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

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 sosta 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 stegosignal and the cover distance. It is measured by the KullbackLeibler distance.

• Type: Journal
• Year: 2008
• Where: CORR
• Authors: Sofiane Braci, Claude Delpha, Rémy Boyer, Gaëtan Le Guelvouit
• Keywords: Active Warden Context, CORR 2008, Costa Scheme, Education, Scalar Sosta Scheme