The Game of Embedding and Detecting Spread Spectrum Watermarks under The Estimation Attack
نویسندگان
چکیده
Recently, we have demonstrated that simple block repetition codes enable strong robustness of spread-spectrum (SS) watermarks (WMs) with respect to limited geometric transformations [1]. Although such codes provide an effective prevention mechanism against WM de-synchronization, they also significantly increase the effectiveness of the watermark estimation attack [2]. We show the theory behind the interaction of parameters involved in the game of marking and detecting direct sequence SS WMs under the assumption that the WM estimation attack is carried out prior to WM detection. As an important contribution, we define a modification to the traditional SS WM detector that enforces the adversary to add amount of noise proportional in amplitude to the recorded signal in order to successfully remove a SS WM.
منابع مشابه
Embedding and Detecting Spread Spectrum Watermarks under The Estimation Attack
Spread-spectrum (SS) watermarking has been one of the oldest methodologies for hiding data in multimedia signals. Recently, it has been demonstrated that simple block repetition codes enable strong robustness of such watermarks with respect to noise addition and limited arbitrary geometric transformations. In order to further investigate the security of such watermarks, in this manuscript, we e...
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