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[GNUnet-developers] Collecting data to demonstrate TCP ISN-based port kn

From: Christian Grothoff
Subject: [GNUnet-developers] Collecting data to demonstrate TCP ISN-based port knocking
Date: Thu, 15 May 2014 07:56:09 +0200
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Hi all,

We are trying to get a port-knocking extension into the Linux kernel,
which would be useful to obscure TCP services -- such as GNUnet or
Tor Bridges, and could use your help to collect data to help convince
the Linux people to adopt the latest patch.

As Knock uses two fields in the TCP header in order to hide information
and we explicitly want to be compatible with machines sitting in
typical home networks, we need to make sure that this information
doesn't get corrupted by the majority of NAT boxes out there. We thus
created a program which tests if Knock would work in your environment.
It would be great if some of you were able to execute the program on
your machines in order to help us to get an estimation of if Knock one
day could be used in a large scale.

You can find sources, binaries and a more elaborate description here:
Technical details about Knock and a (somewhat outdated) research paper
as well as kernel patches are provided here:

Please help, it should only take a minute to download & run the code.


Julian & Christian

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