backup settings.
+
+@image{anastasis-figures/menu,,,,png}
+
+@image{anastasis-figures/settings,,,,png}
+
+@image{anastasis-figures/backupsettings,,,,png}
+
+@node Providing Identification,Add Authentication Methods,Entry point 
Settings,Setup Steps
+@anchor{design-documents/001-anastasis-ux providing-identification}@anchor{73}
+@subsubsection Providing Identification
+
+
+Instead of a forgettable freely chosen user name, Anastasis collects various
+static information from the user to generate a unique user identifier from
+that.  Examples for such identifier would be a concatenation of the full name
+of the user and their social security or passport number(s).
+
+The information that can reasonably used here various from cultural context
+and jurisdiction.  Therefore, one idea is to start by asking for continent and
+then the country of primary legal residence, and then continue from there with
+country-specific attributes (and also offer a stateless person option).
+
+Special care should be taken to avoid that information can later be provided
+ambiguously thus changing the user identifier and not being able to restore
+the user’s data.  This can be typographic issues like someone providing
+“Seestr.”  and later “Seestrasse” or “Seestraße” or “seestrasse”.  But it can
+also be simple typos that we can only prevent in some instances like when
+checking checksums in passport numbers.
+
+The user should be made aware that this data will not leave the app and that
+it is only used to compute a unique identifier that can not be forgotten.
+
+If possible, we should guide the user in the country selection by accessing
+permission-less information such as the currently set language/locale and the
+country of the SIM card.  But nothing invasive like the actual GPS location.
+
+@image{anastasis-figures/userid,,,,png}
+
+@node Add Authentication Methods,Confirm/Change Service Providers,Providing 
Identification,Setup Steps
+@anchor{design-documents/001-anastasis-ux 
add-authentication-methods}@anchor{74}
+@subsubsection Add Authentication Methods
+
+
+After creating a unique identifier, the user can chose one or more
+@ref{62,,Authentication Methods} supported by Anastasis.
+
+When selecting a method, the user is already asked to provide the information
+required for the recovery with that method.  For example, a photo of
+themselves, their phone number or mailing address.
+
+The user interface validates that the inputs are well-formed, and refuses
+inputs that are clearly invalid. Where possible, it pre-fills the fields with
+sane values (phone number, e-mail addresses, country of residence).
+
+@image{anastasis-figures/truth,,,,png}
+
+@image{anastasis-figures/addtruth,,,,png}
+
+@image{anastasis-figures/addtruthmail,,,,png}
+
+@node Confirm/Change Service Providers,Defining Recovery Options,Add 
Authentication Methods,Setup Steps
+@anchor{design-documents/001-anastasis-ux 
confirm-change-service-providers}@anchor{75}
+@subsubsection Confirm/Change Service Providers
+
+
+From the dialog where the user is adding authentication methods, the user can
+optionally jump to a side-action with list of available providers (and their
+status) and possibly add additional providers that are not included in the
+default list provided by the wallet.
+
+@image{anastasis-figures/policy,,,,png}
+
+@image{anastasis-figures/addpolicy,,,,png}
+
+@image{anastasis-figures/addpolicymethod,,,,png}
+
+@node Defining Recovery Options,Pay for Setup,Confirm/Change Service 
Providers,Setup Steps
+@anchor{design-documents/001-anastasis-ux defining-recovery-options}@anchor{76}
+@subsubsection Defining Recovery Options
+
+
+After mapping authentication methods to providers, the user needs select which
+combinations are sufficient to recover the secret.  Here, the system
+pre-computes a reasonably sane allocation, for small @code{n} the default could
+be @code{n-1} out of @code{n}.
+
+We should propose a mapping of authentication methods to providers by
+minimizing cost (tricky: sign-up vs. recovery costs, different currencies) and
+distributing the selected authentication methods across as many providers as
+possible.
+
+The user should be able to change the proposed default selection
+and add more than one provider to each chosen method.
+
+Using Anastatis providers usually is not free.  From here on, the UI should
+show estimated recurring costs (yearly) and the cost of recovery.  These costs
+should get updated with each user action affecting those costs such as
+when the user reconfigures the policies.
+
+@node Pay for Setup,,Defining Recovery Options,Setup Steps
+@anchor{design-documents/001-anastasis-ux pay-for-setup}@anchor{77}
+@subsubsection Pay for Setup
+
+
+As the last step when all information has been properly provided, the user is
+asked to pay for the service with the regular wallet payment confirmation
+screen.
+
+@node Show Service Status After Setup,Recovery Steps,Setup Steps,Design Doc 
001 Anastasis User Experience
+@anchor{design-documents/001-anastasis-ux 
show-service-status-after-setup}@anchor{78}
+@subsubsection Show Service Status After Setup
+
+
+TODO
+
+@node Recovery Steps,,Show Service Status After Setup,Design Doc 001 Anastasis 
User Experience
+@anchor{design-documents/001-anastasis-ux recovery-steps}@anchor{79}
+@subsubsection Recovery Steps
+
+@image{graphviz-834e5a93329dec2ccdefd2a21bdfb5a02bad1c84,,,[graphviz],png}
+
+@menu
+* Entry point; Settings: Entry point Settings<2>. 
+* Providing Identification: Providing Identification<2>. 
+* Select Authentication Challenge:: 
+* Payment:: 
+* Enter Challenge Response:: 
+* Success:: 
+
+@end menu
+
+@node Entry point Settings<2>,Providing Identification<2>,,Recovery Steps
+@anchor{design-documents/001-anastasis-ux id1}@anchor{7a}
+@subsubsection Entry point: Settings
+
+
+Like the backup, the recovery option should be available via
+the App settings.
+
+The section should have an option to recover from backup.  If a previous
+recovery was not completed, the interaction should resume from that previous
+checkpoint instead of from the beginning.
+
+@image{anastasis-figures/menu,,,,png}
+
+@image{anastasis-figures/settings,,,,png}
+
+@image{anastasis-figures/backupsettings,,,,png}
+
+@node Providing Identification<2>,Select Authentication Challenge,Entry point 
Settings<2>,Recovery Steps
+@anchor{design-documents/001-anastasis-ux id2}@anchor{7b}
+@subsubsection Providing Identification
+
+
+The first dialog(s) during recovery should be identical to the first dialog
+during backup: the user is asked to select a continent, country of residence
+and then to provide country-specific inputs for identification.
+
+@image{anastasis-figures/userid,,,,png}
+
+@node Select Authentication Challenge,Payment,Providing 
Identification<2>,Recovery Steps
+@anchor{design-documents/001-anastasis-ux 
select-authentication-challenge}@anchor{7c}
+@subsubsection Select Authentication Challenge
+
+
+If Anastasis could recover the recovery document via any provider, it should
+show a dialog allowing the user to select one of the open challenges, and
+highlight which challenges still need to be satisfied for the various policies.
+
+Additionally, the specific provider and recovery document version should be 
shown.
+The user should be able to change the provider or recovery document version,
+resulting in a switch of the recovery document and policies. If the user has
+already satisfied some challenges of the current recovery document, switching 
to a
+different recovery document should only be done after a confirmation pop-up 
dialog
+warning the user that the existing progress will be lost.
+
+When selecting a challenge, the user may be asked to confirm making a payment
+for this challenge if the provider requires payment.
+
+@node Payment,Enter Challenge Response,Select Authentication 
Challenge,Recovery Steps
+@anchor{design-documents/001-anastasis-ux payment}@anchor{7d}
+@subsubsection Payment
+
+
+Typcially, this would be the canonical wallet payment confirmation dialog.
+
+However, in the case of a security question, the payment confirmation should
+be combined with the dialog where the user enters the security answer (so
+instead of an @code{Ok} button, text showing the amount due and @code{Pay} 
should be
+used – except of course if the security question challenge is free of
+charge).
+
+@node Enter Challenge Response,Success,Payment,Recovery Steps
+@anchor{design-documents/001-anastasis-ux enter-challenge-response}@anchor{7e}
+@subsubsection Enter Challenge Response
+
+
+If the challenge was not a security question, the dialog to enter the security
+code (PIN/TAN) should open after payment.  The security code field should have
+a prefix @code{A-}. However, the user should be able to enter both only the
+numeric code, or the full code with the @code{A-} prefix (or ideally, the user
+cannot delete the pre-filled @code{A-} text).
+
+@node Success,,Enter Challenge Response,Recovery Steps
+@anchor{design-documents/001-anastasis-ux success}@anchor{7f}
+@subsubsection Success
+
+
+The user is informed about the successful recovery.  We may want to do this
+as part of a separate screen, or simply with a notification bar in the
+main wallet screen.
+
+@node Template,,Design Doc 001 Anastasis User Experience,Design Documents
+@anchor{design-documents/999-template 
doc}@anchor{80}@anchor{design-documents/999-template template}@anchor{81}
+@subsection Template
+
+
+@menu
+* Summary: Summary<2>. 
+* Motivation: Motivation<2>. 
+* Requirements:: 
+* Proposed Solution:: 
+* Alternatives:: 
+* Drawbacks:: 
+* Discussion / Q&A:: 
+
+@end menu
+
+@node Summary<2>,Motivation<2>,,Template
+@anchor{design-documents/999-template summary}@anchor{82}
+@subsubsection Summary
+
+
+@node Motivation<2>,Requirements,Summary<2>,Template
+@anchor{design-documents/999-template motivation}@anchor{83}
+@subsubsection Motivation
+
+
+@node Requirements,Proposed Solution,Motivation<2>,Template
+@anchor{design-documents/999-template requirements}@anchor{84}
+@subsubsection Requirements
+
+
+@node Proposed Solution,Alternatives,Requirements,Template
+@anchor{design-documents/999-template proposed-solution}@anchor{85}
+@subsubsection Proposed Solution
+
+
+@node Alternatives,Drawbacks,Proposed Solution,Template
+@anchor{design-documents/999-template alternatives}@anchor{86}
+@subsubsection Alternatives
+
+
+@node Drawbacks,Discussion / Q&A,Alternatives,Template
+@anchor{design-documents/999-template drawbacks}@anchor{87}
+@subsubsection Drawbacks
+
+
+@node Discussion / Q&A,,Drawbacks,Template
+@anchor{design-documents/999-template discussion-q-a}@anchor{88}
+@subsubsection Discussion / Q&A
+
+
+(This should be filled in with results from discussions on mailing lists / 
personal communication.)
+
+@node Anastasis licensing information,Man Pages,Design Documents,Documentation 
Overview
+@anchor{global-licensing doc}@anchor{89}@anchor{global-licensing 
anastasis-licensing-information}@anchor{8a}
+@section Anastasis licensing information
+
+
+This file gives an overview of all Anastasis component’s licensing and
+of runtime dependencies thereof. For “component” here is meant a set
+of source files which can be retrieved from a single repository.  If
+components consist of sources under different licensing regimes, i.e.
+because we want to enable third party developments to easily integrate
+with Taler, those are described as well.
+
+All Anastasis components are generally released under the Affero
+GPL.
+
+@menu
+* Anastasis (git;//git.taler.net/anastasis): Anastasis git //git taler 
net/anastasis. 
+* Anastasis-gtk (git;//git.taler.net/anastasis-gtk): Anastasis-gtk git //git 
taler net/anastasis-gtk. 
+* Documentation:: 
+
+@end menu
+
+@node Anastasis git //git taler net/anastasis,Anastasis-gtk git //git taler 
net/anastasis-gtk,,Anastasis licensing information
+@anchor{global-licensing 
anastasis-git-git-taler-net-anastasis}@anchor{8b}@anchor{global-licensing 
exchange-repo}@anchor{8c}
+@subsection Anastasis (git://git.taler.net/anastasis)
+
+
+Anastasis core logic is under AGPL.
+
+@menu
+* Runtime dependencies:: 
+
+@end menu
+
+@node Runtime dependencies,,,Anastasis git //git taler net/anastasis
+@anchor{global-licensing runtime-dependencies}@anchor{8d}
+@subsubsection Runtime dependencies
+
+
+The following list encompasses all the runtime dependencies for this
+project, and gives the copyright holder for each of them:
+
+
+@itemize *
+
+@item 
+libjansson: MIT License, AGPL- and LGPL-Compatible, owned by Petri Lehtinen 
and other individuals
+
+@item 
+libgcrypt: LGPL, owned by Free Software Foundation
+
+@item 
+postgresql: PostgreSQL License, AGPL- and LGPL-Compatible, owned by The 
PostgreSQL Global Development Group
+
+@item 
+libgnunetutil (in all of its variants): GPLv3+, owned by GNUnet e.V.
+
+@item 
+libgnunetjson: GPLv3+, GNUnet e.V.
+
+@item 
+GNU Taler: LGPLv3+ / GPLv3+ / AGPLv3+: owned by Taler Systems SA
+@end itemize
+
+@node Anastasis-gtk git //git taler net/anastasis-gtk,Documentation,Anastasis 
git //git taler net/anastasis,Anastasis licensing information
+@anchor{global-licensing 
anastasis-gtk-git-git-taler-net-anastasis-gtk}@anchor{8e}
+@subsection Anastasis-gtk (git://git.taler.net/anastasis-gtk)
+
+
+Anastasis-gtk is under AGPL.
+
+@menu
+* Runtime dependencies: Runtime dependencies<2>. 
+
+@end menu
+
+@node Runtime dependencies<2>,,,Anastasis-gtk git //git taler net/anastasis-gtk
+@anchor{global-licensing id1}@anchor{8f}
+@subsubsection Runtime dependencies
+
+
+The following list encompasses all the runtime dependencies for this
+project, and gives the copyright holder for each of them:
+
+
+@itemize *
+
+@item 
+libjansson: MIT License, AGPL- and LGPL-Compatible, owned by Petri Lehtinen 
and other individuals
+
+@item 
+libgcrypt: LGPL, owned by Free Software Foundation
+
+@item 
+postgresql: PostgreSQL License, AGPL- and LGPL-Compatible, owned by The 
PostgreSQL Global Development Group
+
+@item 
+libgnunetutil (in all of its variants): GPLv3+, owned by GNUnet e.V.
+
+@item 
+libgnunetjson: GPLv3+, GNUnet e.V.
+
+@item 
+libgnunetgtk: GPLv3+, GNUnet e.V.
+
+@item 
+GNU Taler: LGPLv3+ / GPLv3+ / AGPLv3+: owned by Taler Systems SA
+@end itemize
+
+@node Documentation,,Anastasis-gtk git //git taler net/anastasis-gtk,Anastasis 
licensing information
+@anchor{global-licensing documentation}@anchor{90}
+@subsection Documentation
+
+
+The documentation is licensed under the GNU Free Documentation License Version 
1.3 or later.
+
+@node Man Pages,Complete Index,Anastasis licensing information,Documentation 
Overview
+@anchor{manindex doc}@anchor{91}@anchor{manindex man-pages}@anchor{92}
+@section Man Pages
+
+
+@menu
+* anastasis-config(1): anastasis-config 1. 
+* anastasis-gtk(1): anastasis-gtk 1. 
+* anastasis-httpd(1): anastasis-httpd 1. 
+* anastasis-reducer(1): anastasis-reducer 1. 
+* anastasis.conf(5): anastasis conf 5. 
+
+@end menu
+
+@node anastasis-config 1,anastasis-gtk 1,,Man Pages
+@anchor{manpages/anastasis-config 1 
doc}@anchor{93}@anchor{manpages/anastasis-config 1 
anastasis-config-1}@anchor{94}
+@subsection anastasis-config(1)
+
+
+
+@menu
+* Synopsis:: 
+* Description:: 
+* See Also:: 
+* Bugs:: 
+
+@end menu
+
+@node Synopsis,Description,,anastasis-config 1
+@anchor{manpages/anastasis-config 1 synopsis}@anchor{95}
+@subsubsection Synopsis
+
+
+@strong{anastasis-config}
+[@strong{-b} @emph{backend} | @strong{––supported-backend=}@emph{backend}]
+[@strong{-c} @emph{filename} | @strong{––config=}@emph{filename}]
+[@strong{-f} | @strong{––filename}]
+[@strong{-F} | @strong{––full}]
+[@strong{-h} | @strong{––help}]
+[@strong{-L} @emph{loglevel} | @strong{––loglevel=}@emph{loglevel}]
+[@strong{-l} @emph{filename} | @strong{––logfile=}‌@emph{filename}]
+[@strong{-o} @emph{option} | @strong{––option=}@emph{option}]
+[@strong{-r} | @strong{––rewrite}]
+[@strong{-S} | @strong{––list-sections}]
+[@strong{-s} @emph{section} | @strong{––section=}@emph{section}]
+[@strong{-V} @emph{value} | @strong{––value=}@emph{value}]
+[@strong{-v} | @strong{––version}]
+
+@node Description,See Also,Synopsis,anastasis-config 1
+@anchor{manpages/anastasis-config 1 description}@anchor{96}
+@subsubsection Description
+
+
+@strong{anastasis-config} can be used to read or modify Anastasis 
configuration files.
+
+
+@table @asis
+
+@item @strong{-b} @emph{BACKEND} | @strong{––supported-backend=}@emph{BACKEND}
+
+Tests whether the specified @emph{BACKEND} is supported by the current 
installation.
+The backend must match the name of a plugin, i.e. “namestore_postgres” for
+the Postgres database backend of the “NAMESTORE” service.  If @emph{BACKEND} is
+supported, anastasis-config will return a status code of 0 (success), otherwise
+77 (unsupported).  When this option is specified, no other options may be
+specified. Specifying this option together with other options will cause
+anastasis-config to return a status code of 1 (error).
+
+@item @strong{-c} @emph{FILENAME} | @strong{––config=}@emph{FILENAME}
+
+Use the configuration file @emph{FILENAME}.
+
+@item @strong{-f} | @strong{––filename}
+
+Try to perform expansions as if the option values represent filenames (will
+also be applied even if the option is not really a filename).
+
+@item @strong{-F} | @strong{––full}
+
+Write the full configuration file, not just the differences to the defaults.
+
+@item @strong{-h} | @strong{––help}
+
+Print short help on options.
+
+@item @strong{-L} @emph{LOGLEVEL} | @strong{––loglevel=}@emph{LOGLEVEL}
+
+Use @emph{LOGLEVEL} for logging.
+Valid values are @code{DEBUG}, @code{INFO}, @code{WARNING}, and @code{ERROR}.
+
+@item @strong{-l} @emph{FILENAME} | @strong{––logfile=}‌@emph{FILENAME}
+
+Send logging output to @emph{FILENAME}.
+
+@item @strong{-o} @emph{OPTION} | @strong{––option=}@emph{OPTION}
+
+Which configuration option should be accessed or edited.  Required to set a
+value.  If not given, all values of a given section will be printed in the
+format “OPTION = VALUE”.
+
+@item @strong{-r} | @strong{––rewrite}
+
+Write the configuration file even if nothing changed. Will remove all comments!
+
+@item @strong{-S} | @strong{––list-sections}
+
+List available configuration sections for use with @code{--section}.
+
+@item @strong{-s} @emph{SECTION} | @strong{––section=}@emph{SECTION}
+
+Which configuration section should be accessed or edited.
+Required option.
+
+@item @strong{-V} @emph{VALUE} | @strong{––value=}@emph{VALUE}
+
+Configuration value to store in the given section under the given option.
+Must only be given together with @code{-s} and @code{-o} options.
+
+
+@table @asis
+
+@item Note:
+
+Changing the configuration file with @code{-V} will remove comments
+and may reorder sections and remove @code{@@INLINE@@} directives.
+@end table
+
+@item @strong{-v} | @strong{––version}
+
+Print Anastasis version number.
+@end table
+
+@node See Also,Bugs,Description,anastasis-config 1
+@anchor{manpages/anastasis-config 1 see-also}@anchor{97}
+@subsubsection See Also
+
+
+anastasis.conf(5)
+
+@node Bugs,,See Also,anastasis-config 1
+@anchor{manpages/anastasis-config 1 bugs}@anchor{98}
+@subsubsection Bugs
+
+
+Report bugs by using @indicateurl{https://bugs.anastasis.lu} or by sending 
electronic
+mail to <@email{contact@@anastasis.lu}>.
+
+@node anastasis-gtk 1,anastasis-httpd 1,anastasis-config 1,Man Pages
+@anchor{manpages/anastasis-gtk 1 doc}@anchor{99}@anchor{manpages/anastasis-gtk 
1 anastasis-gtk-1}@anchor{9a}
+@subsection anastasis-gtk(1)
+
+
+
+@menu
+* Synopsis: Synopsis<2>. 
+* Description: Description<2>. 
+* See Also: See Also<2>. 
+* Bugs: Bugs<2>. 
 
