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OutGuess - Just Solve the File Format Problem

OutGuess

From Just Solve the File Format Problem
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File Format
Name OutGuess
Ontology

OutGuess by Niels Provos is a steganography tool that hides information in PNM or JPEG files.

OutGuess has been tested on OpenBSD, Linux, Solaris and AIX.

OutGuess Rebirth is a portable Win32 version.

JOutguess Rebirth is a web version.

OutGuess preserves statistics 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.

OutGuess uses a generic iterator object to select which bits in the data should be modified. A seed can be used to modify the behavior of the iterator. It is embedded in the data along with the rest of the message. By altering the seed, OutGuess tries to find a sequence of bits that minimizes the number of changes in the data that have to be made.

Additionally, OutGuess allows to hide multiple messages (currently only 2) in the data. Thus, it also provides plausible deniablity. It keeps track of the bits that have been modified previously and locks them. A (23,12,7) Golay code is used for error correction to tolerate collisions on locked bits. Artificial errors are introduced to avoid modifying bits that have a hight bias.

After 0.13b was cracked, Niels Provos released 0.2 which isn't backwards compatible.

A fork called OutGuess Rebirth (OGR) was released in 2013 by Laurent Perch, with some bug fixes and a graphical user interface for Windows.

In November 2018, Debian developer Joao Eriberto Mota Filho imported the source code into a new repository on GitHub to continue development, and since then released some new minor versions that include bug fixes from several people


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