Digital Watermarking Facing Attacks by Amplitude Scaling and Additive White Noise
نویسندگان
چکیده
Digital watermarking is a technology which potentially can be used to enforce the copyrights and integrity of digital multimedia data. In this paper, a communications perspective on digital watermarking is used to compute upper performance limits on blind digital watermarking for simple AWGN attacks and attacks by amplitude scaling and additive white noise. We show that the latter case can be translated into effective AWGN attacks, which enables a straight forward capacity analysis based on the previously obtained watermark capacities for AWGN attacks. We analyze the watermark capacity for different theoretical and practical blind watermarking schemes. This analysis shows that the practical STSCS watermarking achieves at least 40 % of the capacity of an ideal blind watermarking scheme.
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