Titlebook: Digital Watermarking; 6th International Wo Yun Q. Shi,Hyoung-Joong Kim,Stefan Katzenbeisser Conference proceedings 2008 Springer-Verlag Ber

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Attack Analysis for He & Wu’s Joint Watermarking/Fingerprinting SchemeHe-Wu fingerprinting system is considerably less secure against collusive attacks than suggested by the original paper. In addition to causing error rates above 85% at the decoder with as few as 8 colluders, one of our two attacks give copies with less distortion (measured by Euclidean distance) than the fingerprinted copies originally distributed.

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