1998-12-13 - steganography detection hazard?

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From: Anonymous <nobody@replay.com>
To: cypherpunks@toad.com
Message Hash: c550529ad4b9edb5e65fcf86922e3887c6b85c89f366167b2f8cd9b38f055625
Message ID: <199812132107.WAA14717@replay.com>
Reply To: N/A
UTC Datetime: 1998-12-13 21:06:03 UTC
Raw Date: Sun, 13 Dec 1998 13:06:03 -0800 (PST)

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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
Content-Length: 473
Lines: 35


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










  









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