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Re: A question on encryption

From: Marcin Borkowski
Subject: Re: A question on encryption
Date: Thu, 28 Aug 2014 08:30:59 +0200

Dnia 2014-08-28, o godz. 05:14:04
David Hume <address@hidden> napisaƂ(a):

> Marcin Borkowski <address@hidden> writes:
> > I created a test file (call it "test") with a single line of text
> > and did two things:
> >
> > 1. C-x C-f test RET, C-x C-w test.gpg RET
> >
> > Then I selected the key and hit ok.
> >
> > 2. From the command line:
> > gpg -e -r key-id -o test2.gpg test
> >
> > The two resulting files were different (difference in length of 3
> > bytes; find-file-literally and manual inspection showed that the
> > beginnings were identical, but the endings were not).
> >
> If you encrypt the same file twice, you don't get the same encrypted
> file. I think gpg will add random data to the end of the file. You
> could test that theory by encrypting the same file twice using your
> command line gpg. I am pretty sure I have done that in the past and
> observed that I did not get the same encryption twice.

Good point, that is true (which I've just checked experimentally) -
thanks for pointing that out!  But - the *size* remains the same
(well, it did 4 times, at least).  And with CLI gpg versus EPG, I also
get *consistently* differences in length (by a few bytes)!


Marcin Borkowski
Adam Mickiewicz University

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