【作者】 周亦鹏；

【导师】 段富；

【作者基本信息】 太原理工大学 ， 计算机软件， 2003， 硕士

【摘要】 本文应用密码学的理论和技术，针对消费者权利保护和拷贝追踪方面存在的问题进行研究，提出了一种基于半可信第三方的交互式数字水印协议(WPSTTP)。该协议规定，水印嵌入由交易双方协作完成，保证了对于买方的公平性和指纹水印的私有性。按照此协议，多媒体产品的购买者必须对所出现的该产品的任何非法拷贝负责；第三方只参与争议仲裁，交易阶段并不知晓双方的交易信息，仲裁阶段也不知晓多媒体内容中嵌入的指纹水印，达到了保护交易双方利益和隐私的目的。在协议实施的各个阶段均对信息进行了加密处理。理论分析表明，它能够满足水印信息安全性、协议公平性、指纹和实体的相关性以及指纹的私有性等条件。 在WPSTTP设计和安全性分析的基础上，本文对基于WPSTTP的多媒体交易系统进行了初步分析和设计，提出了实现WPSTTP的基本应用框架；针对加密安全性和交互次数这两个关键问题提出了解决方案并进行了实验验证。更多还原

【Abstract】 In this paper, we study the problems in customer’s right protection and copy tracing fields by applying the theories and techniques of modern cryptography, and present a watermarking protocol based on the semi-trusted third party (WPSTTP). In this protocol, the seller cooperates with the buyer in watermark embedding, so it’s fair to the buyer. And the protocol ensures the fingerprint watermark to be private. According to this protocol, the buyer has responsibility for any copy of the multimedia product he has bought; the third party only takes part in the dispute resolution, and he neither knows the information in transaction stage nor the watermark in dispute resolution phase. So the profits of the buyer and seller are protected. All the information at each stage of the protocol is encrypted. Security analysis is also made in this paper, which shows that the protocol meets the requirements of watermark security, fairness, correlation between fingerprint and the entity, private fingerprint, etc.According to the design and security analysis of WPSTTP,we also make the general analysis and designs of the multimedia transaction system based on WPSTTP, and give the basic implementation frame. At the same time, the experiment is done to test the encrypt-security solution. And a new solution to reduce the interactive times is also made.更多还原