-@strong{delete_authentication}:
+@end menu
 
-This transition can be used to remove an authentication method from the
-array of authentication methods. It simply requires the index of the
-authentication method to remove. Note that the array is 0-indexed:
+@node Synopsis<2>,Description<2>,,anastasis-gtk 1
+@anchor{manpages/anastasis-gtk 1 synopsis}@anchor{9b}
+@subsubsection Synopsis
 
-@example
-@{
-  "authentication_method": 1
-@}
-@end example
 
-Assuming we begin with the state from the example above, this would
-remove the @code{email} authentication method, resulting in the following
-response:
+@strong{anastasis-gtk}
+[@strong{-c} @emph{FILENAME} | @strong{––config=}‌@emph{FILENAME}]
+[@strong{-h} | @strong{––help}]
+[@strong{-L} @emph{LOGLEVEL} | @strong{––loglevel=}‌@emph{LOGLEVEL}]
+[@strong{-l} @emph{FILENAME} | @strong{––logfile=}‌@emph{FILENAME}]
+[@strong{-v} | @strong{––version}]
 
-@example
-@{
-  "backup_state": "AUTHENTICATIONS_EDITING",
-  "authentication_methods": [
-    @{
-      "type": "question",
-      "mime_type" : "text/plain",
-      "instructions" : "What is your favorite GNU package?",
-      "challenge" : "gdb",
-    @}
-  ]
-@}
-@end example
+@node Description<2>,See Also<2>,Synopsis<2>,anastasis-gtk 1
+@anchor{manpages/anastasis-gtk 1 description}@anchor{9c}
+@subsubsection Description
 
-If the index is invalid, the reducer will instead
-transition into an ERROR state.
 
-@strong{next} (from “AUTHENTICATIONS_EDITING”):
+@strong{anastasis-gtk} is a graphical tool to run Anastasis
+key recover and backup operations.
 
-This transition confirms that the user has finished adding (or removing)
-authentication methods, and that the system should now automatically compute
-a set of reasonable recovery policies.
 
-This transition does not take any mandatory arguments.  Optional arguments can
-be provided to upload the recovery document only to a specific subset of the
-providers:
+@table @asis
 
-@example
-@{
-  "provider_id": [
-    "http://localhost:8088/";,
-    "http://localhost:8089/";
-  ]
-@}
-@end example
+@item @strong{-c} @emph{FILENAME} | @strong{––config=}‌@emph{FILENAME}
 
-..note:
+Use the configuration from @emph{FILENAME}.
 
-@example
-This is currently not supported (#6760), the current implementation of the
-reducer ignores this optional argument.
-@end example
+@item @strong{-h} | @strong{––help}
 
-The resulting state provides the suggested recovery policies in a way suitable
-for presentation to the user:
+Print short help on options.
 
-@example
-@{
-  "backup_state": "POLICIES_REVIEWING",
-  "policies": [
-    @{
-      "methods": [
-        @{
-          "authentication_method": 0,
-          "provider": "http://localhost:8088/";
-        @},
-        @{
-          "authentication_method": 1,
-          "provider": "http://localhost:8089/";
-        @},
-        @{
-          "authentication_method": 2,
-          "provider": "http://localhost:8087/";
-        @}
-      ]
-    @},
-    @{
-      "methods": [
-        @{
-          "authentication_method": 0,
-          "provider": "http://localhost:8088/";
-        @},
-        @{
-          "authentication_method": 1,
-          "provider": "http://localhost:8089/";
-        @},
-        @{
-          "authentication_method": 3,
-          "provider": "http://localhost:8089/";
-        @}
-      ]
-    @}
-  ]
-@}
-@end example
+@item @strong{-L} @emph{LOGLEVEL} | @strong{––loglevel=}‌@emph{LOGLEVEL}
 
-For each recovery policy, the state includes the specific details of which
-authentication @code{methods} must be solved to recovery the secret using this
-policy.  The @code{methods} array specifies the index of the
-@code{authentication_method} in the @code{authentication_methods} array, as 
well as
-the provider that was selected to supervise this authentication.
+Specifies the log level to use. Accepted values are: @code{DEBUG}, @code{INFO},
+@code{WARNING}, @code{ERROR}.
 
-If no authentication method was provided, the reducer will transition into an
-ERROR state instead of suggesting policies.
+@item @strong{-l} @emph{FILENAME} | @strong{––logfile=}‌@emph{FILENAME}
 
-@strong{add_policy}:
+Send logging output to @emph{FILENAME}.
 
-Using this transition, the user can add an additional recovery policy to the
-state.  The argument format is the same that is used in the existing state.
-An example for a possible argument would thus be:
+@item @strong{-v} | @strong{––version}
 
-@example
-@{
-  "policy": [
-    @{
-      "authentication_method": 1,
-      "provider": "http://localhost:8088/";
-    @},
-    @{
-      "authentication_method": 3,
-      "provider": "http://localhost:8089/";
-    @}
-  ]
-@}
-@end example
+Print version information.
+@end table
 
-Note that the specified providers must already be in the
-@code{authentication_providers} of the state. You cannot add new providers at
-this stage.  The reducer will simply attempt to append the suggested policy to
-the “policies” array, returning an updated state:
+@node See Also<2>,Bugs<2>,Description<2>,anastasis-gtk 1
+@anchor{manpages/anastasis-gtk 1 see-also}@anchor{9d}
+@subsubsection See Also
 
-@example
-@{
-  "backup_state": "POLICIES_REVIEWING",
-  "policies": [
-    @{
-      "methods": [
-        @{
-          "authentication_method": 0,
-          "provider": "http://localhost:8089/";
-        @},
-        @{
-          "authentication_method": 1,
-          "provider": "http://localhost:8088/";
-        @}
-      ]
-    @},
-    @{
-      "methods": [
-        @{
-          "authentication_method": 0,
-          "provider": "http://localhost:8089/";
-        @},
-        @{
-          "authentication_method": 2,
-          "provider": "http://localhost:8088/";
-        @}
-      ]
-    @},
-    @{
-      "methods": [
-        @{
-          "authentication_method": 1,
-          "provider": "http://localhost:8089/";
-        @},
-        @{
-          "authentication_method": 2,
-          "provider": "http://localhost:8088/";
-        @}
-      ]
-    @},
-    @{
-      "methods": [
-        @{
-          "authentication_method": 1,
-          "provider": "http://localhost:8088/";
-        @},
-        @{
-          "authentication_method": 3,
-          "provider": "http://localhost:8089/";
-        @}
-      ]
-    @}
-  ]
-@}
-@end example
 
-If the new policy is invalid, for example because it add an unknown
-authentication method or the selected provider does not support the type of
-authentication, the reducer will transition into an ERROR state instead of
-adding the new policy.
+anastasis-reducer(1), anastasis-httpd(1), anastasis.conf(5).
 
-@strong{delete_policy:}
+@node Bugs<2>,,See Also<2>,anastasis-gtk 1
+@anchor{manpages/anastasis-gtk 1 bugs}@anchor{9e}
+@subsubsection Bugs
 
-This transition allows the deletion of a recovery policy. The argument
-simply specifies the index of the policy to delete, for example:
 
-@example
-@{
-  "policy_index": 3
-@}
-@end example
+Report bugs by using @indicateurl{https://bugs.anastasis.lu/} or by sending 
electronic
+mail to <@email{contact@@anastasis.lu}>.
 
-Given as input the state from the example above, the expected new state would
-be:
+@node anastasis-httpd 1,anastasis-reducer 1,anastasis-gtk 1,Man Pages
+@anchor{manpages/anastasis-httpd 1 
doc}@anchor{9f}@anchor{manpages/anastasis-httpd 1 anastasis-httpd-1}@anchor{a0}
+@subsection anastasis-httpd(1)
 
-@example
-@{
-  "backup_state": "POLICIES_REVIEWING",
-  "policies": [
-    @{
-      "methods": [
-        @{
-          "authentication_method": 0,
-          "provider": "http://localhost:8089/";
-        @},
-        @{
-          "authentication_method": 1,
-          "provider": "http://localhost:8088/";
-        @}
-      ]
-    @},
-    @{
-      "methods": [
-        @{
-          "authentication_method": 0,
-          "provider": "http://localhost:8089/";
-        @},
-        @{
-          "authentication_method": 2,
-          "provider": "http://localhost:8088/";
-        @}
-      ]
-    @},
-    @{
-      "methods": [
-        @{
-          "authentication_method": 1,
-          "provider": "http://localhost:8089/";
-        @},
-        @{
-          "authentication_method": 2,
-          "provider": "http://localhost:8088/";
-        @}
-      ]
-    @}
-  ]
-@}
-@end example
 
-If the index given is invalid, the reducer will transition into an ERROR state
-instead of deleting a policy.
 
-@strong{next} (from “POLICIES_REVIEWING”):
+@menu
+* Synopsis: Synopsis<3>. 
+* Description: Description<3>. 
+* Signals:: 
+* See also:: 
+* Bugs: Bugs<3>. 
+
+@end menu
 
-Using this transition, the user confirms that the policies in the current
-state are acceptable. The transition does not take any arguments.
+@node Synopsis<3>,Description<3>,,anastasis-httpd 1
+@anchor{manpages/anastasis-httpd 1 synopsis}@anchor{a1}
+@subsubsection Synopsis
 
-The reducer will simply transition to the @code{SECRET_EDITING} state:
 
-@example
-@{
-  "backup_state": "SECRET_EDITING",
-@}
-@end example
+@strong{anastasis-httpd}
 
-If the array of @code{policies} is currently empty, the reducer will transition
-into an ERROR state instead of allowing the user to continue.
+@node Description<3>,Signals,Synopsis<3>,anastasis-httpd 1
+@anchor{manpages/anastasis-httpd 1 description}@anchor{a2}
+@subsubsection Description
 
-@strong{enter_secret:}
 
-This transition provides the reducer with the actual core @code{secret} of the 
user
-that Anastasis is supposed to backup (and possibly recover). The argument is
-simply the Crockford-Base32 encoded @code{value} together with its @code{mime} 
type,
-for example:
+Banastasis-httpd is a command line tool to run the Anastasis (HTTP
+backend).  The required configuration and database must exist before
+running this command.
 
-@example
-@{
-  "secret": @{
-     "value": "EDJP6WK5EG50",
-     "mime" : "text/plain"
-@}
-@end example
+Its options are as follows:
+
+
+@table @asis
+
+@item @strong{-C} | @strong{–connection-close}
+
+Force each HTTP connection to be closed after each request.
+
+@item @strong{-c} @emph{FILENAME} | @strong{––config=}‌@emph{FILENAME}
+
+Use the configuration and other resources for the merchant to operate
+from FILENAME.
+
+@item @strong{-h} | @strong{––help}
+
+Print short help on options.
+
+@item @strong{-v} | @strong{––version}
 
-If the application is unaware of the format, it set the @code{mime} field to 
>>`@w{`}<<null`.
+Print version information.
+@end table
 
-After adding a secret, the reducer may transition into different states
-depending on whether payment(s) are necessary.  If payments are needed, the
-@code{secret} will be stored in the state under @code{core_secret}.  
Applications
-should be careful when persisting the resulting state, as the 
@code{core_secret}
-is not protected in the @code{PAYING} states.  The @code{PAYING} states only 
differ
-in terms of what the payments are for (key shares or the recovery document),
-in all cases the state simply includes an array of Taler URIs that refer to
-payments that need to be made with the Taler wallet.
+@node Signals,See also,Description<3>,anastasis-httpd 1
+@anchor{manpages/anastasis-httpd 1 signals}@anchor{a3}
+@subsubsection Signals
 
-If all payments are complete, the reducer will transition into the
-@code{BACKUP_FINISHED} state and (if applicable) delete the @code{core_secret} 
as an
-additional safety measure.
 
-Example results are thus:
+@strong{anastasis-httpd} responds to the following signals:
 
-@example
-@{
-  "backup_state": "TRUTHS_PAYING",
-  "core_secret" : "DATA",
-  "payments": [
-    "taler://pay/...",
-    "taler://pay/..."
-  ]
-@}
-@end example
 
-@example
-@{
-  "backup_state": "POLICIES_PAYING",
-  "core_secret" : "DATA",
-  "payments": [
-    "taler://pay/...",
-    "taler://pay/..."
-  ]
-@}
-@end example
+@table @asis
 
-@example
-@{
-  "backup_state": "BACKUP_FINISHED",
-@}
-@end example
+@item @code{SIGTERM}
 
-@strong{pay:}
+Sending a SIGTERM to the process will cause it to shutdown cleanly.
+@end table
 
-This transition suggests to the reducer that a payment may have been made or
-is immanent, and that the reducer should check with the Anastasis service
-provider to see if the operation is now possible.  The operation takes one
-optional argument, which is a @code{timeout} value that specifies how long the
-reducer may wait (in long polling) for the payment to complete:
+@node See also,Bugs<3>,Signals,anastasis-httpd 1
+@anchor{manpages/anastasis-httpd 1 see-also}@anchor{a4}
+@subsubsection See also
 
-@example
-@{
-  "timeout":  @{ "d_ms" : 5000 @},
-@}
-@end example
 
-The specified timeout is passed on to the Anastasis service provider(s), which
-will wait this long before giving up.  If no timeout is given, the check is
-done as quickly as possible without additional delays.  The reducer will 
continue
-to either an updated state with the remaining payment requests, to the
-@code{BACKUP_FINISHED} state (if all payments have been completed and the 
backup
-finished), or into an @code{ERROR} state in case there was an irrecoverable 
error,
-indicating the specific provider and how it failed.  An example for this
-final error state would be:
+anastasis-dbinit(1), anastasis-config(1), anastasis-gtk(1), 
anastasis-reducer(1)
 
-@example
-@{
-  "backup_state": "ERROR",
-  "http_status" : 500,
-  "upload_status" : 52,
-  "provider_url" : "https://bad.example.com/";,
-@}
-@end example
+@node Bugs<3>,,See also,anastasis-httpd 1
+@anchor{manpages/anastasis-httpd 1 bugs}@anchor{a5}
+@subsubsection Bugs
 
-Here, the fields have the following meaning:
 
-@quotation
+Report bugs by using @indicateurl{https://bugs.anastasis.lu} or by sending
+electronic mail to <@email{contact@@anastasis.lu}>.
 
+@node anastasis-reducer 1,anastasis conf 5,anastasis-httpd 1,Man Pages
+@anchor{manpages/anastasis-reducer 1 
doc}@anchor{a6}@anchor{manpages/anastasis-reducer 1 
anastasis-reducer-1}@anchor{a7}
+@subsection anastasis-reducer(1)
 
-@itemize -
 
-@item
-@strong{http_status} is the HTTP status returned by the Anastasis provider
 
-@item
-@strong{upload_status} is the Taler error code return by the provider
+@menu
+* Synopsis: Synopsis<4>. 
+* Description: Description<4>. 
+* See Also: See Also<3>. 
+* Bugs: Bugs<4>. 
 
-@item
-@strong{provider_url} is the base URL of the failing provider
-@end itemize
-@end quotation
+@end menu
 
-In the above example, 52 would thus imply that the Anastasis provider failed to
-store information into its database.
+@node Synopsis<4>,Description<4>,,anastasis-reducer 1
+@anchor{manpages/anastasis-reducer 1 synopsis}@anchor{a8}
+@subsubsection Synopsis
 
-@node Recovery transitions,,Backup transitions,Reducer transitions
-@anchor{anastasis recovery-transitions}@anchor{2f}
-@subsection Recovery transitions
 
+@strong{anastasis-reducer}
+[@strong{-a**_*JSON*_|_}–arguments=@emph{JSON}]
+[@strong{-b**_|_}–backup]
+[@strong{-c} @emph{FILENAME} | @strong{––config=}‌@emph{FILENAME}]
+[@strong{-h} | @strong{––help}]
+[@strong{-L} @emph{LOGLEVEL} | @strong{––loglevel=}‌@emph{LOGLEVEL}]
+[@strong{-l} @emph{FILENAME} | @strong{––logfile=}‌@emph{FILENAME}]
+[@strong{-r**_|_}–restore]
+[@strong{-v} | @strong{––version}] COMMAND
 
-@strong{enter_user_attributes:}
+@node Description<4>,See Also<3>,Synopsis<4>,anastasis-reducer 1
+@anchor{manpages/anastasis-reducer 1 description}@anchor{a9}
+@subsubsection Description
 
-This transition provides the user’s personal attributes. The specific set of
-attributes required depends on the country of residence of the user.  Some
-attributes may be optional, in which case they should be omitted entirely
-(that is, not simply be set to @code{null} or an empty string).  The
-arguments are identical to the >>**<<>>enter_user_attributes__<< transition 
from
-the backup process.  Example arguments would thus be:
 
-@example
-@{
-  "identity_attributes": @{
-    "full_name": "Max Musterman",
-    "social_security_number": "123456789",
-    "birthdate": "2000-01-01",
-    "birthplace": "Earth"
-  @}
-@}
-@end example
+@strong{anastasis-reducer} is a command-line tool to run Anastasis
+key recover and backup operations using a reducer-style interface.
+The reducer will read the current state from standard input and
+write the resulting state to standard output.  A COMMAND must
+be given on the command line.  The arguments (if any) are to
+be given in JSON format to the @strong{-a} option.  A list of
+commands can be found in the @ref{55,,Reducer API}
+chapter.
 
-However, in contrast to the backup process, the reducer will attempt to
-retrieve the latest recovery document from all known providers for the
-selected currency given the above inputs.  If a recovery document was found
-by any provider, the reducer will attempt to load it and transition to
-a state where the user can choose which challenges to satisfy:
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SELECTING",
-  "recovery_information": @{
-    "challenges": [
-      @{
-        "uuid": "MW2R3RCBZPHNC78AW8AKWRCHF9KV3Y82EN62T831ZP54S3K5599G",
-        "cost": "TESTKUDOS:0",
-        "type": "question",
-        "instructions": "q1"
-      @},
-      @{
-        "uuid": "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
-        "cost": "TESTKUDOS:0",
-        "type": "email",
-        "instructions": "e-mail address m?il@@f*.bar"
-      @}
-    ],
-    "policies": [
-      [
-        @{
-          "uuid": "MW2R3RCBZPHNC78AW8AKWRCHF9KV3Y82EN62T831ZP54S3K5599G"
-        @},
-        @{
-          "uuid": "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0"
-        @}
-      ]
-    ],
-    "provider_url": "http://localhost:8088/";,
-    "version": 1
-  @},
-  "recovery_document": @{
-    ...
-  @}
-@}
-@end example
+@table @asis
 
-The @code{recovery_document} is an internal representation of the recovery
-information and of no concern to the user interface. The pertinent information
-is in the @code{recovery_information}. Here, the @code{challenges} array is a 
list
-of possible challenges the user could attempt to solve next, while 
@code{policies}
-is an array of policies, with each policy being an array of challenges.
-Satisfying all of the challenges of one of the policies will enable the secret
-to be recovered.  The @code{provider_url} from where the recovery document was
-obtained and its @code{version} are also provided.  Each challenge comes with
-four mandatory fields:
+@item @strong{-a} @emph{JSON} | @strong{––arguments=}@emph{JSON}
 
-@quotation
+Provide JSON inputs for the given command.
 
+@item @strong{-b} | @strong{–backup}
 
-@itemize -
+Begin fresh reducer operation for a back up operation.
 
-@item
-@strong{uuid}: a unique identifier of the challenge; this is what the
-UUIDs in the policies array refer to, but also this UUID may be
-included in messages sent to the user. They allow the user to
-distinguish different PIN/TANs should say the same phone number be
-used for SMS-authentication with different providers.
+@item @strong{-c} @emph{FILENAME} | @strong{––config=}‌@emph{FILENAME}
 
-@item
-@strong{cost}: this is the amount the Anastasis provider will charge
-to allow the user to pass the challenge.
+Use the configuration from @emph{FILENAME}.
 
