中文摘要：

目前重路由匿名通信系统有着广泛的应用，但也容易遭受各种攻击。基于重路由的匿名通信系统，如Onionl（outing，Hordes，Tarzan以及MorphMix等，采用重路由机制在应用层转发数据，使实体之间的通信以间接的方式进行，从而有效地隐藏通信实体的身份信息，如主机的IP地址等。在基于路径的重路由匿名通信系统的基础上，提出了前驱攻击模型，并对该模型进行了理论研究和分析，其结果表明，在设计重路由匿名通信系统时，为了降低前驱攻击的成功率，要同时考虑选择发起者的概率、转发概率和所构建路径数目。

英文摘要：

At present, rerouting anonymous communication system has an extensive application, but also suffers various attacks easily. Rerouting mechanism is adopted by rerouting-based anonymous communication systems such as Onion Routing, Hordes, Tarzan and MorphMix, to store and forward data in application layer. With this, users can communicate in an indirect way. Thus, identity information such as IP addresses can be effectively hidden against eavesdropper. Based on path rerouting anonymous communication system, predecessor attack model is proposed, and then the model of the predecessor attack is studied and analyzed. The results show that the probability of initiator selected, forward probability and the number of path constructed by initiator are to be considered when designing rerouting anonymous communication system in order to degrade success of attack.