Wet paper codes and the dual distance in steganography

Details Wet paper codes and the dual distance in steganography Wet paper codes and the dual distance in steganography

2011-04-11

arxiv.org/abs/1104.1970v1

Computer Science

Cryptography and Security

Scientific paper

In 1998 Crandall introduced a method based on coding theory to secretly embed a message in a digital support such as an image. Later Fridrich et al. improved this method to minimize the distortion introduced by the embedding; a process called wet paper. However, as previously emphasized in the literature, this method can fail during the embedding step. Here we find sufficient and necessary conditions to guarantee a successful embedding by studying the dual distance of a linear code. Since these results are essentially of combinatorial nature, they can be generalized to systematic codes, a large family containing all linear codes. We also compute the exact number of solutions and point out the relationship between wet paper codes and orthogonal arrays.

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