-@item
-@strong{type}: this is the type of the challenge, as a string.
+@item @strong{-h} | @strong{––help}
 
-@item
-@strong{instructions}: contains additional important hints for the user
-to allow the user to satisfy the challenge.  It typically includes
-an abbreviated form of the contact information or the security
-question. Details depend on @code{type}.
-@end itemize
-@end quotation
+Print short help on options.
 
-If a recovery document was not found, either the user never performed
-a backup, entered incorrect attributes or used a provider not yet in
-the list of Anastasis providers.  Hence, the user must now either
-select a different provider, or go @code{back} and update the identity
-attributes.  In the case a recovery document was not found, the
-transition fails, returning the error code and a human-readable error
-message together with a transition failure:
+@item @strong{-L} @emph{LOGLEVEL} | @strong{––loglevel=}‌@emph{LOGLEVEL}
 
-@example
-@{
-  "recovery_state": "ERROR",
-  "error_message": "account unknown to Anastasis server",
-  "error_code": 9,
-@}
-@end example
+Specifies the log level to use. Accepted values are: @code{DEBUG}, @code{INFO},
+@code{WARNING}, @code{ERROR}.
 
-Here, the @code{error_code} is from the @code{enum ANASTASIS_RecoveryStatus}
-and describes precisely what failed about the download, while the
-@code{error_message} is a human-readable (English) explanation of the code.
-Applications may want to translate the message using GNU gettext;
-translations should be available in the “anastasis” text domain.
-However, in general it should be sufficient to display the slightly
-more generic Taler error code that is returned with the new state.
+@item @strong{-l} @emph{FILENAME} | @strong{––logfile=}‌@emph{FILENAME}
 
-@strong{change_version:}
+Send logging output to @emph{FILENAME}.
 
-Even if a recovery document was found, it is possible that the user
-intended to recover a different version, or recover a backup where
-the recovery document is stored at a different provider. Thus, the
-reducer allows the user to explicitly switch to a different provider
-or recovery document version using the @code{change_version} transition,
-which takes a provider URL and policy version as arguments:
+@item @strong{-r} | @strong{–restore}
 
-@example
-@{
-  "provider_url": "https://localhost:8080/";,
-  "version": 2
-@}
-@end example
+Begin fresh reducer operation for a restore operation.
 
-Note that using a version of 0 implies fetching @code{the latest version}.  The
-resulting states are the same as those of the @code{enter_user_attributes}
-transition, except that the recovery document version is not necessarily the
-latest available version at the provider.
+@item @strong{-v} | @strong{––version}
 
-@strong{select_challenge:}
+Print version information.
+@end table
 
-Selecting a challenge takes different, depending on the state of the payment.
-A comprehensive example for @code{select_challenge} would be:
+@node See Also<3>,Bugs<4>,Description<4>,anastasis-reducer 1
+@anchor{manpages/anastasis-reducer 1 see-also}@anchor{aa}
+@subsubsection See Also
 
-@example
-@{
-    "uuid": "80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30"
-    "timeout" : @{ "d_ms" : 5000 @},
-    "payment_secret": "3P4561HAMHRRYEYD6CM6J7TS5VTD5SR2K2EXJDZEFSX92XKHR4KG"
-@}
-@end example
 
-The @code{uuid} field is mandatory and specifies the selected challenge.
-The other fields are optional, and are needed in case the user has
-previously been requested to pay for the challenge.  In this case,
-the @code{payment_secret} identifies the previous payment request, and
-@code{timeout} says how long the Anastasis service should wait for the
-payment to be completed before giving up (long polling).
+anastasis-gtk(1), anastasis-httpd(1), anastasis.conf(5).
 
-Depending on the type of the challenge and the need for payment, the
-reducer may transition into @code{CHALLENGE_SOLVING} or @code{CHALLENGE_PAYING}
-states.  In @code{CHALLENGE_SOLVING}, the new state will primarily specify
-the selected challenge:
+@node Bugs<4>,,See Also<3>,anastasis-reducer 1
+@anchor{manpages/anastasis-reducer 1 bugs}@anchor{ab}
+@subsubsection Bugs
 
-@example
-@{
-  "backup_state": "CHALLENGE_SOLVING",
-  "selected_challenge_uuid": 
"80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30"
-@}
-@end example
 
-In @code{CHALLENGE_PAYING}, the new state will include instructions for payment
-in the @code{challenge_feedback}. In general, @code{challenge_feedback} 
includes
-information about attempted challenges, with the final state being 
@code{solved}:
+Report bugs by using @indicateurl{https://bugs.anastasis.lu/} or by sending 
electronic
+mail to <@email{contact@@anastasis.lu}>.
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SELECTING",
-  "recovery_information": @{
-    // ...
-  @}
-  "challenge_feedback": @{
-    "80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30" : @{
-      "state" : "solved"
-    @}
-  @}
-@}
-@end example
+@node anastasis conf 5,,anastasis-reducer 1,Man Pages
+@anchor{manpages/anastasis conf 5 doc}@anchor{ac}@anchor{manpages/anastasis 
conf 5 anastasis-conf-5}@anchor{ad}
+@subsection anastasis.conf(5)
 
-Challenges feedback for a challenge can have many different @code{state} values
-that applications must all handle. States other than @code{solved} are:
 
-@quotation
 
+@menu
+* Description: Description<5>. 
+* SEE ALSO:: 
+* BUGS:: 
 
-@itemize -
+@end menu
 
-@item
-@strong{payment}: Here, the user must pay for a challenge. An example would be:
+@node Description<5>,SEE ALSO,,anastasis conf 5
+@anchor{manpages/anastasis conf 5 description}@anchor{ae}
+@subsubsection Description
+
+
+The configuration file is line-oriented.
+Blank lines and whitespace at the beginning and end of a line are ignored.
+Comments start with @code{#} or @code{%} in the first column
+(after any beginning-of-line whitespace) and go to the end of the line.
+
+The file is split into sections.
+Every section begins with “[SECTIONNAME]” and
+contains a number of options of the form “OPTION=VALUE”.
+There may be whitespace around the @code{=} (equal sign).
+Section names and options are @emph{case-insensitive}.
+
+The values, however, are @emph{case-sensitive}.
+In particular, boolean values are one of @code{YES} or @code{NO}.
+Values can include whitespace by surrounding
+the entire value with @code{"} (double quote).
+Note, however, that there are no escape characters in such strings;
+all characters between the double quotes (including other double quotes)
+are taken verbatim.
+
+Values that represent filenames can begin with a @code{/bin/sh}-like
+variable reference.
+This can be simple, such as @code{$TMPDIR/foo}, or complex,
+such as @code{$@{TMPDIR:-$@{TMP:-/tmp@}@}/foo}.
+See @code{[PATHS]} (below).
+
+Values that represent a time duration are represented as a series of one or
+more @code{NUMBER UNIT} pairs, e.g. @code{60 s}, @code{4 weeks 1 day}, @code{5 
years 2 minutes}.
+
+Values that represent an amount are in the usual amount syntax:
+@code{CURRENCY:VALUE.FRACTION}, e.g. @code{EUR:1.50}.
+The @code{FRACTION} portion may extend up to 8 places.
+
+Files containing default values for many of the options described below
+are installed under @code{$ANASTASIS_PREFIX/share/taler/config.d/}.
+The configuration file given with @strong{-c} to Anastasis binaries
+overrides these defaults.
+
+A configuration file may include another, by using the @code{@@INLINE@@} 
directive,
+for example, in @code{main.conf}, you could write @code{@@INLINE@@ sub.conf} to
+include the entirety of @code{sub.conf} at that point in @code{main.conf}.
+.. TODO: Document ‘anastasis-config -V’ in light of ‘@@INLINE@@’ in 
taler-config(1).
 
-@example
-@{
-  "backup_state": "CHALLENGE_PAYING",
-  "selected_challenge_uuid": 
"80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30",
-  "challenge_feedback": @{
-    "80H646H5ZBR453C02Y5RT55VQSJZGM5REWFXVY0SWXY1TNE8CT30" : @{
-     "state" : "payment",
-     "taler_pay_uri" : "taler://pay/...",
-     "provider" : "https://localhost:8080/";,
-     "payment_secret" : "3P4561HAMHRRYEYD6CM6J7TS5VTD5SR2K2EXJDZEFSX92XKHR4KG"
-    @}
-  @}
-@}
-@end example
-@end itemize
+@menu
+* GLOBAL OPTIONS:: 
+* Authorization options:: 
+* Postgres database configuration:: 
+
+@end menu
+
+@node GLOBAL OPTIONS,Authorization options,,Description<5>
+@anchor{manpages/anastasis conf 5 global-options}@anchor{af}
+@subsubsection GLOBAL OPTIONS
+
+
+The following options are from the @code{[anastasis]} section and used by
+the @strong{anastasis-httpd} service.
 
-@quotation
 
+@table @asis
 
-@itemize -
+@item PAYMENT_BACKEND_URL
 
-@item
-@strong{body}: Here, the server provided an HTTP reply for
-how to solve the challenge, but the reducer could not parse
-them into a known format. A mime-type may be provided and may
-help parse the details.
+Base-URL of the Taler merchant backend instance to use for payments.
+FIXME: How do we pass the access token?
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SOLVING",
-  "recovery_information": @{
-    // ...
-  @}
-  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
-  "challenge_feedback": @{
-    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
-      "state": "body",
-      "body": "CROCKFORDBASE32ENCODEDBODY",
-      "http_status": 403,
-      "mime_type" : "anything/possible"
-    @}
-  @}
-@}
-@end example
+@item ANNUAL_FEE
 
-@item
-@strong{hint}: Here, the server provided human-readable hint for
-how to solve the challenge.  Note that the @code{hint} provided this
-time is from the Anastasis provider and may differ from the @code{instructions}
-for the challenge under @code{recovery_information}:
+Annual fee to be paid for policy uploads, i.e. “EUR:1.5”.
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SOLVING",
-  "recovery_information": @{
-    // ...
-  @}
-  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
-  "challenge_feedback": @{
-    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
-      "state": "hint",
-      "hint": "Recovery TAN send to email mail@@DOMAIN",
-      "http_status": 403
-    @}
-  @}
-@}
-@end example
+@item TRUTH_UPLOAD_FEE
 
-@item
-@strong{details}: Here, the server provided a detailed JSON status response
-related to solving the challenge:
+Annual fee to be paid for truth uploads, i.e. “EUR:1.5”.
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SOLVING",
-  "recovery_information": @{
-    // ...
-  @}
-  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
-  "challenge_feedback": @{
-    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
-      "state": "details",
-      "details": @{
-        "code": 8111,
-        "hint": "The client's response to the challenge was invalid.",
-        "detail" : null
-      @},
-      "http_status": 403
-    @}
-  @}
-@}
-@end example
-@end itemize
+@item DB
 
-@quotation
+Database backend to use, only @code{postgres} is supported right now.
 
+@item UPLOAD_LIMIT_MB
 
-@itemize -
+Maximum upload size for policy uploads in megabytes. Default is 1.
 
-@item
-@strong{redirect}: To solve the challenge, the user must visit the indicated
-Web site at @code{redirect_url}, for example to perform video authentication:
-@end itemize
+@item ANNUAL_POLICY_UPLOAD_LIMIT
 
-@quotation
+Maximum number of policies uploaded per year of service. Default is 42.
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SOLVING",
-  "recovery_information": @{
-    // ...
-  @}
-  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
-  "challenge_feedback": @{
-    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
-      "state": "redirect",
-      "redirect_url": "https://videoconf.example.com/";,
-      "http_status": 303
-    @}
-  @}
-@}
-@end example
+@item BUSINESS_NAME
 
+Name of the business.
 
-@itemize -
+@item SERVER_SALT
 
-@item
-@strong{server-failure}: This indicates that the Anastasis provider encountered
-a failure and recovery using this challenge cannot proceed at this time.
-Examples for failures might be that the provider is unable to send SMS
-messages at this time due to an outage.  The body includes details about
-the failure. The user may try again later or continue with other challenges.
-@end itemize
+Must be set to a high-entropy random server salt that the provider must never
+change after the initial configuration.
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SELECTING",
-  "recovery_information": @{
-    // ...
-  @}
-  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
-  "challenge_feedback": @{
-    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
-      "state": "server-failure",
-      "http_status": "500",
-      "error_code": 52
-    @}
-  @}
-@}
-@end example
+@item PORT
 
+TCP port on which the HTTP service should listen on.
+@end table
 
-@itemize -
+@node Authorization options,Postgres database configuration,GLOBAL 
OPTIONS,Description<5>
+@anchor{manpages/anastasis conf 5 authorization-options}@anchor{b0}
+@subsubsection Authorization options
 
-@item
-@strong{truth-unknown}: This indicates that the Anastasis provider is unaware 
of
-the specified challenge. This is typically a permanent failure, and user
-interfaces should not allow users to re-try this challenge.
-@end itemize
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SELECTING",
-  "recovery_information": @{
-    // ...
-  @}
-  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
-  "challenge_feedback": @{
-    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
-      "state": "truth-unknown",
-      "error_code": 8108
-    @}
-  @}
-@}
-@end example
+For each active authorization plugin, options must be configured in
+a section called @code{[authorization-$PLUGIN]} where @code{$PLUGIN} is
+the name of the authorization plugin.
 
 
-@itemize -
+@table @asis
 
-@item
-@strong{rate-limit-exceeded}:
-@end itemize
+@item COST
 
-@example
-@{
-  "recovery_state": "CHALLENGE_SELECTING",
-  "recovery_information": @{
-    // ...
-  @}
-  "selected_challenge_uuid": 
"TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0",
-  "challenge_feedback": @{
-    "TXYKGE1SJZHJ4M2FKSV1P2RZVNTHZFB9E3A79QE956D3SCAWXPK0": @{
-      "state": "rate-limit-exceeded",
-      "error_code": 8121
-    @}
-  @}
-@}
-@end example
-@end quotation
-@end quotation
-@end quotation
-@end quotation
+Fee the user has to pay to obtain a challenge from this
+authorization plugin during recovery.
 
-@strong{pay:}
+@item ENABLED
 
-With a @code{pay} transition, the application indicates to the reducer that
-a payment may have been made. Here, it is again possible to specify an
-optional @code{timeout} argument for long-polling, for example:
+@code{yes} to enable this plugin, @code{no} to disable.
 
-@example
-@{
-    "payment_secret": "ABCDADF242525AABASD52525235ABABFDABABANALASDAAKASDAS"
-    "timeout" : @{ "d_ms" : 5000 @},
-@}
-@end example
+@item COMMAND
 
-Depending on the type of the challenge and the result of the operation, the
-new state may be @code{CHALLENGE_SOLVING} (if say the SMS was now sent to the
-user), @code{CHALLENGE_SELECTING} (if the answer to the security question was
-correct), @code{RECOVERY_FINISHED} (if this was the last challenge that needed 
to
-be solved) or still @code{CHALLENGE_PAYING} (if the challenge was not actually
-paid for).  For sample messages, see the different types of
-@code{challenge_feedback} in the section about @code{select_challenge}.
+Helper command to run (only relevant for some plugins).
+@end table
 
-@strong{solve_challenge:}
+@node Postgres database configuration,,Authorization options,Description<5>
+@anchor{manpages/anastasis conf 5 postgres-database-configuration}@anchor{b1}
+@subsubsection Postgres database configuration
 
-Solving a challenge takes various formats, depending on the type of the
-challenge and what is known about the answer.  The different supported
-formats are:
 
-@example
-@{
-    "answer": "answer to security question"
-@}
-@end example
+The following options must be in the section @code{[statis-postgres]} if
+@code{postgress} was used for the database under @code{DB} in the
+@code{[anastasis]} section.
 
-@example
-@{
-    "pin": 1234
-@}
-@end example
 
-@example
-@{
-    "hash": "SOMEBASE32ENCODEDHASHVALUE"
-@}
-@end example
+@table @asis
 
-@node Authentication Methods,,Anastasis Reducer API,Top
-@anchor{anastasis anastasis-auth-methods}@anchor{30}@anchor{anastasis 
authentication-methods}@anchor{31}
-@chapter Authentication Methods
+@item CONFIG
 
+Path under which the Postgres database is that the service
+should use, i.e. @code{postgres://anastasis}.
+@end table
 
-This section describes the supported authentication methods in detail.  We
-note that the server implements rate limiting for all authentication methods
-to ensure that malicious strong attackers cannot guess the values by
-brute-force. Typically, a user is given three attempts per hour to enter the
-correct code from 2^63 possible values.  Transmitted codes also come with an
-expiration date. If the user re-requests a challenge to be sent, the same
-challenge may be transmitted (with the three attempts counter not increasing!)
-for a limited period of time (depending on the authentication method) before
-the service eventually rotates to a fresh random code with a fresh retry
-counter. Given the default value range and time intervals (which providers are
-at liberty to adjust), brute-force attacks against this are expected to
-succeed with a 50% probability after about 200000 years of attempts at the
-maximum permissible frequency.
+@node SEE ALSO,BUGS,Description<5>,anastasis conf 5
+@anchor{manpages/anastasis conf 5 see-also}@anchor{b2}
+@subsubsection SEE ALSO
 
-@menu
-* SMS (sms): SMS sms.
-* Email verification (email): Email verification email.
-* Video identification (vid): Video identification vid.
-* Security question (qa): Security question qa.
-* Snail mail verification (post): Snail mail verification post.
 
-@end menu
+anastasis-httpd(1), anastasis-config(1)
 
-@node SMS sms,Email verification email,,Authentication Methods
-@anchor{anastasis sms-sms}@anchor{32}
-@section SMS (sms)
+@node BUGS,,SEE ALSO,anastasis conf 5
+@anchor{manpages/anastasis conf 5 bugs}@anchor{b3}
+@subsubsection BUGS
 
 
-Sends an SMS with a code (prefixed with @code{A-}) to the user’s phone, 
including
-a UUID which identifies the challenge the code is for.  The user must send
-this code back with his request (see @code{$RESPONSE} under @ref{1e,,Managing 
truth}).
-If the transmitted code is correct, the server responses with the requested
-encrypted key share.
+Report bugs by using @indicateurl{https://bugs.anastasis.lu/} or by sending 
electronic
+mail to <@email{contact@@anastasis.lu}>.
 
-@node Email verification email,Video identification vid,SMS sms,Authentication 
Methods
-@anchor{anastasis email-verification-email}@anchor{33}
-@section Email verification (email)
+@node Complete Index,GNU Free Documentation License,Man Pages,Documentation 
Overview
+@anchor{genindex doc}@anchor{b4}@anchor{genindex complete-index}@anchor{b5}
+@section Complete Index
 
 
-Sends an email with a code (prefixed with @code{A-}) to the user’s mail 
address,
-including a UUID which identifies the challenge the code is for.  The user
-must send this code back with his request (see @code{$RESPONSE} under 
@ref{1e,,Managing truth}).  If the transmitted code is correct, the server 
responses with the
-requested encrypted key share.
+@node GNU Free Documentation License,,Complete Index,Documentation Overview
+@anchor{fdl-1 3 doc}@anchor{b6}@anchor{fdl-1 3 
gnu-fdl-1-3}@anchor{b7}@anchor{fdl-1 3 
gnu-free-documentation-license}@anchor{b8}
+@section GNU Free Documentation License
 
-@node Video identification vid,Security question qa,Email verification 
email,Authentication Methods
-@anchor{anastasis video-identification-vid}@anchor{34}
-@section Video identification (vid)
 
+Version 1.3, 3 November 2008
 
-Requires the user to identify via video-call.  In the video-call, the
-user is told the code (prefixed with @code{A-}) needed to authenticate.
+Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation,
+Inc. @indicateurl{https://fsf.org/}
 
-The user is expected to delete all metadata revealing information about per
-from the images before uploading them. Since the respective images must be
-passed on to the video identification service in the event of password
-recovery, it should be ensured that no further information about the user can
-be derived from them.
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
 
-Video identification will typically result in the Anastasis provider
-requesting the user to be redirected to a Web site (or other URL) for the
-video-call.
+@menu
+* 0. PREAMBLE: 0 PREAMBLE. 
+* 1. APPLICABILITY AND DEFINITIONS: 1 APPLICABILITY AND DEFINITIONS. 
+* 2. VERBATIM COPYING: 2 VERBATIM COPYING. 
+* 3. COPYING IN QUANTITY: 3 COPYING IN QUANTITY. 
+* 4. MODIFICATIONS: 4 MODIFICATIONS. 
+* 5. COMBINING DOCUMENTS: 5 COMBINING DOCUMENTS. 
+* 6. COLLECTIONS OF DOCUMENTS: 6 COLLECTIONS OF DOCUMENTS. 
+* 7. AGGREGATION WITH INDEPENDENT WORKS: 7 AGGREGATION WITH INDEPENDENT WORKS. 
+* 8. TRANSLATION: 8 TRANSLATION. 
+* 9. TERMINATION: 9 TERMINATION. 
+* 10. FUTURE REVISIONS OF THIS LICENSE: 10 FUTURE REVISIONS OF THIS LICENSE. 
+* 11. RELICENSING: 11 RELICENSING. 
+* ADDENDUM; How to use this License for your documents: ADDENDUM How to use 
this License for your documents. 
 
