An asymmetric watermarking method

This paper presents an asymmetric watermarking method as an alternative to classical direct sequence spread spectrum and watermarking Costa (1983) schemes techniques. This new method provides a higher security level against malicious attacks threatening watermarking techniques used for a copy protection purpose. This application, which is quite different from the classical copyright enforcement issue, is extremely challenging as no public algorithm is yet known to be secure enough, and some proposed proprietary techniques have been already hacked. Our method is thus an attempt toward the proof that the Kerckhoff´s (1883) principle can be stated in the copy protection framework.