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 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.Comment: 6 pages, 8 figure

Etude des méthodes de dissimulation informées de données appliquées aux supports multimédias

Data hiding methods for multimedia securityEtude des methodes de dissimulation informees de donnees appliquees aux supports multimedia

Etude des méthodes de dissimulation informées de données appliquées aux supports multimédias

ORSAY-PARIS 11-BU Sciences (914712101) / SudocSudocFranceF

How quantization based schemes can be used in steganographic context

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Security evaluation of informed watermarking schemes

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On the tradeoff between security and robustness of the trellis coded quantization scheme

The steganographic security in the Cachin’s work is defined as the statistical invisibility between the host signal and its marked version. At contrary, the robustness to an attack is not a prime goal. In robust watermarking, this is exactly the inverse. The Scalar Costa Scheme (SCS) is a typical example of this fact. Indeed, this scheme is robust to Additive White Gaussian Noise (AWGN) attack but is drastically insecure since its probability density function for Gaussian host signal is severely discontinuous. An improved scheme has been proposed by Guillon et al. which increases the security to the detriment of the robustness. In this paper, we propose a new watermarking scheme, based on the combination of the Spread Transform (ST) and the Trellis Coded Quantization (TCQ) which is secure and robust to AWGN attack. Index Terms — Security, Robustness. 1

How quantization based schemes can be used in image steganographic context

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