ON THE SECURITY OF MESH-BASED MEDIA HASH-DEPENDENT WATERMARKING AGAINST PROTOCOL ATTACKS (WedPmOR6)

Author(s) : Chun-Shien Lu (Academia Sinica, Taiwan) Chia-Mu Yu (Academia Sinica, Taiwan)

Abstract : The protocol attacks containing copy attack and ambiguity attack can defeat watermarking methods at the protocol level. A popular way of resisting protocol attacks is to employ cryptographic techniques so that provable security can be retained. However, some desired requirements of watermarking such as blind detection and robustness against signal processing attacks are lost. The aim of this paper is to study the issue of security against protocol attacks based on a mesh-based media hash-dependent image watermarking approach while maintaining the aforementioned requirements. %The main contributions of our method include Our main contributions include (1) media hashing instead of cryptographic hashing is used so that blind detection still can be satisfied; (2) robustness against signal processing attacks is taken into consideration; (3) the difficulty of resisting ambiguity attack is derived to be equivalent to that of resisting challenging geometric attacks including cropping with larger parts discarded and rotation with larger degrees so that an acceptable trade-off between false positive and false negative can be achieved.

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