Informed stego-systems in active warden context: statistical undetectability and capacity

Details Informed stego-systems in active warden context: statistical undetectability and capacity Informed stego-systems in active warden context: statistical undetectability and capacity

2008-11-28

arxiv.org/abs/0811.4697v1

Proc. IEEE Conf. on Multimedia Signal Processing, Cairns, Australia, Oct. 2008

Computer Science

Information Theory

6 pages, 8 figures

Scientific paper

10.1109/MMSP.2008.4665167

Several authors have studied stego-systems based on Costa scheme, but just a few ones gave both theoretical and experimental justifications of these schemes performance in an active warden context. We provide in this paper a steganographic and comparative study of three informed stego-systems in active warden context: scalar Costa scheme, trellis-coded quantization and spread transform scalar Costa scheme. By leading on analytical formulations and on experimental evaluations, we show the advantages and limits of each scheme in term of statistical undetectability and capacity in the case of active warden. Such as the undetectability is given by the distance between the stego-signal and the cover distance. It is measured by the Kullback-Leibler distance.

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