【作者】 苏加军；

【导师】 王新梅；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2005， 硕士

【摘要】 随着数字技术和网络技术的飞速发展，各种形式的多媒体数字作品(图象、视频、音频等)纷纷在各种类型的网络中发布，其版权保护正成为一个需要迫切解决的问题。在诸如付费电视系统、在线数据库访问系统和CD在线发布系统等加密广播业务中，数据供应商DS(Data Supplier)经常面临两种典型的威胁：共谋密钥攻击和重放攻击。通常，这两种攻击中的攻击者被称为叛徒(叛逆者)。叛徒追踪方案就是DS为保护自己的合法权益(版权或机密信息)，用来追踪及识别叛徒的有效措施。 目前，对抗共谋密钥攻击的叛徒追踪方案主要有对称追踪方案、非对称追踪方案、门限追踪方案；而对抗重放攻击的叛徒追踪方案主要有动态追踪方案以及连续追踪方案等。本文从算法设计、密钥方案和算法性能等方面研究与分析上述叛徒追踪方案，主要的工作成果是： 1．详细介绍了对抗共谋密钥攻击的两类叛徒追踪方案：对称叛徒追踪方案和非对称叛徒追踪方案，并且深入的分析了它们各自的性能。 2．详细介绍了对抗非法重放攻击的两类叛徒追踪方案：动态叛徒追踪方案和连续叛徒追踪方案，并且深入的分析了它们各自的性能。 3．基于以上的工作，构造了一种新的动态叛徒追踪方案。该方案可以有效对抗即时重放攻击。通过引入一个均衡参数，该方案不仅可以动态的追踪所有的叛徒，而且可以动态的适应于不同用户容量的信息广播系统。更多还原

【Abstract】 With the rapid development of digital technology an network technology, all kinds of media data (video, music, or photos) are often distributed to subscribers by the networks, the copyright protection of which is becoming an important problem. In the encryption broadcast systems, such as pay TV system, on-line access to the database and CD distribution system, Data Suppliers often face two representative threats: collusion key attack and illegal rebroadcast attack, the attackers in which are usually called traitors. Traitor tracing schemes are efficient methods for Data Suppliers to protect their copyrights against the above attacks and identify the traitors.At present, there are three kinds of traitor tracing schemes against collusion key attack, which are symmetrical traitor tracing schemes and dissymmetrical traitor tracing schemes; and there are two kinds of traitor tracing schemes against illegal rebroadcast attack, which are dynamic traitor tracing schemes and sequential traitor tracing schemes. In this paper, we will research the tracing algorithm, key scheme and performance of the above traitor tracing schemes in depth. And the main results are as follows:1. Describing two kinds of traitor tracing schemes against collusion key attack in detail and analyzing their performance in depth.2. Describing two kinds of traitor tracing schemes against illegal rebroadcast attack in detail and analyzing their performance in depth.3. Based on the above work, constructing a new scheme of dynamic traitor tracing, which can combat with the immediate rebroadcast attack efficiently and be applicable to the broadcast systems with different sizes of subscriber set.更多还原