OutGuess 0.2 review

OutGuess is a universal tool that allows the insertion of hidden information into the redundant bits of data sources. The program

License: GPL (GNU General Public License) File size: 459K Developer: Niels Provos

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OutGuess is a universal tool that allows the insertion of hidden information into the redundant bits of data sources.

The program relies on data specific handlers that will extract redundant bits and write them back after modification. In this version the PNM and JPEG image formats are supported. In the next paragraphs, images will be used as concrete example of data objects, though OutGuess can use any kind of data, as long as a handler is provided.

For JPEG images, OutGuess preserves statistics which are based on frequency counts. As a result, statistical tests based on frequency counts are unable 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.

What's New in This Release:
Use statistical corrections to defend against steganalysis.
A lot of cleanup.
Use all DCT coefficients for JPG now. This version is not any more compatible with the previous versions.