OutGuess is a universal steganographic tool that allows the insertion of hidden information into the redundant bits of data sources.
The nature of the data source is irrelevant to the core of outguess. The program relies on data specific handlers that will extract redundant bits and write them back after modification. Currently only the PPM (Portable Pixel Map), PNM (Portable Any Map), and JPEG image formats are supported, although outguess could use any kind of data, as long as a handler were provided.
For JPEG images, OutGuess preserves 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, the OutGuess system 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.
This is free and open source software.
Website: github.com/resurrecting-open-source-projects/outguess
Support:
Developer: Niels Provos and contributors
License: BSD-like License
OutGuess is written in C. Learn C with our recommended free books and free tutorials.
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