Cryptography-Digest Digest #83, Volume #13 Fri, 3 Nov 00 10:13:01 EST
Contents:
Re: Detectable pattern in encoded stegaanographic images ([EMAIL PROTECTED])
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From: [EMAIL PROTECTED]
Subject: Re: Detectable pattern in encoded stegaanographic images
Date: Fri, 03 Nov 2000 14:31:24 GMT
In article <bhyM5.13648$[EMAIL PROTECTED]>,
"Peter Thorsteinson" <[EMAIL PROTECTED]>
>
> He didn't just say that he could detect a difference (duh). He said he
> "found a very clear pattern" that showed up when he compared them. I
guess
> the question is "what is the pattern". If it is indeed a pattern, then
> perhaps it could be leveraged to detect steganographic usage. That
would be
> cool, because the steganographic methods are only useful in cases
where
> their use are not being suspected.
>
in more detail of my posting from yesterday:
for comparison, here are the copied base 64 encodings:
because of the length, will need to post in to separate segments:
first, the unaltered bmp:
Content-Type: image/bmp;
name="Smooth Sandy Paper.bmp"
Content-Transfer-Encoding: base64
Content-ID: <001601c04290$b7f6c2e0$153d010a@r4q2u4>
Qk3IJwAAAAAAALYAAAAoAAAAZAAAAGQAAAABAAgAAAAAAAAAAAASCwAAEgsAACAAAAAgAAAA
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second post to follow,
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