The Research On Digital Watermark Protocol Base On The Diffie-Hellman Protocol

Digital watermarking is a new technology of information hiding and copyright protection in digital age.The robustness of digital productions relies increasingly on the modern digital watermarking technology.Many advance watermarking algorithms have been proposed.But in the age of the Internet,the effect of watermark technology is not merely dependent on traditional algorithms,but increasingly on a solid,standard,and efficient watermarking protocol.The watermarking algorithms must be integrated into the protocol so as to protect the copyright and hide the information.In recent years,a set of watermarking protocols with new mechanisms and algorithms have been proposed by researches all over the world.In this thesis,after introducing the basic concepts,research categories,usage model,construction and embedding technology of digital watermarking,we focus on the analysis of anonymous asymmetric digital watermarking protocols.Further,a new anonymous watermarking protocol has been proposed,which is based on the trusty third party.The main work is summarized in the following list:(1)We introduced the main framework of digital watermarking techniques,the attacking model and various watermarking algorithms.(2)We conclude the key questions of watermarking protocols and the architecture of watermarking protocols;we analysis the most common attack pattern for it;we conclude the basic design requirement of a robustness watermarking protocol;we give detail analysis to the function and effective of the third party in the watermarking protocol,which provide a sound foundation for the further work.(3)We proposed a new interactive buyer-seller watermarking protocol based on third trust party.By using new solutions of watermark embedding and encrypting,the new protocol can effectively prevent against the collusion attacking by buyer and the third party,the collusion attacking by seller and the third party,and the intermediate personate attacking.(4)We design a digital library system based on the previous digital watermarking protocol.It successfully simulates the main watermarking related operation,including the watermark generation,watermark insertion,the choice of digital content blocks and the watermark pattern detection and so on.