【作者】 丁一；

【导师】 范磊；

【作者基本信息】 上海交通大学 ， 通信与信息系统， 2011， 硕士

【摘要】 数字版权保护问题越来越受到人们的重视，传统数据分发系统容易受到的重播攻击：有些恶意的授权用户，会通过恶意泄露自己的授权密钥给其他非授权用户以得到私利，或者几个授权用户通过共谋制造出密钥给其他非授权用户使用。利用密码技术构造的广播加密叛逆者追踪方案从软件角度保护数字版权，它可以最终确定一个叛逆者的身份从而保护数字产品创造者及版权所有者的合法权益。现有的叛逆者追踪方案重点研究抗共谋、撤销性、追踪性、安全性等多个方面，但是缺少对用户隐私性保护的考虑。保护用户隐私和叛逆者追踪不矛盾。事实上，平衡数字内容价值链中普通合法用户隐私性和盗版者的可追踪性是数字版权保护机制中应该考虑的另一个重要方面。本文提出了可以保护合法用户隐私性的叛逆者追踪及撤销方案：在有效监管部门的帮助下，既可以快速有效的追踪到叛逆者，同时又保护了合法用户的隐私性。本文定义了两种具体实现方案，第一种基于盲签名构造的电子货币，其隐私性依赖于可信第三方。第二种方案基于匿名证书系统，减少了对可信第三方的依赖。文中最后给出了两种方案的基于离散对数问题的安全性证明。更多还原

【Abstract】 Content distribution systems are vulnerable to the attack ofrebroadcasting: pirate publishes the content or the decoding key inviolation of the licensing agreement. Sometimes several traitors colludetogether producing a separate decoding key and rebroadcast to the pirate.Broadcast encryption deals with methods to efficiently broadcastinformation to a dynamically changing group of users who are allowed toreceive the data. Tracing Mechanism enables the efficient tracing ofleakage, specifically, the source of keys used by illegal devices, such aspirate decoders or clones.We argue that privacy is another important feature in digital rightsmanagement technologies, and the proper balance between DRM and userprivacy is an important question in its own right. Our scheme adds thisimportant privacy-preserving feature into the existing content distributionsystem and with the help of a trusted third party it can efficiently trace andrevoke the pirate users while still preserves the privacy of honest users.This paper proposed two constructions. The first one is based on e-cash,which is constructed by blind signatures. It requires a trusted third party(TTP). The second construction is based on anonymous credential system,which does not rely on the TTP. Both of the constructions are based onDDH problem.更多还原