-@node Security question qa,Snail mail verification post,Video identification 
vid,Authentication Methods
-@anchor{anastasis security-question-qa}@anchor{35}
-@section Security question (qa)
+@end menu
 
+@node 0 PREAMBLE,1 APPLICABILITY AND DEFINITIONS,,GNU Free Documentation 
License
+@anchor{fdl-1 3 preamble}@anchor{b9}
+@subsection 0. PREAMBLE
+
+
+The purpose of this License is to make a manual, textbook, or other
+functional and useful document “free” in the sense of freedom: to assure
+everyone the effective freedom to copy and redistribute it, with or
+without modifying it, either commercially or noncommercially.
+Secondarily, this License preserves for the author and publisher a way
+to get credit for their work, while not being considered responsible for
+modifications made by others.
+
+This License is a kind of “copyleft”, which means that derivative works
+of the document must themselves be free in the same sense. It
+complements the GNU General Public License, which is a copyleft license
+designed for free software.
+
+We have designed this License in order to use it for manuals for free
+software, because free software needs free documentation: a free program
+should come with manuals providing the same freedoms that the software
+does. But this License is not limited to software manuals; it can be
+used for any textual work, regardless of subject matter or whether it is
+published as a printed book. We recommend this License principally for
+works whose purpose is instruction or reference.
+
+@node 1 APPLICABILITY AND DEFINITIONS,2 VERBATIM COPYING,0 PREAMBLE,GNU Free 
Documentation License
+@anchor{fdl-1 3 applicability-and-definitions}@anchor{ba}
+@subsection 1. APPLICABILITY AND DEFINITIONS
+
+
+This License applies to any manual or other work, in any medium, that
+contains a notice placed by the copyright holder saying it can be
+distributed under the terms of this License. Such a notice grants a
+world-wide, royalty-free license, unlimited in duration, to use that
+work under the conditions stated herein. The “Document”, below, refers
+to any such manual or work. Any member of the public is a licensee, and
+is addressed as “you”. You accept the license if you copy, modify or
+distribute the work in a way requiring permission under copyright law.
+
+A “Modified Version” of the Document means any work containing the
+Document or a portion of it, either copied verbatim, or with
+modifications and/or translated into another language.
+
+A “Secondary Section” is a named appendix or a front-matter section of
+the Document that deals exclusively with the relationship of the
+publishers or authors of the Document to the Document’s overall subject
+(or to related matters) and contains nothing that could fall directly
+within that overall subject. (Thus, if the Document is in part a
+textbook of mathematics, a Secondary Section may not explain any
+mathematics.) The relationship could be a matter of historical
+connection with the subject or with related matters, or of legal,
+commercial, philosophical, ethical or political position regarding them.
+
+The “Invariant Sections” are certain Secondary Sections whose titles are
+designated, as being those of Invariant Sections, in the notice that
+says that the Document is released under this License. If a section does
+not fit the above definition of Secondary then it is not allowed to be
+designated as Invariant. The Document may contain zero Invariant
+Sections. If the Document does not identify any Invariant Sections then
+there are none.
+
+The “Cover Texts” are certain short passages of text that are listed, as
+Front-Cover Texts or Back-Cover Texts, in the notice that says that the
+Document is released under this License. A Front-Cover Text may be at
+most 5 words, and a Back-Cover Text may be at most 25 words.
+
+A “Transparent” copy of the Document means a machine-readable copy,
+represented in a format whose specification is available to the general
+public, that is suitable for revising the document straightforwardly
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+
+Examples of suitable formats for Transparent copies include plain ASCII
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+
+The “Title Page” means, for a printed book, the title page itself, plus
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+
+The “publisher” means any person or entity that distributes copies of
+the Document to the public.
+
+A section “Entitled XYZ” means a named subunit of the Document whose
+title either is precisely XYZ or contains XYZ in parentheses following
+text that translates XYZ in another language. (Here XYZ stands for a
+specific section name mentioned below, such as “Acknowledgements”,
+“Dedications”, “Endorsements”, or “History”.) To “Preserve the Title” of
+such a section when you modify the Document means that it remains a
+section “Entitled XYZ” according to this definition.
+
+The Document may include Warranty Disclaimers next to the notice which
+states that this License applies to the Document. These Warranty
+Disclaimers are considered to be included by reference in this License,
+but only as regards disclaiming warranties: any other implication that
+these Warranty Disclaimers may have is void and has no effect on the
+meaning of this License.
+
+@node 2 VERBATIM COPYING,3 COPYING IN QUANTITY,1 APPLICABILITY AND 
DEFINITIONS,GNU Free Documentation License
+@anchor{fdl-1 3 verbatim-copying}@anchor{bb}
+@subsection 2. VERBATIM COPYING
+
+
+You may copy and distribute the Document in any medium, either
+commercially or noncommercially, provided that this License, the
+copyright notices, and the license notice saying this License applies to
+the Document are reproduced in all copies, and that you add no other
+conditions whatsoever to those of this License. You may not use
+technical measures to obstruct or control the reading or further copying
+of the copies you make or distribute. However, you may accept
+compensation in exchange for copies. If you distribute a large enough
+number of copies you must also follow the conditions in section 3.
+
+You may also lend copies, under the same conditions stated above, and
+you may publicly display copies.
+
+@node 3 COPYING IN QUANTITY,4 MODIFICATIONS,2 VERBATIM COPYING,GNU Free 
Documentation License
+@anchor{fdl-1 3 copying-in-quantity}@anchor{bc}
+@subsection 3. COPYING IN QUANTITY
+
+
+If you publish printed copies (or copies in media that commonly have
+printed covers) of the Document, numbering more than 100, and the
+Document’s license notice requires Cover Texts, you must enclose the
+copies in covers that carry, clearly and legibly, all these Cover Texts:
+Front-Cover Texts on the front cover, and Back-Cover Texts on the back
+cover. Both covers must also clearly and legibly identify you as the
+publisher of these copies. The front cover must present the full title
+with all words of the title equally prominent and visible. You may add
+other material on the covers in addition. Copying with changes limited
+to the covers, as long as they preserve the title of the Document and
+satisfy these conditions, can be treated as verbatim copying in other
+respects.
+
+If the required texts for either cover are too voluminous to fit
+legibly, you should put the first ones listed (as many as fit
+reasonably) on the actual cover, and continue the rest onto adjacent
+pages.
+
+If you publish or distribute Opaque copies of the Document numbering
+more than 100, you must either include a machine-readable Transparent
+copy along with each Opaque copy, or state in or with each Opaque copy a
+computer-network location from which the general network-using public
+has access to download using public-standard network protocols a
+complete Transparent copy of the Document, free of added material. If
+you use the latter option, you must take reasonably prudent steps, when
+you begin distribution of Opaque copies in quantity, to ensure that this
+Transparent copy will remain thus accessible at the stated location
+until at least one year after the last time you distribute an Opaque
+copy (directly or through your agents or retailers) of that edition to
+the public.
+
+It is requested, but not required, that you contact the authors of the
+Document well before redistributing any large number of copies, to give
+them a chance to provide you with an updated version of the Document.
+
+@node 4 MODIFICATIONS,5 COMBINING DOCUMENTS,3 COPYING IN QUANTITY,GNU Free 
Documentation License
+@anchor{fdl-1 3 modifications}@anchor{bd}
+@subsection 4. MODIFICATIONS
+
+
+You may copy and distribute a Modified Version of the Document under the
+conditions of sections 2 and 3 above, provided that you release the
+Modified Version under precisely this License, with the Modified Version
+filling the role of the Document, thus licensing distribution and
+modification of the Modified Version to whoever possesses a copy of it.
+In addition, you must do these things in the Modified Version:
 
-Asks the user a security question.  The user sends back a @strong{salted}
-hash over the answer.  The @strong{question-salt} is stored encrypted as
-part of the recovery document and never revealed to the providers. This
-ensures that providers cannot derive the answer from the hash value.
-Furthermore, the security question itself is also only in the recovery
-document and never given to the Anastasis provider.  A moderately expensive
-hash function is used to further limit strong attackers that have obtained
-the recovery document from brute-forcing the answer.
 
-If the hash value matches with the one the server is expecting, the server
-answers with the requested encrypted key share.  However, unlike other
-encrypted key shares, the encrypted key share of a security question uses a
-special variation of the Anastasis encryption: Here, a different hash function
-over the security answer is used to provide an additional @strong{key-salt} 
for the
-decryption of the (encrypted) @strong{key share}.  This ensures that the key 
share
-remains irrecoverable without the answer even if the Anastasis provider
-storing the security question is malicious.
+@itemize -
 
-@node Snail mail verification post,,Security question qa,Authentication Methods
-@anchor{anastasis snail-mail-verification-post}@anchor{36}
-@section Snail mail verification (post)
+@item 
+A. Use in the Title Page (and on the covers, if any) a title distinct
+from that of the Document, and from those of previous versions (which
+should, if there were any, be listed in the History section of the
+Document). You may use the same title as a previous version if the
+original publisher of that version gives permission.
+
+@item 
+B. List on the Title Page, as authors, one or more persons or
+entities responsible for authorship of the modifications in the
+Modified Version, together with at least five of the principal
+authors of the Document (all of its principal authors, if it has
+fewer than five), unless they release you from this requirement.
+
+@item 
+C. State on the Title page the name of the publisher of the Modified
+Version, as the publisher.
+
+@item 
+
+@enumerate 4
+
+@item 
+Preserve all the copyright notices of the Document.
+@end enumerate
+
+@item 
+E. Add an appropriate copyright notice for your modifications
+adjacent to the other copyright notices.
+
+@item 
+F. Include, immediately after the copyright notices, a license notice
+giving the public permission to use the Modified Version under the
+terms of this License, in the form shown in the Addendum below.
+
+@item 
+G. Preserve in that license notice the full lists of Invariant
+Sections and required Cover Texts given in the Document’s license
+notice.
+
+@item 
+
+@enumerate 8
+
+@item 
+Include an unaltered copy of this License.
+@end enumerate
+
+@item 
+I. Preserve the section Entitled “History”, Preserve its Title, and
+add to it an item stating at least the title, year, new authors, and
+publisher of the Modified Version as given on the Title Page. If
+there is no section Entitled “History” in the Document, create one
+stating the title, year, authors, and publisher of the Document as
+given on its Title Page, then add an item describing the Modified
+Version as stated in the previous sentence.
+
+@item 
+J. Preserve the network location, if any, given in the Document for
+public access to a Transparent copy of the Document, and likewise the
+network locations given in the Document for previous versions it was
+based on. These may be placed in the “History” section. You may omit
+a network location for a work that was published at least four years
+before the Document itself, or if the original publisher of the
+version it refers to gives permission.
+
+@item 
+K. For any section Entitled “Acknowledgements” or “Dedications”,
+Preserve the Title of the section, and preserve in the section all
+the substance and tone of each of the contributor acknowledgements
+and/or dedications given therein.
+
+@item 
+L. Preserve all the Invariant Sections of the Document, unaltered in
+their text and in their titles. Section numbers or the equivalent are
+not considered part of the section titles.
+
+@item 
+M. Delete any section Entitled “Endorsements”. Such a section may not
+be included in the Modified Version.
+
+@item 
+N. Do not retitle any existing section to be Entitled “Endorsements”
+or to conflict in title with any Invariant Section.
+
+@item 
+
+@enumerate 15
+
+@item 
+Preserve any Warranty Disclaimers.
+@end enumerate
+@end itemize
 
+If the Modified Version includes new front-matter sections or appendices
+that qualify as Secondary Sections and contain no material copied from
+the Document, you may at your option designate some or all of these
+sections as invariant. To do this, add their titles to the list of
+Invariant Sections in the Modified Version’s license notice. These
+titles must be distinct from any other section titles.
+
+You may add a section Entitled “Endorsements”, provided it contains
+nothing but endorsements of your Modified Version by various
+parties—for example, statements of peer review or that the text has
+been approved by an organization as the authoritative definition of a
+standard.
+
+You may add a passage of up to five words as a Front-Cover Text, and a
+passage of up to 25 words as a Back-Cover Text, to the end of the list
+of Cover Texts in the Modified Version. Only one passage of Front-Cover
+Text and one of Back-Cover Text may be added by (or through arrangements
+made by) any one entity. If the Document already includes a cover text
+for the same cover, previously added by you or by arrangement made by
+the same entity you are acting on behalf of, you may not add another;
+but you may replace the old one, on explicit permission from the
+previous publisher that added the old one.
+
+The author(s) and publisher(s) of the Document do not by this License
+give permission to use their names for publicity for or to assert or
+imply endorsement of any Modified Version.
+
+@node 5 COMBINING DOCUMENTS,6 COLLECTIONS OF DOCUMENTS,4 MODIFICATIONS,GNU 
Free Documentation License
+@anchor{fdl-1 3 combining-documents}@anchor{be}
+@subsection 5. COMBINING DOCUMENTS
+
+
+You may combine the Document with other documents released under this
+License, under the terms defined in section 4 above for modified
+versions, provided that you include in the combination all of the
+Invariant Sections of all of the original documents, unmodified, and
+list them all as Invariant Sections of your combined work in its license
+notice, and that you preserve all their Warranty Disclaimers.
+
+The combined work need only contain one copy of this License, and
+multiple identical Invariant Sections may be replaced with a single
+copy. If there are multiple Invariant Sections with the same name but
+different contents, make the title of each such section unique by adding
+at the end of it, in parentheses, the name of the original author or
+publisher of that section if known, or else a unique number. Make the
+same adjustment to the section titles in the list of Invariant Sections
+in the license notice of the combined work.
+
+In the combination, you must combine any sections Entitled “History” in
+the various original documents, forming one section Entitled “History”;
+likewise combine any sections Entitled “Acknowledgements”, and any
+sections Entitled “Dedications”. You must delete all sections Entitled
+“Endorsements”.
+
+@node 6 COLLECTIONS OF DOCUMENTS,7 AGGREGATION WITH INDEPENDENT WORKS,5 
COMBINING DOCUMENTS,GNU Free Documentation License
+@anchor{fdl-1 3 collections-of-documents}@anchor{bf}
+@subsection 6. COLLECTIONS OF DOCUMENTS
+
+
+You may make a collection consisting of the Document and other documents
+released under this License, and replace the individual copies of this
+License in the various documents with a single copy that is included in
+the collection, provided that you follow the rules of this License for
+verbatim copying of each of the documents in all other respects.
+
+You may extract a single document from such a collection, and distribute
+it individually under this License, provided you insert a copy of this
+License into the extracted document, and follow this License in all
+other respects regarding verbatim copying of that document.
+
+@node 7 AGGREGATION WITH INDEPENDENT WORKS,8 TRANSLATION,6 COLLECTIONS OF 
DOCUMENTS,GNU Free Documentation License
+@anchor{fdl-1 3 aggregation-with-independent-works}@anchor{c0}
+@subsection 7. AGGREGATION WITH INDEPENDENT WORKS
+
+
+A compilation of the Document or its derivatives with other separate and
+independent documents or works, in or on a volume of a storage or
+distribution medium, is called an “aggregate” if the copyright resulting
+from the compilation is not used to limit the legal rights of the
+compilation’s users beyond what the individual works permit. When the
+Document is included in an aggregate, this License does not apply to the
+other works in the aggregate which are not themselves derivative works
+of the Document.
+
+If the Cover Text requirement of section 3 is applicable to these copies
+of the Document, then if the Document is less than one half of the
+entire aggregate, the Document’s Cover Texts may be placed on covers
+that bracket the Document within the aggregate, or the electronic
+equivalent of covers if the Document is in electronic form. Otherwise
+they must appear on printed covers that bracket the whole aggregate.
+
+@node 8 TRANSLATION,9 TERMINATION,7 AGGREGATION WITH INDEPENDENT WORKS,GNU 
Free Documentation License
+@anchor{fdl-1 3 translation}@anchor{c1}
+@subsection 8. TRANSLATION
+
+
+Translation is considered a kind of modification, so you may distribute
+translations of the Document under the terms of section 4. Replacing
+Invariant Sections with translations requires special permission from
+their copyright holders, but you may include translations of some or all
+Invariant Sections in addition to the original versions of these
+Invariant Sections. You may include a translation of this License, and
+all the license notices in the Document, and any Warranty Disclaimers,
+provided that you also include the original English version of this
+License and the original versions of those notices and disclaimers. In
+case of a disagreement between the translation and the original version
+of this License or a notice or disclaimer, the original version will
+prevail.
+
+If a section in the Document is Entitled “Acknowledgements”,
+“Dedications”, or “History”, the requirement (section 4) to Preserve its
+Title (section 1) will typically require changing the actual title.
+
+@node 9 TERMINATION,10 FUTURE REVISIONS OF THIS LICENSE,8 TRANSLATION,GNU Free 
Documentation License
+@anchor{fdl-1 3 termination}@anchor{c2}
+@subsection 9. TERMINATION
+
+
+You may not copy, modify, sublicense, or distribute the Document except
+as expressly provided under this License. Any attempt otherwise to copy,
+modify, sublicense, or distribute it is void, and will automatically
+terminate your rights under this License.
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally terminates
+your license, and (b) permanently, if the copyright holder fails to
+notify you of the violation by some reasonable means prior to 60 days
+after the cessation.
+
+Moreover, your license from a particular copyright holder is reinstated
+permanently if the copyright holder notifies you of the violation by
+some reasonable means, this is the first time you have received notice
+of violation of this License (for any work) from that copyright holder,
+and you cure the violation prior to 30 days after your receipt of the
+notice.
+
+Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License. If your rights have been terminated and not permanently
+reinstated, receipt of a copy of some or all of the same material does
+not give you any rights to use it.
+
+@node 10 FUTURE REVISIONS OF THIS LICENSE,11 RELICENSING,9 TERMINATION,GNU 
Free Documentation License
+@anchor{fdl-1 3 future-revisions-of-this-license}@anchor{c3}
+@subsection 10. FUTURE REVISIONS OF THIS LICENSE
+
+
+The Free Software Foundation may publish new, revised versions of the
+GNU Free Documentation License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns. See 
@indicateurl{https://www.gnu.org/licenses/}.
+
+Each version of the License is given a distinguishing version number. If
+the Document specifies that a particular numbered version of this
+License “or any later version” applies to it, you have the option of
+following the terms and conditions either of that specified version or
+of any later version that has been published (not as a draft) by the
+Free Software Foundation. If the Document does not specify a version
+number of this License, you may choose any version ever published (not
+as a draft) by the Free Software Foundation. If the Document specifies
+that a proxy can decide which future versions of this License can be
+used, that proxy’s public statement of acceptance of a version
+permanently authorizes you to choose that version for the Document.
+
+@node 11 RELICENSING,ADDENDUM How to use this License for your documents,10 
FUTURE REVISIONS OF THIS LICENSE,GNU Free Documentation License
+@anchor{fdl-1 3 relicensing}@anchor{c4}
+@subsection 11. RELICENSING
+
+
+“Massive Multiauthor Collaboration Site” (or “MMC Site”) means any World
+Wide Web server that publishes copyrightable works and also provides
+prominent facilities for anybody to edit those works. A public wiki that
+anybody can edit is an example of such a server. A “Massive Multiauthor
+Collaboration” (or “MMC”) contained in the site means any set of
+copyrightable works thus published on the MMC site.
+
+“CC-BY-SA” means the Creative Commons Attribution-Share Alike 3.0
+license published by Creative Commons Corporation, a not-for-profit
+corporation with a principal place of business in San Francisco,
+California, as well as future copyleft versions of that license
+published by that same organization.
+
+“Incorporate” means to publish or republish a Document, in whole or in
+part, as part of another Document.
+
+An MMC is “eligible for relicensing” if it is licensed under this
+License, and if all works that were first published under this License
+somewhere other than this MMC, and subsequently incorporated in whole or
+in part into the MMC, (1) had no cover texts or invariant sections, and
+(2) were thus incorporated prior to November 1, 2008.
+
+The operator of an MMC Site may republish an MMC contained in the site
+under CC-BY-SA on the same site at any time before August 1, 2009,
+provided the MMC is eligible for relicensing.
+
+@node ADDENDUM How to use this License for your documents,,11 RELICENSING,GNU 
Free Documentation License
+@anchor{fdl-1 3 addendum-how-to-use-this-license-for-your-documents}@anchor{c5}
+@subsection ADDENDUM: How to use this License for your documents
+
+
+To use this License in a document you have written, include a copy of
+the License in the document and put the following copyright and license
+notices just after the title page:
 
