From: Anonymous <nobody@replay.com>
Date: Sun, 13 Dec 1998 13:06:03 -0800 (PST)
To: cypherpunks@toad.com
Subject: steganography detection hazard?
Message-ID: <199812132107.WAA14717@replay.com>
MIME-Version: 1.0
Content-Type: text/plain
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Suppose you take your plaintext, encrypt it,
then spread the bits across an image as the LSBs.

The LSBs will, if you've used a decent cipher, 
have perfectly uniform distribution.

The 'noise' LSBs in a chunk of *digitized* bits will show
a *uniform* distribution.  (As indeed will the cipher's blocks,
or any bitchunk larger or smaller.)

Therefore an entropy test (see Maurer) will discriminate
between the two.

Please prove me wrong.

--Stegosaur