____________________________________________________________________ Before a larger group can see the virtue of an idea, a smaller group must first understand it. "Stranger Suns" George Zebrowski The Armadillo Group ,::////;::-. James Choate Austin, Tx /:'///// ``::>/|/ ravage@ssz.com www.ssz.com .', |||| `/( e\ 512-451-7087 -====~~mm-'`-```-mm --'- -------------------------------------------------------------------- ---------- Forwarded message ---------- Date: Tue, 13 Feb 2001 18:01:59 -0500 From: Niels Provos <provos@citi.umich.edu> To: cryptography@c2.net Cc: coderpunks@toad.com Subject: [release] OutGuess 0.2 - universal steganography Release announcement of OutGuess 0.2 ------------------------------------ OutGuess is a universal steganographic tool that allows the insertion of hidden information into the redundant bits of data sources. It is undetectable by known statistical tests and provides for plausible deniability. You can download OutGuess from http://www.outguess.org/ Version 0.2 includes the following new features: - Undetectable by any statistical test based on frequency counts. - Determines maximum message size that can be hidden safely. - Increases message space for JPEG format. What does OutGuess do differently? OutGuess modifies the least-significant bits of the quantized DCT coefficients in case of the JPEG format. While some people view this as simple and primitive, it allows OutGuess to preserve statistics based on frequency counts. As a result, no known statistical test is able to detect the presence of steganographic content. Before embedding data into an image, OutGuess can determine the maximum message size that can be hidden while still being able to maintain statistics based on frequency counts. Regards, Niels Provos.