-Sends physical mail (snail mail) with a code (prefixed with @code{A-}) to the
-user’s mail address, including a UUID which identifies the challenge the code
-is for.  The user must send this code back with their request (see
-@code{$RESPONSE} under @ref{1e,,Managing truth}).  If the transmitted code is 
correct,
-the server responds with the requested encrypted key share.
+@example
+Copyright (C)  YEAR  YOUR NAME.
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.3
+or any later version published by the Free Software Foundation;
+with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
+A copy of the license is included in the section entitled "GNU
+Free Documentation License".
+@end example
+
+If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
+replace the “with … Texts.” line with this:
+
+@example
+with the Invariant Sections being LIST THEIR TITLES, with the
+Front-Cover Texts being LIST, and with the Back-Cover Texts being LIST.
+@end example
+
+If you have Invariant Sections without Cover Texts, or some other
+combination of the three, merge those two alternatives to suit the
+situation.
+
+If your document contains nontrivial examples of program code, we
+recommend releasing these examples in parallel under your choice of free
+software license, such as the GNU General Public License, to permit
+their use in free software.
+@anchor{rest tsref-type-ErrorDetail}@w{                              }
+@anchor{26}@w{                              }
 
 @c %**end of body
 @bye
diff --git a/doc/sphinx/Makefile b/doc/sphinx/Makefile
new file mode 100644
index 0000000..48030b5
--- /dev/null
+++ b/doc/sphinx/Makefile
@@ -0,0 +1,179 @@
+# Makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+PAPER         =
+BUILDDIR      = _build
+
+# User-friendly check for sphinx-build
+ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
+$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx 
installed, then set the SPHINXBUILD environment variable to point to the full 
path of the '$(SPHINXBUILD)' executable. Alternatively you can add the 
directory with the executable to your PATH. If you don't have Sphinx installed, 
grab it from http://sphinx-doc.org/)
+endif
+
+# Internal variables.
+PAPEROPT_a4     = -D latex_paper_size=a4
+PAPEROPT_letter = -D latex_paper_size=letter
+ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+# the i18n builder cannot share the environment and doctrees with the others
+I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
+
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp 
epub latex latexpdf text man changes linkcheck doctest gettext
+
+help:
+       @echo "Please use \`make <target>' where <target> is one of"
+       @echo "  html       to make standalone HTML files"
+       @echo "  dirhtml    to make HTML files named index.html in directories"
+       @echo "  singlehtml to make a single large HTML file"
+       @echo "  pickle     to make pickle files"
+       @echo "  json       to make JSON files"
+       @echo "  htmlhelp   to make HTML files and a HTML help project"
+       @echo "  qthelp     to make HTML files and a qthelp project"
+       @echo "  devhelp    to make HTML files and a Devhelp project"
+       @echo "  epub       to make an epub"
+       @echo "  latex      to make LaTeX files, you can set PAPER=a4 or 
PAPER=letter"
+       @echo "  latexpdf   to make LaTeX files and run them through pdflatex"
+       @echo "  latexpdfja to make LaTeX files and run them through 
platex/dvipdfmx"
+       @echo "  text       to make text files"
+       @echo "  man        to make manual pages"
+       @echo "  texinfo    to make Texinfo files"
+       @echo "  info       to make Texinfo files and run them through makeinfo"
+       @echo "  gettext    to make PO message catalogs"
+       @echo "  changes    to make an overview of all changed/added/deprecated 
items"
+       @echo "  xml        to make Docutils-native XML files"
+       @echo "  pseudoxml  to make pseudoxml-XML files for display purposes"
+       @echo "  linkcheck  to check all external links for integrity"
+       @echo "  doctest    to run all doctests embedded in the documentation 
(if enabled)"
+
+clean:
+       rm -rf $(BUILDDIR)/*
+
+# The html-linked builder does not support caching, so we
+# remove all cached state first.
+html:
+# -W = exit 1 on warning; --keep-going = complete build anyway; -w 
/tmp/sphinx-warnings.log = write log to ~/warnings.log
+       $(SPHINXBUILD) -b html-linked $(ALLSPHINXOPTS) $(BUILDDIR)/html
+       @echo
+       @echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
+
+dirhtml:
+       $(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
+       @echo
+       @echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
+
+singlehtml:
+       $(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
+       @echo
+       @echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
+
+pickle:
+       $(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
+       @echo
+       @echo "Build finished; now you can process the pickle files."
+
+json:
+       $(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
+       @echo
+       @echo "Build finished; now you can process the JSON files."
+
+htmlhelp:
+       $(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
+       @echo
+       @echo "Build finished; now you can run HTML Help Workshop with the" \
+             ".hhp project file in $(BUILDDIR)/htmlhelp."
+
+qthelp:
+       $(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
+       @echo
+       @echo "Build finished; now you can run "qcollectiongenerator" with the" 
\
+             ".qhcp project file in $(BUILDDIR)/qthelp, like this:"
+       @echo "# qcollectiongenerator $(BUILDDIR)/qthelp/neuro.qhcp"
+       @echo "To view the help file:"
+       @echo "# assistant -collectionFile $(BUILDDIR)/qthelp/neuro.qhc"
+
+devhelp:
+       $(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
+       @echo
+       @echo "Build finished."
+       @echo "To view the help file:"
+       @echo "# mkdir -p $$HOME/.local/share/devhelp/neuro"
+       @echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/neuro"
+       @echo "# devhelp"
+
+epub:
+       $(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
+       @echo
+       @echo "Build finished. The epub file is in $(BUILDDIR)/epub."
+
+latex:
+       $(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+       @echo
+       @echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
+       @echo "Run \`make' in that directory to run these through (pdf)latex" \
+             "(use \`make latexpdf' here to do that automatically)."
+
+latexpdf:
+       $(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+       @echo "Running LaTeX files through pdflatex..."
+       $(MAKE) -C $(BUILDDIR)/latex all-pdf
+       @echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+latexpdfja:
+       $(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+       @echo "Running LaTeX files through platex and dvipdfmx..."
+       $(MAKE) -C $(BUILDDIR)/latex all-pdf-ja
+       @echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+text:
+       $(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
+       @echo
+       @echo "Build finished. The text files are in $(BUILDDIR)/text."
+
+man:
+       $(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
+       @echo
+       @echo "Build finished. The manual pages are in $(BUILDDIR)/man."
+
+texinfo:
+       $(SPHINXBUILD) -b texinfo . $(BUILDDIR)/texinfo ./index.rst -D 
master_doc=index
+       @echo
+       @echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo"
+       @echo "Run \`make' in that directory to run these through makeinfo"
+
+info:
+       $(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+       @echo "Running Texinfo files through makeinfo..."
+       make -C $(BUILDDIR)/texinfo info
+       @echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo."
+
+gettext:
+       $(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
+       @echo
+       @echo "Build finished. The message catalogs are in $(BUILDDIR)/locale."
+
+changes:
+       $(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
+       @echo
+       @echo "The overview file is in $(BUILDDIR)/changes."
+
+linkcheck:
+       $(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
+       @echo
+       @echo "Link check complete; look for any errors in the above output " \
+             "or in $(BUILDDIR)/linkcheck/output.txt."
+
+doctest:
+       $(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
+       @echo "Testing of doctests in the sources finished, look at the " \
+             "results in $(BUILDDIR)/doctest/output.txt."
+
+xml:
+       $(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
+       @echo
+       @echo "Build finished. The XML files are in $(BUILDDIR)/xml."
+
+pseudoxml:
+       $(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
+       @echo
+       @echo "Build finished. The pseudo-XML files are in 
$(BUILDDIR)/pseudoxml."
diff --git a/doc/sphinx/README b/doc/sphinx/README
new file mode 100644
index 0000000..b7f6414
--- /dev/null
+++ b/doc/sphinx/README
@@ -0,0 +1,10 @@
+This repository contains the documentation for all main GNU Taler components.
+
+Before building the documentation, make sure that you have the required
+dependencies installed using pip3:
+
+$ pip3 install --user --upgrade recommonmark sphinx
+
+Note by Buck: when setting up on VM, I also needed:
+
+# apt install texlive-latex-extra graphviz
diff --git a/doc/sphinx/_exts/__pycache__/typescriptdomain.cpython-39.pyc 
b/doc/sphinx/_exts/__pycache__/typescriptdomain.cpython-39.pyc
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diff --git a/doc/sphinx/_exts/httpdomain/__init__.py 
b/doc/sphinx/_exts/httpdomain/__init__.py
new file mode 100644
index 0000000..b5a7dc2
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/__init__.py
@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+"""
+    sphinxcontrib
+    ~~~~~~~~~~~~~
+
+    This package is a namespace package that contains all extensions
+    distributed in the ``sphinx-contrib`` distribution.
+
+    :copyright: Copyright 2007-2009 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+__import__('pkg_resources').declare_namespace(__name__)
+
diff --git a/doc/sphinx/_exts/httpdomain/__pycache__/__init__.cpython-37.pyc 
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diff --git a/doc/sphinx/_exts/httpdomain/autohttp/__init__.py 
b/doc/sphinx/_exts/httpdomain/autohttp/__init__.py
new file mode 100644
index 0000000..95372d4
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/autohttp/__init__.py
@@ -0,0 +1,11 @@
+"""
+    sphinxcontrib.autohttp
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    The sphinx.ext.autodoc-style HTTP API reference builder
+    for sphinxcontrib.httpdomain.
+
+    :copyright: Copyright 2011 by Hong Minhee
+    :license: BSD, see LICENSE for details.
+
+"""
diff --git a/doc/sphinx/_exts/httpdomain/autohttp/bottle.py 
b/doc/sphinx/_exts/httpdomain/autohttp/bottle.py
new file mode 100644
index 0000000..d8c1859
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/autohttp/bottle.py
@@ -0,0 +1,114 @@
+"""
+    sphinxcontrib.autohttp.bottle
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    The sphinx.ext.autodoc-style HTTP API reference builder (from Bottle)
+    for sphinxcontrib.httpdomain.
+
+    :copyright: Copyright 2012 by Jameel Al-Aziz
+    :license: BSD, see LICENSE for details.
+
+"""
+
+import re
+import six
+
+from docutils import nodes
+from docutils.parsers.rst import directives
+from docutils.statemachine import ViewList
+
+from sphinx.util import force_decode
+from sphinx.util.compat import Directive
+from sphinx.util.nodes import nested_parse_with_titles
+from sphinx.util.docstrings import prepare_docstring
+from sphinx.pycode import ModuleAnalyzer
+
+from sphinxcontrib import httpdomain
+from sphinxcontrib.autohttp.common import http_directive, import_object
+
+
+def translate_bottle_rule(app, rule):
+    buf = six.StringIO()
+    if hasattr(app.router, "parse_rule"):
+        iterator = app.router.parse_rule(rule)  # bottle 0.11
+    else:
+        iterator = app.router._itertokens(rule)  # bottle 0.12
+    for name, filter, conf in iterator:
+        if filter:
+            buf.write('(')
+            buf.write(name)
+            if (filter != app.router.default_filter and filter != 'default')\
+                    or conf:
+                buf.write(':')
+                buf.write(filter)
+            if conf:
+                buf.write(':')
+                buf.write(conf)
+            buf.write(')')
+        else:
+            buf.write(name)
+    return buf.getvalue()
+
+
+def get_routes(app):
+    for route in app.routes:
+        path = translate_bottle_rule(app, route.rule)
+        yield route.method, path, route
+
+
+class AutobottleDirective(Directive):
+
+    has_content = True
+    required_arguments = 1
+    option_spec = {'endpoints': directives.unchanged,
+                   'undoc-endpoints': directives.unchanged,
+                   'include-empty-docstring': directives.unchanged}
+
+    @property
+    def endpoints(self):
+        endpoints = self.options.get('endpoints', None)
+        if not endpoints:
+            return None
+        return frozenset(re.split(r'\s*,\s*', endpoints))
+
+    @property
+    def undoc_endpoints(self):
+        undoc_endpoints = self.options.get('undoc-endpoints', None)
+        if not undoc_endpoints:
+            return frozenset()
+        return frozenset(re.split(r'\s*,\s*', undoc_endpoints))
+
+    def make_rst(self):
+        app = import_object(self.arguments[0])
+        for method, path, target in get_routes(app):
+            endpoint = target.name or target.callback.__name__
+            if self.endpoints and endpoint not in self.endpoints:
+                continue
+            if endpoint in self.undoc_endpoints:
+                continue
+            view = target.callback
+            docstring = view.__doc__ or ''
+            if not isinstance(docstring, six.text_type):
+                analyzer = ModuleAnalyzer.for_module(view.__module__)
+                docstring = force_decode(docstring, analyzer.encoding)
+            if not docstring and 'include-empty-docstring' not in self.options:
+                continue
+            docstring = prepare_docstring(docstring)
+            for line in http_directive(method, path, docstring):
+                yield line
+
+    def run(self):
+        node = nodes.section()
+        node.document = self.state.document
+        result = ViewList()
+        for line in self.make_rst():
+            result.append(line, '<autobottle>')
+        nested_parse_with_titles(self.state, result, node)
+        return node.children
+
+
+def setup(app):
+    if 'http' not in app.domains:
+        httpdomain.setup(app)
+    app.add_directive('autobottle', AutobottleDirective)
+
diff --git a/doc/sphinx/_exts/httpdomain/autohttp/common.py 
b/doc/sphinx/_exts/httpdomain/autohttp/common.py
new file mode 100644
index 0000000..199e297
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/autohttp/common.py
@@ -0,0 +1,36 @@
+"""
+    sphinxcontrib.autohttp.common
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    The common functions for web framework reflection.
+
+    :copyright: Copyright 2011 by Hong Minhee
+    :license: BSD, see LICENSE for details.
+
+"""
+import six
+from six.moves import builtins
+from six.moves import reduce
+
+def import_object(import_name):
+    module_name, expr = import_name.split(':', 1)
+    mod = __import__(module_name)
+    mod = reduce(getattr, module_name.split('.')[1:], mod)
+    globals = builtins
+    if not isinstance(globals, dict):
+        globals = globals.__dict__
+    return eval(expr, globals, mod.__dict__)
+
+
+def http_directive(method, path, content):
+    method = method.lower().strip()
+    if isinstance(content, six.string_types):
+        content = content.splitlines()
+    yield ''
+    paths = [path] if isinstance(path, six.string_types) else path
+    for path in paths:
+        yield '.. http:{method}:: {path}'.format(**locals())
+    yield ''
+    for line in content:
+        yield '   ' + line
+    yield ''
diff --git a/doc/sphinx/_exts/httpdomain/autohttp/flask.py 
b/doc/sphinx/_exts/httpdomain/autohttp/flask.py
new file mode 100644
index 0000000..4bd5232
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/autohttp/flask.py
@@ -0,0 +1,48 @@
+"""
+    sphinxcontrib.autohttp.flask
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    The sphinx.ext.autodoc-style HTTP API reference builder (from Flask)
+    for sphinxcontrib.httpdomain.
+
+    :copyright: Copyright 2011 by Hong Minhee
+    :license: BSD, see LICENSE for details.
+
+"""
+from __future__ import absolute_import
+
+import re
+import itertools
+import six
+
+from docutils import nodes
+from docutils.parsers.rst import directives
+from docutils.statemachine import ViewList
+
+from sphinx.util import force_decode
+from sphinx.util.compat import Directive
+from sphinx.util.nodes import nested_parse_with_titles
+from sphinx.util.docstrings import prepare_docstring
+from sphinx.pycode import ModuleAnalyzer
+
+from sphinxcontrib import httpdomain
+from sphinxcontrib.autohttp.common import http_directive, import_object
+
+from .flask_base import AutoflaskBase
+
+class AutoflaskDirective(AutoflaskBase):
+
+    def run(self):
+        node = nodes.section()
+        node.document = self.state.document
+        result = ViewList()
+        for line in self.make_rst():
+            result.append(line, '<autoflask>')
+        nested_parse_with_titles(self.state, result, node)
+        return node.children
+
+
+def setup(app):
+    if 'http' not in app.domains:
+        httpdomain.setup(app)
+    app.add_directive('autoflask', AutoflaskDirective)
diff --git a/doc/sphinx/_exts/httpdomain/autohttp/flask_base.py 
b/doc/sphinx/_exts/httpdomain/autohttp/flask_base.py
new file mode 100644
index 0000000..50454fe
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/autohttp/flask_base.py
@@ -0,0 +1,215 @@
+"""
+    sphinxcontrib.autohttp.flask
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    The sphinx.ext.autodoc-style HTTP API reference builder (from Flask)
+    for sphinxcontrib.httpdomain.
+
+    :copyright: Copyright 2011 by Hong Minhee
+    :license: BSD, see LICENSE for details.
+
+"""
+
+import re
+import itertools
+import six
+
+from docutils import nodes
+from docutils.parsers.rst import directives
+from docutils.statemachine import ViewList
+
+from sphinx.util import force_decode
+from sphinx.util.compat import Directive
+from sphinx.util.nodes import nested_parse_with_titles
+from sphinx.util.docstrings import prepare_docstring
+from sphinx.pycode import ModuleAnalyzer
+
+from sphinxcontrib import httpdomain
+from sphinxcontrib.autohttp.common import http_directive, import_object
+
+
+def translate_werkzeug_rule(rule):
+    from werkzeug.routing import parse_rule
+    buf = six.StringIO()
+    for conv, arg, var in parse_rule(rule):
+        if conv:
+            buf.write('(')
+            if conv != 'default':
+                buf.write(conv)
+                buf.write(':')
+            buf.write(var)
+            buf.write(')')
+        else:
+            buf.write(var)
+    return buf.getvalue()
+
+
+def get_routes(app, endpoint=None, order=None):
+    endpoints = []
+    for rule in app.url_map.iter_rules(endpoint):
+        url_with_endpoint = (
+            six.text_type(next(app.url_map.iter_rules(rule.endpoint))),
+            rule.endpoint
+        )
+        if url_with_endpoint not in endpoints:
+            endpoints.append(url_with_endpoint)
+    if order == 'path':
+        endpoints.sort()
+    endpoints = [e for _, e in endpoints]
+    for endpoint in endpoints:
+        methodrules = {}
+        for rule in app.url_map.iter_rules(endpoint):
+            methods = rule.methods.difference(['OPTIONS', 'HEAD'])
+            path = translate_werkzeug_rule(rule.rule)
+            for method in methods:
+                if method in methodrules:
+                    methodrules[method].append(path)
+                else:
+                    methodrules[method] = [path]
+        for method, paths in methodrules.items():
+            yield method, paths, endpoint
+
+
+def quickref_directive(method, path, content):
+    rcomp = re.compile("^\s*.. :quickref:\s*(?P<quick>.*)$")
+    method = method.lower().strip()
+    if isinstance(content, six.string_types):
+         content = content.splitlines()
