Visual Information Processing and Protection Group

A Game-Theoretic Approach for New Techniques for Steganography and Steganalysis in the Pixel Domain

Giacomo Cancelli

The thesis takes into account steganography and steganalysis in the pixel domain. The contribution of this thesis is threefold.*From a steganalysis point of view we introduce a new steganalysis method called Amplitude of Local Extrema (ALE) which outperforms previously proposed pixel domain methods. As a second contribution we introduce a comparative methodology for the comparison of different steganalyzers and we apply it to compare ALE with the state-of-art steganalyzers. The third contribution of the thesis regards steganography, since we introduce a new embedding domain and a corresponding method, called MPSteg-color, which outperforms, in terms of undetectability, classical embedding methods as ±1 embedding.

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