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|All Authors / Contributors:||
Teddy Furon; Pierre Duhamel; Ecole nationale supérieure des télécommunications (Paris),
|Description:||1 vol. (192 p.) ; 30 cm|
|Responsibility:||par Teddy furon ; sous la dir. de Pierre Duhamel.|
We consider in this thesis the use of digital watermarking in the copy protection framework for consumer electronics devices. We describe first the copy protection issue. Then, we build the global system with elementary securityparts such as encryption and digital signature. Yet, contrary to common approaches, the role of the watermark hasbeen reduced to the minimum: it is only a flag warning the devices that the content is protected. It is a kind ofsecond line of defence. Watermarking for copy protection is difficult due to two facts: the protected contents arewatermarked with the same key and the pirates have access to a watermark detector. Three kinds of attacks stemfrom these facts: the watermarked contents only attack, the original/watermarked contents attack and the chosenwatermarked contents attack. Even if we manage to reduced the capacity to one bit, the choice of a watermarkingtechnique is still difficult: an analysis shows that classical spread spectrum techniques do not provide a sufficientlyhigh level of security for this application. This is the reason why we invent a new class of methods known asasymmetric watermarking. This provides high security level but requires a bigger amount of data to detect thewatermark. To boost the detector, we take advantage of the side information at the embedding stage to optimisethe watermark detection. This gives birth to another new method so-called JANIS. For a small loss in the securitylevel, the detector is much more efficient. To conclude, these new methods may justify the Kerckhoffs principle in watermarking for copy protection.