+    description=""
+    name=""
+    ref = 
path.replace("<","(").replace(">",")").replace("/","-").replace(":","-")
+    for line in content:
+         qref = rcomp.match(line)
+         if qref:
+            quickref = qref.group("quick")
+            parts = quickref.split(";",1)
+            if len(parts)>1:
+                name = parts[0]
+                description= parts[1]
+            else:
+                description= quickref
+            break
+
+    row ={}
+    row['name'] = name
+    row['operation'] = '      - `%s %s <#%s-%s>`_' % (method.upper(), path, 
method.lower(), ref)
+    row['description'] = description
+
+    return row
+
+class AutoflaskBase(Directive):
+
+    has_content = True
+    required_arguments = 1
+    option_spec = {'endpoints': directives.unchanged,
+                   'blueprints': directives.unchanged,
+                   'modules': directives.unchanged,
+                   'order': directives.unchanged,
+                   'undoc-endpoints': directives.unchanged,
+                   'undoc-blueprints': directives.unchanged,
+                   'undoc-modules': directives.unchanged,
+                   'undoc-static': directives.unchanged,
+                   'include-empty-docstring': directives.unchanged}
+
+    @property
+    def endpoints(self):
+        endpoints = self.options.get('endpoints', None)
+        if not endpoints:
+            return None
+        return re.split(r'\s*,\s*', endpoints)
+
+    @property
+    def undoc_endpoints(self):
+        undoc_endpoints = self.options.get('undoc-endpoints', None)
+        if not undoc_endpoints:
+            return frozenset()
+        return frozenset(re.split(r'\s*,\s*', undoc_endpoints))
+
+    @property
+    def blueprints(self):
+        blueprints = self.options.get('blueprints', None)
+        if not blueprints:
+            return None
+        return frozenset(re.split(r'\s*,\s*', blueprints))
+
+    @property
+    def undoc_blueprints(self):
+        undoc_blueprints = self.options.get('undoc-blueprints', None)
+        if not undoc_blueprints:
+            return frozenset()
+        return frozenset(re.split(r'\s*,\s*', undoc_blueprints))
+
+    @property
+    def modules(self):
+        modules = self.options.get('modules', None)
+        if not modules:
+            return frozenset()
+        return frozenset(re.split(r'\s*,\s*', modules))
+
+    @property
+    def undoc_modules(self):
+        undoc_modules = self.options.get('undoc-modules', None)
+        if not undoc_modules:
+            return frozenset()
+        return frozenset(re.split(r'\s*,\s*', undoc_modules))
+
+    @property
+    def order(self):
+        order = self.options.get('order', None)
+        if order not in (None, 'path'):
+            raise ValueError('Invalid value for :order:')
+        return order
+
+    def make_rst(self, qref=False):
+        app = import_object(self.arguments[0])
+        if self.endpoints:
+            routes = itertools.chain(*[get_routes(app, endpoint, self.order)
+                    for endpoint in self.endpoints])
+        else:
+            routes = get_routes(app, order=self.order)
+        for method, paths, endpoint in routes:
+            try:
+                blueprint, _, endpoint_internal = endpoint.rpartition('.')
+                if self.blueprints and blueprint not in self.blueprints:
+                    continue
+                if blueprint in self.undoc_blueprints:
+                    continue
+            except ValueError:
+                pass  # endpoint is not within a blueprint
+
+            if endpoint in self.undoc_endpoints:
+                continue
+            try:
+                static_url_path = app.static_url_path # Flask 0.7 or higher
+            except AttributeError:
+                static_url_path = app.static_path # Flask 0.6 or under
+            if ('undoc-static' in self.options and endpoint == 'static' and
+                static_url_path + '/(path:filename)' in paths):
+                continue
+            view = app.view_functions[endpoint]
+
+            if self.modules and view.__module__ not in self.modules:
+                continue
+
+            if self.undoc_modules and view.__module__ in self.modules:
+                continue
+
+            docstring = view.__doc__ or ''
+            if hasattr(view, 'view_class'):
+                meth_func = getattr(view.view_class, method.lower(), None)
+                if meth_func and meth_func.__doc__:
+                    docstring = meth_func.__doc__
+            if not isinstance(docstring, six.text_type):
+                analyzer = ModuleAnalyzer.for_module(view.__module__)
+                docstring = force_decode(docstring, analyzer.encoding)
+
+            if not docstring and 'include-empty-docstring' not in self.options:
+                continue
+            docstring = prepare_docstring(docstring)
+            if qref == True:
+                for path in paths:
+                    row = quickref_directive(method, path, docstring)
+                    yield row
+            else:
+                for line in http_directive(method, paths, docstring):
+                    yield line
diff --git a/doc/sphinx/_exts/httpdomain/autohttp/flaskqref.py 
b/doc/sphinx/_exts/httpdomain/autohttp/flaskqref.py
new file mode 100644
index 0000000..c28bb15
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/autohttp/flaskqref.py
@@ -0,0 +1,80 @@
+"""
+    sphinxcontrib.autohttp.flaskqref
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    The sphinx.ext.autodoc-style HTTP API quick reference 
+    builder (from Flask)
+    for sphinxcontrib.httpdomain.
+
+    :copyright: Copyright 2011 by Hong Minhee
+    :license: BSD, see LICENSE for details.
+
+"""
+
+from docutils import nodes
+from docutils.statemachine import ViewList
+
+from sphinxcontrib import httpdomain
+from sphinx.util.nodes import nested_parse_with_titles
+
+from .flask import AutoflaskBase
+
+
+class QuickReferenceFlaskDirective(AutoflaskBase):
+
+
+    header = [ '',
+              '.. list-table::',
+              '    :widths: 20 45 35',
+              '    :header-rows: 1',
+              '',
+              '    * - Resource',
+              '      - Operation',
+              '      - Description'
+            ]
+
+    def run(self):
+        node = nodes.section()
+        node.document = self.state.document
+        result = ViewList()
+        for line in QuickReferenceFlaskDirective.header:
+            result.append(line, '<qrefflask>') 
+        table={}
+        table_sorted_names=[]
+        
+        for table_row in self.make_rst(qref=True):
+            name = table_row['name']
+            if table.get(name) is None:
+                table[name]=[]
+            table[name].append(table_row) 
+            if name not in table_sorted_names:
+                table_sorted_names.append(name)
+
+        table_sorted_names.sort()
+
+        for name in table_sorted_names:
+            # Keep table display clean by not repeating duplicate
+            # resource names and descriptions
+            display_name = name
+            previous_description=None
+            for row in table[name]:
+                result.append('    * - %s' % display_name, '<qrefflask>')
+                display_name =""
+                result.append(row['operation'], '<qrefflask>')
+                description = row['description']
+                if previous_description is not None and previous_description 
== description:
+                    description =""
+                else:
+                    previous_description = description
+
+                result.append('      - %s' % description,  '<qrefflask>')
+
+        result.append('', '<qrefflask>')
+        nested_parse_with_titles(self.state, result, node)
+        return node.children
+        
+def setup(app):
+    if 'http' not in app.domains:
+        httpdomain.setup(app)
+    app.add_directive('qrefflask', QuickReferenceFlaskDirective)
+
diff --git a/doc/sphinx/_exts/httpdomain/autohttp/tornado.py 
b/doc/sphinx/_exts/httpdomain/autohttp/tornado.py
new file mode 100644
index 0000000..9a514fe
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/autohttp/tornado.py
@@ -0,0 +1,128 @@
+"""
+    sphinxcontrib.autohttp.tornado
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    The sphinx.ext.autodoc-style HTTP API reference builder (from Tornado)
+    for sphinxcontrib.httpdomain.
+
+    :copyright: Copyright 2013 by Rodrigo Machado
+    :license: BSD, see LICENSE for details.
+
+"""
+
+import inspect
+import re
+import six
+
+from docutils import nodes
+from docutils.parsers.rst import directives
+from docutils.statemachine import ViewList
+
+from sphinx.util import force_decode
+from sphinx.util.compat import Directive
+from sphinx.util.nodes import nested_parse_with_titles
+from sphinx.util.docstrings import prepare_docstring
+from sphinx.pycode import ModuleAnalyzer
+
+from sphinxcontrib import httpdomain
+from sphinxcontrib.autohttp.common import http_directive, import_object
+
+
+def translate_tornado_rule(app, rule):
+    buf = six.StringIO()
+    for name, filter, conf in app.router.parse_rule(rule):
+        if filter:
+            buf.write('(')
+            buf.write(name)
+            if filter != app.router.default_filter or conf:
+                buf.write(':')
+                buf.write(filter)
+            if conf:
+                buf.write(':')
+                buf.write(conf)
+            buf.write(')')
+        else:
+            buf.write(name)
+    return buf.getvalue()
+
+
+def get_routes(app):
+    for spec in app.handlers[0][1]:
+        handler = spec.handler_class
+        doc_methods = list(handler.SUPPORTED_METHODS)
+        if 'HEAD' in doc_methods:
+            doc_methods.remove('HEAD')
+        if 'OPTIONS' in doc_methods:
+            doc_methods.remove('OPTIONS')
+
+        for method in doc_methods:
+            maybe_method = getattr(handler, method.lower(), None)
+            if (inspect.isfunction(maybe_method) or
+                    inspect.ismethod(maybe_method)):
+                yield method.lower(), spec.regex.pattern, handler
+
+
+def normalize_path(path):
+    if path.endswith('$'):
+        path = path[:-1]
+    return path
+
+
+class AutoTornadoDirective(Directive):
+
+    has_content = True
+    required_arguments = 1
+    option_spec = {'endpoints': directives.unchanged,
+                   'undoc-endpoints': directives.unchanged,
+                   'include-empty-docstring': directives.unchanged}
+
+    @property
+    def endpoints(self):
+        endpoints = self.options.get('endpoints', None)
+        if not endpoints:
+            return None
+        return frozenset(re.split(r'\s*,\s*', endpoints))
+
+    @property
+    def undoc_endpoints(self):
+        undoc_endpoints = self.options.get('undoc-endpoints', None)
+        if not undoc_endpoints:
+            return frozenset()
+        return frozenset(re.split(r'\s*,\s*', undoc_endpoints))
+
+    def make_rst(self):
+        app = import_object(self.arguments[0])
+        for method, path, handler in get_routes(app):
+            class_name = handler.__name__
+            method_name = getattr(handler, method).__name__
+            endpoint = '.'.join((class_name, method_name))
+
+            if self.endpoints and endpoint not in self.endpoints:
+                continue
+            if endpoint in self.undoc_endpoints:
+                continue
+
+            docstring = getattr(handler, method).__doc__ or ''
+            #if not isinstance(docstring, unicode):
+            #    analyzer = ModuleAnalyzer.for_module(view.__module__)
+            #    docstring = force_decode(docstring, analyzer.encoding)
+            if not docstring and 'include-empty-docstring' not in self.options:
+                continue
+            docstring = prepare_docstring(docstring)
+            for line in http_directive(method, normalize_path(path), 
docstring):
+                yield line
+
+    def run(self):
+        node = nodes.section()
+        node.document = self.state.document
+        result = ViewList()
+        for line in self.make_rst():
+            result.append(line, '<autotornado>')
+        nested_parse_with_titles(self.state, result, node)
+        return node.children
+
+
+def setup(app):
+    if 'http' not in app.domains:
+        httpdomain.setup(app)
+    app.add_directive('autotornado', AutoTornadoDirective)
diff --git a/doc/sphinx/_exts/httpdomain/httpdomain.py 
b/doc/sphinx/_exts/httpdomain/httpdomain.py
new file mode 100644
index 0000000..59665a0
--- /dev/null
+++ b/doc/sphinx/_exts/httpdomain/httpdomain.py
@@ -0,0 +1,772 @@
+"""
+    sphinxcontrib.httpdomain
+    ~~~~~~~~~~~~~~~~~~~~~~~~
+
+    The HTTP domain for documenting RESTful HTTP APIs.
+
+    :copyright: Copyright 2011 by Hong Minhee
+    :license: BSD, see LICENSE for details.
+
+"""
+
+import re
+
+from docutils import nodes
+
+from pygments.lexer import RegexLexer, bygroups
+from pygments.lexers import get_lexer_by_name
+from pygments.token import Literal, Text, Operator, Keyword, Name, Number
+from pygments.util import ClassNotFound
+
+from sphinx import addnodes
+from sphinx.roles import XRefRole
+from sphinx.domains import Domain, ObjType, Index
+from sphinx.directives import ObjectDescription, directives
+from sphinx.util.nodes import make_refnode
+from sphinx.util.docfields import GroupedField, TypedField
+
+# The env.get_doctree() lookup results in a pickle.load() call which is
+# expensive enough to dominate the runtime entirely when the number of 
endpoints
+# and references is large enough. The doctrees are generated during the read-
+# phase and we can cache their lookup during the write-phase significantly
+# improving performance.
+# Currently sphinxcontrib-httpdomain does not declare to support parallel read
+# support (parallel_read_safe is the default False) so we can simply use a
+# module global to hold the cache.
+_doctree_cache = {}
+
+
+class DocRef(object):
+    """Represents a reference to an abstract specification."""
+
+    def __init__(self, base_url, anchor, section):
+        self.base_url = base_url
+        self.anchor = anchor
+        self.section = section
+
+    def __repr__(self):
+        """Returns the URL onto related specification section for the related
+        object."""
+        return '{0}#{1}{2}'.format(self.base_url, self.anchor, self.section)
+
+
+class RFC2616Ref(DocRef):
+    """Represents a reference to RFC2616.
+    In 2014, RFC2616 was replaced by multiple RFCs (7230-7237)."""
+
+    def __init__(self, section):
+        url = 'http://www.w3.org/Protocols/rfc2616/rfc2616-sec{0:d}.html'
+        url = url.format(int(section))
+        super(RFC2616Ref, self).__init__(url, 'sec', section)
+
+
+class IETFRef(DocRef):
+    """Represents a reference to the specific IETF RFC."""
+
+    def __init__(self, rfc, section):
+        url = 'https://tools.ietf.org/html/rfc{0:d}'.format(rfc)
+        super(IETFRef, self).__init__(url, 'section-', section)
+
+
+class EventSourceRef(DocRef):
+
+    def __init__(self, section):
+        url = 'http://www.w3.org/TR/eventsource/'
+        super(EventSourceRef, self).__init__(url, section, '')
+
+
+class CORSRef(DocRef):
+    """Represents a reference to W3 Cross-Origin Resource Sharing 
recommendation."""
+
+    def __init__(self, name, type):
+        url = 'http://www.w3.org/TR/cors/'
+        super(CORSRef, self).__init__(url, name, '-' + type)
+
+
+#: Mapping from lowercase HTTP method name to :class:`DocRef` object which
+#: maintains the URL which points to the section of the RFC which defines that
+#: HTTP method.
+METHOD_REFS = {
+    'patch': IETFRef(5789, 2),
+    'options': IETFRef(7231, '4.3.7'),
+    'get': IETFRef(7231, '4.3.1'),
+    'head': IETFRef(7231, '4.3.2'),
+    'post': IETFRef(7231, '4.3.3'),
+    'put': IETFRef(7231, '4.3.4'),
+    'delete': IETFRef(7231, '4.3.5'),
+    'trace': IETFRef(7231, '4.3.8'),
+    'connect': IETFRef(7231, '4.3.6'),
+    'copy': IETFRef(2518, 8.8),
+    'any': ''
+}
+
+
+#: Mapping from HTTP header name to :class:`DocRef` object which
+#: maintains the URL which points to the related section of the RFC.
+HEADER_REFS = {
+    'Accept': IETFRef(7231, '5.3.2'),
+    'Accept-Charset': IETFRef(7231, '5.3.3'),
+    'Accept-Encoding': IETFRef(7231, '5.3.4'),
+    'Accept-Language': IETFRef(7231, '5.3.5'),
+    'Accept-Ranges': IETFRef(7233, 2.3),
+    'Age': IETFRef(7234, 5.1),
+    'Allow': IETFRef(7231, '7.4.1'),
+    'Authorization': IETFRef(7235, 4.2),
+    'Cache-Control': IETFRef(7234, 5.2),
+    'Connection': IETFRef(7230, 6.1),
+    'Content-Encoding': IETFRef(7231, '3.1.2.2'),
+    'Content-Language': IETFRef(7231, '3.1.3.2'),
+    'Content-Length': IETFRef(7230, '3.3.2'),
+    'Content-Location': IETFRef(7231, '3.1.4.2'),
+    'Content-MD5': RFC2616Ref(14.15), # removed
+    'Content-Range': IETFRef(7233, 4.2),
+    'Content-Type': IETFRef(7231, '3.1.1.5'),
+    'Cookie': IETFRef(2109, '4.3.4'), # also RFC6265 section 5.4
+    'Date': IETFRef(7231, '7.1.1.2'),
+    'Destination': IETFRef(2518, 9.3),
+    'ETag': IETFRef(7232, 2.3),
+    'Expect': IETFRef(7231, '5.1.1'),
+    'Expires': IETFRef(7234, 5.3),
+    'From': IETFRef(7231, '5.5.2'),
+    'Host': IETFRef(7230, 5.4),
+    'If-Match': IETFRef(7232, 3.1),
+    'If-Modified-Since': IETFRef(7232, 3.3),
+    'If-None-Match': IETFRef(7232, 3.2),
+    'If-Range': IETFRef(7233, 3.2),
+    'If-Unmodified-Since': IETFRef(7232, 3.4),
+    'Last-Event-ID': EventSourceRef('last-event-id'),
+    'Last-Modified': IETFRef(7232, 2.2),
+    'Link': IETFRef(5988, '5'),
+    'Location': IETFRef(7231, '7.1.2'),
+    'Max-Forwards': IETFRef(7231, '5.1.2'),
+    'Pragma': IETFRef(7234, 5.4),
+    'Proxy-Authenticate': IETFRef(7235, 4.3),
+    'Proxy-Authorization': IETFRef(7235, 4.4),
+    'Range': IETFRef(7233, 3.1),
+    'Referer': IETFRef(7231, '5.5.2'),
+    'Retry-After': IETFRef(7231, '7.1.3'),
+    'Server': IETFRef(7231, '7.4.2'),
+    'Set-Cookie': IETFRef(2109, '4.2.2'),
+    'TE': IETFRef(7230, 4.3),
+    'Trailer': IETFRef(7230, 4.4),
+    'Transfer-Encoding': IETFRef(7230, '3.3.1'),
+    'Upgrade': IETFRef(7230, 6.7),
+    'User-Agent': IETFRef(7231, '5.5.3'),
+    'Vary': IETFRef(7231, '7.1.4'),
+    'Via': IETFRef(7230, '5.7.1'),
+    'Warning': IETFRef(7234, 5.5),
+    'WWW-Authenticate': IETFRef(7235, 4.1),
+    'Access-Control-Allow-Origin': CORSRef('access-control-allow-origin',
+                                           'response-header'),
+    'Access-Control-Allow-Credentials': 
CORSRef('access-control-allow-credentials',
+                                                'response-header'),
+    'Access-Control-Expose-Headers': CORSRef('access-control-expose-headers',
+                                             'response-header'),
+    'Access-Control-Max-Age': CORSRef('access-control-max-age',
+                                      'response-header'),
+    'Access-Control-Allow-Methods': CORSRef('access-control-allow-methods',
+                                            'response-header'),
+    'Access-Control-Allow-Headers': CORSRef('access-control-allow-headers',
+                                            'response-header'),
+    'Origin': CORSRef('origin', 'request-header'),
+    'Access-Control-Request-Method': CORSRef('access-control-request-method',
+                                             'response-header'),
+    'Access-Control-Request-Headers': CORSRef('access-control-request-headers',
+                                              'response-header'),
+}
+
+
+HTTP_STATUS_CODES = {
+    100: 'Continue',
+    101: 'Switching Protocols',
+    102: 'Processing',
+    200: 'OK',
+    201: 'Created',
+    202: 'Accepted',
+    203: 'Non Authoritative Information',
+    204: 'No Content',
+    205: 'Reset Content',
+    206: 'Partial Content',
+    207: 'Multi Status',
+    226: 'IM Used',              # see RFC 3229
+    300: 'Multiple Choices',
+    301: 'Moved Permanently',
+    302: 'Found',
+    303: 'See Other',
+    304: 'Not Modified',
+    305: 'Use Proxy',
+    307: 'Temporary Redirect',
+    308: 'Permanent Redirect',
+    400: 'Bad Request',
+    401: 'Unauthorized',
+    402: 'Payment Required',     # unused
+    403: 'Forbidden',
+    404: 'Not Found',
+    405: 'Method Not Allowed',
+    406: 'Not Acceptable',
+    407: 'Proxy Authentication Required',
+    408: 'Request Timeout',
+    409: 'Conflict',
+    410: 'Gone',
+    411: 'Length Required',
+    412: 'Precondition Failed',
+    413: 'Request Entity Too Large',
