PGACS：一种基于P2P架构的分组匿名通信系统模型

PGACS： a P2P grouped anonymous communication system model

为使目前基于重路由机制的P2P匿名系统在用户增加时减少负载开销和管理开销,从而提高其可扩展性,提出了一种基于P2P架构的分组匿名通信系统模型--PGACS.系统中没有核心的管理节点,每个用户加入一定数量的逻辑组,并只保留其所在逻辑组成员的信息.给出了成员加入、退出的协议机制以及逻辑组的分裂合并机制,对系统的可扩展性和安全性进行了分析,同时基于前驱攻击对系统匿名性能进行了理论分析和模拟测试.结果表明,在合理选取逻辑组大小的前提下,系统能够提供与典型匿名系统Crowds相当的匿名性,同时具有良好的扩展性.

To reduce the current rerouting based P2P anonymous communication systems＇ overhead and management cost and to improve the scalability, this paper proposed a model of P2P grouped anonymous communication system-PGACS, which had no management centre. In the model, each user joins certain numbers of logic subgroups and only needs to keep the list of the members in these subgroups. The mechanism of members＇ joining and leaving and logical subgroups＇ splitting and merging were described in the paper. Also the analysis of system scalability and security was given. Based on the predecessor attack, a detailed mathematic analysis and simulation for the anonymity was presented. The results showed that PGACS could provide almost the same anonymity as the typical anonymous communication system Crowds and could scale well when the size of subgroup has been properly chosen.