Re: steganography

From: Ken Clements (
Date: Wed Oct 10 2001 - 12:26:31 MDT

Dear Friends,

My steganography test files are now ready. You can get them in a zip file at:

This will unzip into 8 audio clips from one of the Feynman lectures, each from
about 20 to 30 seconds long. All of the clips were recorded with the simple
Windows audio recorder app from a cassette player. Three of the clips are
untouched. The other five clips each contain a text message of about a page.

Two of the clips use a technique that takes the output of a pseudo random
generator to pick where to put bits from the message into the clip. The seed for
the generator is the key, but no attempt is made to hide the stats of the plain

Another two of the clips use a very big key generator to make bits that both pick
where to hide the text, and also encrypt that text so that its stats are gone.

One of the clips uses one time encryption from a thermal noise source (hopeless).

The purpose of this test is to see if anyone can tell which class the clips fall
into, and why.

Have fun! (I did)


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