+    414: 'Request URI Too Long',
+    415: 'Unsupported Media Type',
+    416: 'Requested Range Not Satisfiable',
+    417: 'Expectation Failed',
+    418: "I'm a teapot",        # see RFC 2324
+    422: 'Unprocessable Entity',
+    423: 'Locked',
+    424: 'Failed Dependency',
+    426: 'Upgrade Required',
+    429: 'Too Many Requests',
+    449: 'Retry With',           # proprietary MS extension
+    451: 'Unavailable For Legal Reasons',
+    500: 'Internal Server Error',
+    501: 'Not Implemented',
+    502: 'Bad Gateway',
+    503: 'Service Unavailable',
+    504: 'Gateway Timeout',
+    505: 'HTTP Version Not Supported',
+    507: 'Insufficient Storage',
+    510: 'Not Extended'
+}
+
+WEBDAV_STATUS_CODES = [207, 422, 423, 424, 507]
+
+http_sig_param_re = re.compile(r'\((?:(?P<type>[^:)]+):)?(?P<name>[\w_]+)\)',
+                               re.VERBOSE)
+
+
+def sort_by_method(entries):
+    def cmp(item):
+        order = ['HEAD', 'GET', 'POST', 'PUT', 'DELETE', 'PATCH',
+                 'OPTIONS', 'TRACE', 'CONNECT', 'COPY', 'ANY']
+        method = item[0].split(' ', 1)[0]
+        if method in order:
+            return order.index(method)
+        return 100
+    return sorted(entries, key=cmp)
+
+
+def http_resource_anchor(method, path):
+    path = re.sub(r'[{}]', '', re.sub(r'[<>:/]', '-', path))
+    return method.lower() + '-' + path
+
+
+class HTTPResource(ObjectDescription):
+
+    doc_field_types = [
+        TypedField('parameter', label='Parameters',
+                   names=('param', 'parameter', 'arg', 'argument'),
+                   typerolename='obj', typenames=('paramtype', 'type')),
+        TypedField('jsonparameter', label='JSON Parameters',
+                   names=('jsonparameter', 'jsonparam', 'json'),
+                   typerolename='obj', typenames=('jsonparamtype', 
'jsontype')),
+        TypedField('requestjsonobject', label='Request JSON Object',
+                   names=('reqjsonobj', 'reqjson', '<jsonobj', '<json'),
+                   typerolename='obj', typenames=('reqjsonobj', '<jsonobj')),
+        TypedField('requestjsonarray', label='Request JSON Array of Objects',
+                   names=('reqjsonarr', '<jsonarr'),
+                   typerolename='obj',
+                   typenames=('reqjsonarrtype', '<jsonarrtype')),
+        TypedField('responsejsonobject', label='Response JSON Object',
+                   names=('resjsonobj', 'resjson', '>jsonobj', '>json'),
+                   typerolename='obj', typenames=('resjsonobj', '>jsonobj')),
+        TypedField('responsejsonarray', label='Response JSON Array of Objects',
+                   names=('resjsonarr', '>jsonarr'),
+                   typerolename='obj',
+                   typenames=('resjsonarrtype', '>jsonarrtype')),
+        TypedField('queryparameter', label='Query Parameters',
+                   names=('queryparameter', 'queryparam', 'qparam', 'query'),
+                   typerolename='obj',
+                   typenames=('queryparamtype', 'querytype', 'qtype')),
+        GroupedField('formparameter', label='Form Parameters',
+                     names=('formparameter', 'formparam', 'fparam', 'form')),
+        GroupedField('requestheader', label='Request Headers',
+                     rolename='header',
+                     names=('<header', 'reqheader', 'requestheader')),
+        GroupedField('responseheader', label='Response Headers',
+                     rolename='header',
+                     names=('>header', 'resheader', 'responseheader')),
+        GroupedField('statuscode', label='Status Codes',
+                     rolename='statuscode',
+                     names=('statuscode', 'status', 'code'))
+    ]
+
+    option_spec = {
+        'deprecated': directives.flag,
+        'noindex': directives.flag,
+        'synopsis': lambda x: x,
+    }
+
+    method = NotImplemented
+
+    def handle_signature(self, sig, signode):
+        method = self.method.upper() + ' '
+        signode += addnodes.desc_name(method, method)
+        offset = 0
+        path = None
+        for match in http_sig_param_re.finditer(sig):
+            path = sig[offset:match.start()]
+            signode += addnodes.desc_name(path, path)
+            params = addnodes.desc_parameterlist()
+            typ = match.group('type')
+            if typ:
+                typ += ': '
+                params += addnodes.desc_annotation(typ, typ)
+            name = match.group('name')
+            params += addnodes.desc_parameter(name, name)
+            signode += params
+            offset = match.end()
+        if offset < len(sig):
+            path = sig[offset:len(sig)]
+            signode += addnodes.desc_name(path, path)
+        assert path is not None, 'no matches for sig: %s' % sig
+        fullname = self.method.upper() + ' ' + path
+        signode['method'] = self.method
+        signode['path'] = sig
+        signode['fullname'] = fullname
+        return (fullname, self.method, sig)
+
+    def needs_arglist(self):
+        return False
+
+    def add_target_and_index(self, name_cls, sig, signode):
+        signode['ids'].append(http_resource_anchor(*name_cls[1:]))
+        if 'noindex' not in self.options:
+            self.env.domaindata['http'][self.method][sig] = (
+                self.env.docname,
+                self.options.get('synopsis', ''),
+                'deprecated' in self.options)
+
+    def get_index_text(self, modname, name):
+        return ''
+
+
+class HTTPOptions(HTTPResource):
+
+    method = 'options'
+
+
+class HTTPHead(HTTPResource):
+
+    method = 'head'
+
+
+class HTTPPatch(HTTPResource):
+
+    method = 'patch'
+
+
+class HTTPPost(HTTPResource):
+
+    method = 'post'
+
+
+class HTTPGet(HTTPResource):
+
+    method = 'get'
+
+
+class HTTPPut(HTTPResource):
+
+    method = 'put'
+
+
+class HTTPDelete(HTTPResource):
+
+    method = 'delete'
+
+
+class HTTPTrace(HTTPResource):
+
+    method = 'trace'
+
+
+class HTTPConnect(HTTPResource):
+
+    method = 'connect'
+
+
+class HTTPCopy(HTTPResource):
+
+    method = 'copy'
+
+
+class HTTPAny(HTTPResource):
+
+    method = 'any'
+
+
+class HTTPXRefRole(XRefRole):
+
+    def __init__(self, method, **kwargs):
+        XRefRole.__init__(self, **kwargs)
+        self.method = method
+
+    def process_link(self, env, refnode, has_explicit_title, title, target):
+        if not has_explicit_title:
+            title = self.method.upper() + ' ' + title
+        return title, target
+
+
+class HTTPXRefMethodRole(XRefRole):
+
+    def result_nodes(self, document, env, node, is_ref):
+        method = node[0][0].lower()
+        rawsource = node[0].rawsource
+        config = env.domains['http'].env.config
+        if method not in METHOD_REFS:
+            if not config['http_strict_mode']:
+                return [nodes.emphasis(method, method)], []
+            reporter = document.reporter
+            msg = reporter.error('%s is not valid HTTP method' % method,
+                                 line=node.line)
+            prb = nodes.problematic(method, method)
+            return [prb], [msg]
+        url = str(METHOD_REFS[method])
+        if not url:
+            return [nodes.emphasis(method, method)], []
+        node = nodes.reference(rawsource, method.upper(), refuri=url)
+        return [node], []
+
+
+class HTTPXRefStatusRole(XRefRole):
+
+    def result_nodes(self, document, env, node, is_ref):
+        def get_code_status(text):
+            if text.isdigit():
+                code = int(text)
+                return code, HTTP_STATUS_CODES.get(code)
+            else:
+                try:
+                    code, status = re.split(r'\s', text.strip(), 1)
+                    code = int(code)
+                except ValueError:
+                    return None, None
+                known_status = HTTP_STATUS_CODES.get(code)
+                if known_status is None:
+                    return code, None
+                elif known_status.lower() != status.lower():
+                    return code, None
+                else:
+                    return code, status
+
+        def report_unknown_code():
+            if not config['http_strict_mode']:
+                return [nodes.emphasis(text, text)], []
+            reporter = document.reporter
+            msg = reporter.error('%d is unknown HTTP status code' % code,
+                                 line=node.line)
+            prb = nodes.problematic(text, text)
+            return [prb], [msg]
+
+        def report_invalid_code():
+            if not config['http_strict_mode']:
+                return [nodes.emphasis(text, text)], []
+            reporter = document.reporter
+            msg = reporter.error(
+                'HTTP status code must be an integer (e.g. `200`) or '
+                'start with an integer (e.g. `200 OK`); %r is invalid' %
+                text,
+                line=node.line
+            )
+            prb = nodes.problematic(text, text)
+            return [prb], [msg]
+
+        text = node[0][0]
+        rawsource = node[0].rawsource
+        config = env.domains['http'].env.config
+
+        code, status = get_code_status(text)
+        if code is None:
+            return report_invalid_code()
+        elif status is None:
+            return report_unknown_code()
+        elif code == 226:
+            url = 'http://www.ietf.org/rfc/rfc3229.txt'
+        elif code == 418:
+            url = 'http://www.ietf.org/rfc/rfc2324.txt'
+        elif code == 429:
+            url = 'http://tools.ietf.org/html/rfc6585#section-4'
+        elif code == 449:
+            url = 
'http://msdn.microsoft.com/en-us/library/dd891478(v=prot.10).aspx'
+        elif code == 451:
+            url = 'http://www.ietf.org/rfc/rfc7725.txt'
+        elif code in WEBDAV_STATUS_CODES:
+            url = 'http://tools.ietf.org/html/rfc4918#section-11.%d' % 
(WEBDAV_STATUS_CODES.index(code) + 1)
+        elif code in HTTP_STATUS_CODES:
+            url = 'http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html' \
+                  '#sec10.' + ('%d.%d' % (code // 100, 1 + code % 100))
+        else:
+            url = ''
+        node = nodes.reference(rawsource, '%d %s' % (code, status), refuri=url)
+        return [node], []
+
+
+class HTTPXRefHeaderRole(XRefRole):
+
+    def result_nodes(self, document, env, node, is_ref):
+        header = node[0][0]
+        rawsource = node[0].rawsource
+        if header not in HEADER_REFS:
+            _header = '-'.join(map(lambda i: i.title(), header.split('-')))
+            if _header not in HEADER_REFS:
+                return [nodes.emphasis(header, header)], []
+        url = str(HEADER_REFS[header])
+        node = nodes.reference(rawsource, header, refuri=url)
+        return [node], []
+
+
+class HTTPIndex(Index):
+
+    name = 'routingtable'
+    localname = 'HTTP Routing Table'
+    shortname = 'routing table'
+
+    def __init__(self, *args, **kwargs):
+        super(HTTPIndex, self).__init__(*args, **kwargs)
+
+        self.ignore = [
+            [l for l in x.split('/') if l]
+            for x in self.domain.env.config['http_index_ignore_prefixes']]
+        self.ignore.sort(reverse=True)
+
+        # During HTML generation these values pick from class,
+        # not from instance so we have a little hack the system
+        cls = self.__class__
+        cls.shortname = self.domain.env.config['http_index_shortname']
+        cls.localname = self.domain.env.config['http_index_localname']
+
+    def grouping_prefix(self, path):
+        letters = [x for x in path.split('/') if x]
+        for prefix in self.ignore:
+            if letters[:len(prefix)] == prefix:
+                return '/' + '/'.join(letters[:len(prefix) + 1])
+        return '/%s' % (letters[0] if letters else '',)
+
+    def generate(self, docnames=None):
+        content = {}
+        items = ((method, path, info)
+                 for method, routes in self.domain.routes.items()
+                 for path, info in routes.items())
+        items = sorted(items, key=lambda item: item[1])
+        for method, path, info in items:
+            entries = content.setdefault(self.grouping_prefix(path), [])
+            entries.append([
+                method.upper() + ' ' + path, 0, info[0],
+                http_resource_anchor(method, path),
+                '', 'Deprecated' if info[2] else '', info[1]
+            ])
+        items = sorted(
+            (path, sort_by_method(entries))
+            for path, entries in content.items()
+        )
+        return (items, True)
+
+
+class HTTPDomain(Domain):
+    """HTTP domain."""
+
+    name = 'http'
+    label = 'HTTP'
+
+    object_types = {
+        'options': ObjType('options', 'options', 'obj'),
+        'head': ObjType('head', 'head', 'obj'),
+        'post': ObjType('post', 'post', 'obj'),
+        'get': ObjType('get', 'get', 'obj'),
+        'put': ObjType('put', 'put', 'obj'),
+        'patch': ObjType('patch', 'patch', 'obj'),
+        'delete': ObjType('delete', 'delete', 'obj'),
+        'trace': ObjType('trace', 'trace', 'obj'),
+        'connect': ObjType('connect', 'connect', 'obj'),
+        'copy': ObjType('copy', 'copy', 'obj'),
+        'any': ObjType('any', 'any', 'obj')
+    }
+
+    directives = {
+        'options': HTTPOptions,
+        'head': HTTPHead,
+        'post': HTTPPost,
+        'get': HTTPGet,
+        'put': HTTPPut,
+        'patch': HTTPPatch,
+        'delete': HTTPDelete,
+        'trace': HTTPTrace,
+        'connect': HTTPConnect,
+        'copy': HTTPCopy,
+        'any': HTTPAny
+    }
+
+    roles = {
+        'options': HTTPXRefRole('options'),
+        'head': HTTPXRefRole('head'),
+        'post': HTTPXRefRole('post'),
+        'get': HTTPXRefRole('get'),
+        'put': HTTPXRefRole('put'),
+        'patch': HTTPXRefRole('patch'),
+        'delete': HTTPXRefRole('delete'),
+        'trace': HTTPXRefRole('trace'),
+        'connect': HTTPXRefRole('connect'),
+        'copy': HTTPXRefRole('copy'),
+        'any': HTTPXRefRole('any'),
+        'statuscode': HTTPXRefStatusRole(),
+        'method': HTTPXRefMethodRole(),
+        'header': HTTPXRefHeaderRole()
+    }
+
+    initial_data = {
+        'options': {},  # path: (docname, synopsis)
+        'head': {},
+        'post': {},
+        'get': {},
+        'put': {},
+        'patch': {},
+        'delete': {},
+        'trace': {},
+        'connect': {},
+        'copy': {},
+        'any': {}
+    }
+
+    indices = []
+
+    @property
+    def routes(self):
+        return dict((key, self.data[key]) for key in self.object_types)
+
+    def clear_doc(self, docname):
+        for typ, routes in self.routes.items():
+            for path, info in list(routes.items()):
+                if info[0] == docname:
+                    del routes[path]
+
+    def resolve_xref(self, env, fromdocname, builder, typ, target,
+                     node, contnode):
+        try:
+            info = self.data[str(typ)][target]
+        except KeyError:
+            text = contnode.rawsource
+            role = self.roles.get(typ)
+            if role is None:
+                return None
+
+            if fromdocname not in _doctree_cache:
+                _doctree_cache[fromdocname] = env.get_doctree(fromdocname)
+            doctree = _doctree_cache[fromdocname]
+
+            resnode = role.result_nodes(doctree, env, node, None)[0][0]
+            if isinstance(resnode, addnodes.pending_xref):
+                text = node[0][0]
+                reporter = doctree.reporter
+                reporter.warning('Cannot resolve reference to %r' % text,
+                                 line=node.line)
+                return None
+            return resnode
+        else:
+            anchor = http_resource_anchor(typ, target)
+            title = typ.upper() + ' ' + target
+            return make_refnode(builder, fromdocname, info[0], anchor,
+                                contnode, title)
+
+    def resolve_any_xref(self, env, fromdocname, builder, target, node, 
contnode):
+        """Resolve the pending_xref *node* with the given *target*.
+
+        The reference comes from an "any" or similar role, which means that 
Sphinx
+        don't know the type.
+
+        For now sphinxcontrib-httpdomain doesn't resolve any xref nodes.
+
+        :return:
+           list of tuples ``('domain:role', newnode)``, where ``'domain:role'``
+           is the name of a role that could have created the same reference,
+        """
+        return []
+
+    def get_objects(self):
+        for method, routes in self.routes.items():
+            for path, info in routes.items():
+                anchor = http_resource_anchor(method, path)
+                yield (path, path, method, info[0], anchor, 1)
+
+
+class HTTPLexer(RegexLexer):
+    """Lexer for HTTP sessions."""
+
+    name = 'HTTP'
+    aliases = ['http']
+
+    flags = re.DOTALL
+
+    def header_callback(self, match):
+        if match.group(1).lower() == 'content-type':
+            content_type = match.group(5).strip()
+            if ';' in content_type:
+                content_type = content_type[:content_type.find(';')].strip()
+            self.content_type = content_type
+        yield match.start(1), Name.Attribute, match.group(1)
+        yield match.start(2), Text, match.group(2)
+        yield match.start(3), Operator, match.group(3)
+        yield match.start(4), Text, match.group(4)
+        yield match.start(5), Literal, match.group(5)
+        yield match.start(6), Text, match.group(6)
+
+    def continuous_header_callback(self, match):
+        yield match.start(1), Text, match.group(1)
+        yield match.start(2), Literal, match.group(2)
+        yield match.start(3), Text, match.group(3)
+
+    def content_callback(self, match):
+        content_type = getattr(self, 'content_type', None)
+        content = match.group()
+        offset = match.start()
+        if content_type:
+            from pygments.lexers import get_lexer_for_mimetype
+            try:
+                lexer = get_lexer_for_mimetype(content_type)
+            except ClassNotFound:
+                pass
+            else:
+                for idx, token, value in lexer.get_tokens_unprocessed(content):
+                    yield offset + idx, token, value
+                return
+        yield offset, Text, content
+
+    tokens = {
+        'root': [
+            (r'(GET|POST|PUT|PATCH|DELETE|HEAD|OPTIONS|TRACE|COPY)( +)([^ ]+)( 
+)'
+             r'(HTTPS?)(/)(1\.[01])(\r?\n|$)',
+             bygroups(Name.Function, Text, Name.Namespace, Text,
+                      Keyword.Reserved, Operator, Number, Text),
+             'headers'),
+            (r'(HTTPS?)(/)(1\.[01])( +)(\d{3})( +)([^\r\n]+)(\r?\n|$)',
+             bygroups(Keyword.Reserved, Operator, Number, Text, Number,
+                      Text, Name.Exception, Text),
+             'headers'),
+        ],
+        'headers': [
+            (r'([^\s:]+)( *)(:)( *)([^\r\n]+)(\r?\n|$)', header_callback),
+            (r'([\t ]+)([^\r\n]+)(\r?\n|$)', continuous_header_callback),
+            (r'\r?\n', Text, 'content')
+        ],
+        'content': [
+            (r'.+', content_callback)
+        ]
+    }
+
+
+def setup(app):
+    app.add_domain(HTTPDomain)
+
+    try:
+        get_lexer_by_name('http')
+    except ClassNotFound:
+        app.add_lexer('http', HTTPLexer())
+    app.add_config_value('http_index_ignore_prefixes', [], None)
+    app.add_config_value('http_index_shortname', 'routing table', True)
+    app.add_config_value('http_index_localname', 'HTTP Routing Table', True)
+    app.add_config_value('http_strict_mode', True, None)
+    app.add_config_value('http_headers_ignore_prefixes', ['X-'], None)
diff --git a/doc/sphinx/_exts/taler_sphinx_theme/__init__.py 
b/doc/sphinx/_exts/taler_sphinx_theme/__init__.py
new file mode 100644
index 0000000..2d3c61c
--- /dev/null
+++ b/doc/sphinx/_exts/taler_sphinx_theme/__init__.py
@@ -0,0 +1,166 @@
+"""Sphinx Guzzle theme."""
+
+import os
+from os import path
+import xml.etree.ElementTree as ET
+
+from docutils import nodes
+from sphinx.locale import admonitionlabels
+from sphinx.writers.html import HTMLTranslator as SphinxHTMLTranslator
+
+from pygments.style import Style
+from pygments.token import Keyword, Name, Comment, String, Error, \
+     Number, Operator, Generic, Whitespace, Punctuation, Other, Literal
+
+
+def setup(app):
+    """Setup conntects events to the sitemap builder"""
+    app.connect('html-page-context', add_html_link)
+    app.connect('build-finished', create_sitemap)
