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Développement de méthodes de tatouage sûres pour le traçage de contenus multimédia

Abstract : In this thesis, we first study the constraint of security in watermarking. In the WOA (Watermarked contents Only Attack) framework, an adversary owns several marked contents and try to estimate the secret key used for embedding in order to have access to the hidden messages. We present a new mean for spread-spectrum watermarking based on circular distributions in the private watermarking subspace. Thanks to this technique, we are able to minimise the distortion (on expectation) caused by the watermark in the WOA framework using the Hungarian optimisation method and the transportation theory. Then, we show that secure watermarking can be used in practical works with the example of still image watermarking. In the second part, we are interested about the problem of active fingerprinting which allows to trace re-distributors of illegal copies of a numerical content. The codes we use here are the ones proposed by Gabor Tardos. These codes are resistant against collusion attacks e.g. a group of malicious users who forges a new content by mixing their copies. Since watermarking techniques allow the embedding of these codes in numerical contents, a new worst case attack taking into account the security level of the watermarking system is proposed to reduce the accusation rate of the coalition. We show that secure watermarking is more efficient that insecure one (with similar robustness) for fingerprinting application. Finally, traitor tracing codes are implemented on video sequences by using spread-spectrum techniques in order to demonstrate that the accusation of adversaries is practically possible.
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Submitted on : Friday, February 10, 2012 - 2:45:22 AM
Last modification on : Friday, March 25, 2022 - 11:09:24 AM
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  • HAL Id : tel-00668566, version 1



Benjamin Mathon. Développement de méthodes de tatouage sûres pour le traçage de contenus multimédia. Traitement du signal et de l'image [eess.SP]. Institut National Polytechnique de Grenoble - INPG; Université Catholique de Louvain, 2011. Français. ⟨tel-00668566⟩



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