+    app.set_translator('html', MyHTMLTranslator)
+    app.set_translator('html-linked', MyHTMLTranslator)
+    app.sitemap_links = []
+    app.add_html_theme('taler_sphinx_theme', 
path.abspath(path.dirname(__file__) + "/guzzle_sphinx_theme"))
+
+
+def add_html_link(app, pagename, templatename, context, doctree):
+    """As each page is built, collect page names for the sitemap"""
+    base_url = app.config['html_theme_options'].get('base_url', '')
+    if base_url:
+        app.sitemap_links.append(base_url + pagename + ".html")
+
+
+def create_sitemap(app, exception):
+    """Generates the sitemap.xml from the collected HTML page links"""
+    if (not app.config['html_theme_options'].get('base_url', '') or
+           exception is not None or
+           not app.sitemap_links):
+        return
+
+    filename = app.outdir + "/sitemap.xml"
+    print("Generating sitemap.xml in %s" % filename)
+
+    root = ET.Element("urlset")
+    root.set("xmlns", "http://www.sitemaps.org/schemas/sitemap/0.9";)
+
+    for link in app.sitemap_links:
+        url = ET.SubElement(root, "url")
+        ET.SubElement(url, "loc").text = link
+
+    ET.ElementTree(root).write(filename)
+
+
+def html_theme_path():
+    return [os.path.dirname(os.path.abspath(__file__))]
+
+
+class MyHTMLTranslator(SphinxHTMLTranslator):
+    """
+    Handle translating to bootstrap structure.
+    """
+    def visit_table(self, node, name=''):
+        """
+        Override docutils default table formatter to not include a border
+        and to use Bootstrap CSS
+        See: 
http://sourceforge.net/p/docutils/code/HEAD/tree/trunk/docutils/docutils/writers/html4css1/__init__.py#l1550
+        """
+        self.context.append(self.compact_p)
+        self.compact_p = True
+        classes = 'table table-bordered ' + self.settings.table_style
+        classes = classes.strip()
+        self.body.append(
+            self.starttag(node, 'table', CLASS=classes))
+
+    def depart_table(self, node):
+        """
+        This needs overridin' too
+        """
+        self.compact_p = self.context.pop()
+        self.body.append('</table>\n')
+
+    def visit_field(self, node):
+        pass
+
+    def depart_field(self, node):
+        pass
+
+    def visit_field_name(self, node):
+        atts = {}
+        if self.in_docinfo:
+            atts['class'] = 'docinfo-name'
+        else:
+            atts['class'] = 'field-name'
+        self.context.append('')
+        self.body.append(self.starttag(node, 'dt', '', **atts))
+
+    def depart_field_name(self, node):
+        self.body.append('</dt>')
+        self.body.append(self.context.pop())
+
+    def visit_field_body(self, node):
+        self.body.append(self.starttag(node, 'dd', '', CLASS='field-body'))
+        self.set_class_on_child(node, 'first', 0)
+        field = node.parent
+        if (self.compact_field_list or
+            isinstance(field.parent, nodes.docinfo) or
+            field.parent.index(field) == len(field.parent) - 1):
+            # If we are in a compact list, the docinfo, or if this is
+            # the last field of the field list, do not add vertical
+            # space after last element.
+            self.set_class_on_child(node, 'last', -1)
+
+    def depart_field_body(self, node):
+        self.body.append('</dd>\n')
+
+    def visit_field_list(self, node):
+        self.context.append((self.compact_field_list, self.compact_p))
+        self.compact_p = None
+        if 'compact' in node['classes']:
+            self.compact_field_list = True
+        elif (self.settings.compact_field_lists
+              and 'open' not in node['classes']):
+            self.compact_field_list = True
+        if self.compact_field_list:
+            for field in node:
+                field_body = field[-1]
+                assert isinstance(field_body, nodes.field_body)
+                children = [n for n in field_body
+                            if not isinstance(n, nodes.Invisible)]
+                if not (len(children) == 0 or
+                        len(children) == 1 and
+                        isinstance(children[0],
+                                   (nodes.paragraph, nodes.line_block))):
+                    self.compact_field_list = False
+                    break
+        self.body.append(self.starttag(node, 'dl', frame='void',
+                                       rules='none',
+                                       CLASS='docutils field-list'))
+
+    def depart_field_list(self, node):
+        self.body.append('</dl>\n')
+        self.compact_field_list, self.compact_p = self.context.pop()
+
+    def visit_container(self, node):
+        self.body.append(self.starttag(node, 'div', CLASS='docutils'))
+
+    def add_secnumber(self, node):
+        # type: (nodes.Element) -> None
+        if node.get('secnumber'):
+            numbers = list(map(str, node['secnumber']))
+            if len(numbers) <= 3:
+                self.body.append('.'.join(numbers) + self.secnumber_suffix)
+        elif isinstance(node.parent, nodes.section):
+            if self.builder.name == 'singlehtml':
+                docname = self.docnames[-1]
+                anchorname = "%s/#%s" % (docname, node.parent['ids'][0])
+                if anchorname not in self.builder.secnumbers:
+                    anchorname = "%s/" % docname  # try first heading which 
has no anchor
+            else:
+                anchorname = '#' + node.parent['ids'][0]
+                if anchorname not in self.builder.secnumbers:
+                    anchorname = ''  # try first heading which has no anchor
+            if self.builder.secnumbers.get(anchorname):
+                numbers = list(self.builder.secnumbers[anchorname])
+                if len(numbers) <= 3:
+                    self.body.append('.'.join(map(str, numbers)) +
+                                     self.secnumber_suffix)
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diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/comments.html 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/comments.html
new file mode 100644
index 0000000..42a95fb
--- /dev/null
+++ b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/comments.html
@@ -0,0 +1,16 @@
+{% if theme_disqus_comments_shortname %}
+<div id="comments">
+  <div id="disqus_thread"></div>
+  <script type="text/javascript">
+    var disqus_shortname = '{{ theme_disqus_comments_shortname }}';
+    var disqus_identifier = '{{ pagename }}';
+    (function() {
+      var dsq = document.createElement('script'); dsq.type = 
'text/javascript'; dsq.async = true;
+      dsq.src = 'http://' + disqus_shortname + '.disqus.com/embed.js';
+      (document.getElementsByTagName('head')[0] || 
document.getElementsByTagName('body')[0]).appendChild(dsq);
+    })();
+  </script>
+  <noscript>Please enable JavaScript to view the <a 
href="http://disqus.com/?ref_noscript";>comments powered by 
Disqus.</a></noscript>
+  <a href="http://disqus.com"; class="dsq-brlink">comments powered by <span 
class="logo-disqus">Disqus</span></a>
+</div>
+{% endif %}
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/globaltoc.html 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/globaltoc.html
new file mode 100644
index 0000000..b2c04e2
--- /dev/null
+++ b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/globaltoc.html
@@ -0,0 +1,14 @@
+
+<div class="sidebar-block">
+  <div class="sidebar-wrapper">
+    <h2>{{ _('Table Of Contents') }}</h2>
+  </div>
+  <div class="sidebar-toc">
+    {% set toctree = toctree(maxdepth=theme_globaltoc_depth|toint, 
collapse=theme_globaltoc_collapse|tobool, 
includehidden=theme_globaltoc_includehidden|tobool) %}
+    {% if toctree %}
+      {{ toctree }}
+    {% else %}
+      {{ toc }}
+    {% endif %}
+  </div>
+</div>
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/layout.html 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/layout.html
new file mode 100644
index 0000000..18c9e5b
--- /dev/null
+++ b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/layout.html
@@ -0,0 +1,172 @@
+{%- extends "basic/layout.html" %}
+
+{# Do this so that bootstrap is included before the main css file #}
+{%- block htmltitle %}
+  <!-- Licensed under the Apache 2.0 License -->
+  <link rel="stylesheet" type="text/css" href="{{ 
pathto('_static/fonts/open-sans/stylesheet.css', 1) }}" />
+  <!-- Licensed under the SIL Open Font License -->
+  <link rel="stylesheet" type="text/css" href="{{ 
pathto('_static/fonts/source-serif-pro/source-serif-pro.css', 1) }}" />
+  <link rel="stylesheet" type="text/css" href="{{ 
pathto('_static/css/bootstrap.min.css', 1) }}" />
+  <link rel="stylesheet" type="text/css" href="{{ 
pathto('_static/css/bootstrap-theme.min.css', 1) }}" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  {{ super() }}
+{%- endblock %}
+
+{%- block extrahead %}
+  {% if theme_touch_icon %}
+  <link rel="apple-touch-icon" href="{{ pathto('_static/' ~ theme_touch_icon, 
1) }}" />
+  {% endif %}
+  {{ super() }}
+{% endblock %}
+
+{# Displays the URL for the homepage if it's set or the master_doc if it is 
not #}
+{% macro homepage() -%}
+  {%- if theme_homepage %}
+    {%- if hasdoc(theme_homepage) %}
+      {{ pathto(theme_homepage) }}
+    {%- else %}
+      {{ theme_homepage }}
+    {%- endif %}
+  {%- else %}
+    {{ pathto(master_doc) }}
+  {%- endif %}
+{%- endmacro %}
+
+{# Displays the URL for the tospage if it's set or falls back to homepage 
macro #}
+{% macro tospage() -%}
+  {%- if theme_tospage %}
+    {%- if hasdoc(theme_tospage) %}
+      {{ pathto(theme_tospage) }}
+    {%- else %}
+      {{ theme_tospage }}
+    {%- endif %}
+  {%- else %}
+    {{ homepage() }}
+  {%- endif %}
+{%- endmacro %}
+
+{# Displays the URL for the projectpage if it's set or falls back to homepage 
macro #}
+{% macro projectlink() -%}
+  {%- if theme_projectlink %}
+    {%- if hasdoc(theme_projectlink) %}
+      {{ pathto(theme_projectlink) }}
+    {%- else %}
+      {{ theme_projectlink }}
+    {%- endif %}
+  {%- else %}
+    {{ homepage() }}
+  {%- endif %}
+{%- endmacro %}
+
+{# Displays the next and previous links both before and after content #}
+{% macro render_relations() -%}
+  {% if prev or next %}
+  <div class="footer-relations">
+    {% if prev %}
+      <div class="pull-left">
+        <a class="btn btn-default" href="{{ prev.link|e }}" title="{{ 
_('previous chapter')}} (use the left arrow)">{{ prev.title }}</a>
+      </div>
+    {% endif %}
+    {%- if next and next.title != '&lt;no title&gt;' %}
+      <div class="pull-right">
+        <a class="btn btn-default" href="{{ next.link|e }}" title="{{ _('next 
chapter')}} (use the right arrow)">{{ next.title }}</a>
+      </div>
+    {%- endif %}
+    </div>
+    <div class="clearer"></div>
+  {% endif %}
+{%- endmacro %}
+
+{%- macro guzzle_sidebar() %}
+  <div id="left-column">
+    <div class="sphinxsidebar">
+      {%- if sidebars != None %}
+        {#- new style sidebar: explicitly include/exclude templates #}
+        {%- for sidebartemplate in sidebars %}
+        {%- include sidebartemplate %}
+        {%- endfor %}
+      {% else %}
+        {% include "logo-text.html" %}
+        {% include "globaltoc.html" %}
+        {% include "searchbox.html" %}
+      {%- endif %}
+    </div>
+  </div>
+{%- endmacro %}
+
+{%- block content %}
+
+  {%- if pagename == 'index' and theme_index_template %}
+    {% include theme_index_template %}
+  {%- else %}
+    <div class="container-wrapper">
+
+      <div id="mobile-toggle">
+        <a href="#"><span class="glyphicon glyphicon-align-justify" 
aria-hidden="true"></span></a>
+      </div>
+
+      {%- block sidebar1 %}{{ guzzle_sidebar() }}{% endblock %}
+
+      {%- block document_wrapper %}
+        {%- block document %}
+        <div id="right-column">
+          {% block breadcrumbs %}
+          <div role="navigation" aria-label="breadcrumbs navigation">
+            <ol class="breadcrumb">
+              <li><a href="{{ pathto(master_doc) }}">Docs</a></li>
+              {% for doc in parents %}
+                <li><a href="{{ doc.link|e }}">{{ doc.title }}</a></li>
+              {% endfor %}
+              <li>{{ title }}</li>
+            </ol>
+          </div>
+          {% endblock %}
+          <div class="document clearer body" role="main">
+            {% block body %} {% endblock %}
+          </div>
+          {%- block bottom_rel_links %}
+            {{ render_relations() }}
+          {%- endblock %}
+        </div>
+        <div class="clearfix"></div>
+        {%- endblock %}
+      {%- endblock %}
+
+      {%- block comments -%}
+        {% if theme_disqus_comments_shortname %}
+        <div class="container comment-container">
+          {% include "comments.html" %}
+        </div>
+        {% endif %}
+      {%- endblock %}
+    </div>
+  {%- endif %}
+  {%- endblock %}
+
+{%- block footer %}
+<script type="text/javascript">
+  $("#mobile-toggle a").click(function () {
+    $("#left-column").toggle();
+  });
+</script>
+<script type="text/javascript" src="{{ pathto('_static/js/bootstrap.js', 
1)}}"></script>
+{%- block footer_wrapper %}
+  <div class="footer">
+    &copy; Copyright {{ copyright }}. Created using <a 
href="http://sphinx.pocoo.org/";>Sphinx</a>.
+  </div>
+{%- endblock %}
+{%- block ga %}
+  {%- if theme_google_analytics_account %}
+    <script type="text/javascript">
+      var _gaq = _gaq || [];
+      _gaq.push(['_setAccount', '{{ theme_google_analytics_account }}']);
+      _gaq.push(['_trackPageview']);
+      (function() {
+        var ga = document.createElement('script'); ga.type = 
'text/javascript'; ga.async = true;
+        ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 
'http://www') + '.google-analytics.com/ga.js';
+        var s = document.getElementsByTagName('script')[0]; 
s.parentNode.insertBefore(ga, s);
+      })();
+    </script>
+  {%- endif %}
+{%- endblock %}
+{%- endblock %}
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/localtoc.html 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/localtoc.html
new file mode 100644
index 0000000..49f8e19
--- /dev/null
+++ b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/localtoc.html
@@ -0,0 +1,10 @@
+{%- if display_toc %}
+<div class="sidebar-block">
+  <div class="sidebar-wrapper">
+    <h2>{{ _('Contents') }}</h2>
+    <div class="sidebar-localtoc">
+      {{ toc }}
+    </div>
+  </div>
+</div>
+{%- endif %}
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/logo-text.html 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/logo-text.html
new file mode 100644
index 0000000..e52500e
--- /dev/null
+++ b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/logo-text.html
@@ -0,0 +1 @@
+<a href="{{ homepage() }}" class="text-logo">{{ theme_project_nav_name or 
shorttitle }}</a>
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/search.html 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/search.html
new file mode 100644
index 0000000..5d194d8
--- /dev/null
+++ b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/search.html
@@ -0,0 +1,48 @@
+{%- extends "basic/search.html" %}
+
+{% block body %}
+  <h1 id="search-documentation">{{ _('Search') }}</h1>
+  <div id="fallback" class="admonition warning">
+  <script type="text/javascript">$('#fallback').hide();</script>
+  <p>
+    {% trans %}Please activate JavaScript to enable the search
+    functionality.{% endtrans %}
+  </p>
+  </div>
+  <p>
+    {% trans %}From here you can search these documents. Enter your search
+    words into the box below and click "search". Note that the search
+    function will automatically search for all of the words. Pages
+    containing fewer words won't appear in the result list.{% endtrans %}
+  </p>
+
+  <div class="search-page-form">
+    <form class="form-inline" action="{{ pathto('search') }}" method="GET" 
role="form">
+      <div class="input-group">
+        <input name="q" type="text" class="form-control" />
+        <span class="input-group-btn">
+          <button class="btn btn-default" type="button">{{ _('search') 
}}</button>
+        </span>
+      </div>
+      <span id="search-progress" style="padding-left: 10px"></span>
+    </form>
+  </div>
+
+  {% if search_performed %}
+    <h2>{{ _('Search Results') }}</h2>
+    {% if not search_results %}
+      <p>{{ _('Your search did not match any documents. Please make sure that 
all words are spelled correctly and that you\'ve selected enough categories.') 
}}</p>
+    {% endif %}
+  {% endif %}
+  <div id="search-results">
+  {% if search_results %}
+    <ul>
+    {% for href, caption, context in search_results %}
+      <li><a href="{{ pathto(item.href) }}">{{ caption }}</a>
+        <div class="context">{{ context|e }}</div>
+      </li>
+    {% endfor %}
+    </ul>
+  {% endif %}
+  </div>
+{% endblock %}
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/searchbox.html 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/searchbox.html
new file mode 100644
index 0000000..7f574c3
--- /dev/null
+++ b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/searchbox.html
@@ -0,0 +1,15 @@
+{%- if pagename != "search" %}
+<div class="sidebar-block">
+  <div class="sidebar-wrapper">
+    <div id="main-search">
+      <form class="form-inline" action="{{ pathto('search') }}" method="GET" 
role="form">
+        <div class="input-group">
+          <input name="q" type="text" class="form-control" 
placeholder="Search...">
+        </div>
+        <input type="hidden" name="check_keywords" value="yes" />
+        <input type="hidden" name="area" value="default" />
+      </form>
+    </div>
+  </div>
+</div>
+{%- endif %}
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/css/bootstrap-theme.min.css
 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/css/bootstrap-theme.min.css
new file mode 100755
index 0000000..f05c90c
--- /dev/null
+++ 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/css/bootstrap-theme.min.css
@@ -0,0 +1,7 @@
+/*!
+ * Bootstrap v3.1.0 (http://getbootstrap.com)
+ * Copyright 2011-2014 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+.btn-default,.btn-primary,.btn-success,.btn-info,.btn-warning,.btn-danger{text-shadow:0
 -1px 0 rgba(0,0,0,0.2);-webkit-box-shadow:inset 0 1px 0 
rgba(255,255,255,0.15),0 1px 1px rgba(0,0,0,0.075);box-shadow:inset 0 1px 0 
rgba(255,255,255,0.15),0 1px 1px 
rgba(0,0,0,0.075)}.btn-default:active,.btn-primary:active,.btn-success:active,.btn-info:active,.btn-warning:active,.btn-danger:active,.btn-default.active,.btn-primary.active,.btn-success.active,.btn-info.active,.btn-warning.active,.btn-dan
 [...]
\ No newline at end of file
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/css/bootstrap.min.css
 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/css/bootstrap.min.css
new file mode 100755
index 0000000..e6dfb8b
--- /dev/null
+++ 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/css/bootstrap.min.css
@@ -0,0 +1,7 @@
+/*!
+ * Bootstrap v3.1.0 (http://getbootstrap.com)
+ * Copyright 2011-2014 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+/*! normalize.css v3.0.0 | MIT License | git.io/normalize 
*/html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0}article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block}audio,canvas,progress,video{display:inline-block;vertical-align:baseline}audio:not([controls]){display:none;height:0}[hidden],template{display:none}a{background:transparent}a:active,a:hover{outline:0}abbr[title]{border-bottom:1px
 dott [...]
\ No newline at end of file
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/fonts/glyphicons-halflings-regular.eot
 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/fonts/glyphicons-halflings-regular.eot
new file mode 100755
index 0000000..423bd5d
Binary files /dev/null and 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/fonts/glyphicons-halflings-regular.eot
 differ
diff --git 
a/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/fonts/glyphicons-halflings-regular.svg
 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/fonts/glyphicons-halflings-regular.svg
new file mode 100755
index 0000000..4469488
--- /dev/null
+++ 
b/doc/sphinx/_exts/taler_sphinx_theme/guzzle_sphinx_theme/static/fonts/glyphicons-halflings-regular.svg
@@ -0,0 +1,229 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" 
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"; >
+<svg xmlns="http://www.w3.org/2000/svg";>
+<metadata></metadata>
+<defs>
+<font id="glyphicons_halflingsregular" horiz-adv-x="1200" >
+<font-face units-per-em="1200" ascent="960" descent="-240" />
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