一种改进的Crowds匿名通信协议

Improved Anonymous Communication Protocol Based on Crowds

Crowds匿名通信系统高效、实用,但存在两个不足之处:中间节点能够知道接收者身份信息且转发路径长度随机。针对上述不足之处,提出了一种改进的匿名通信协议。新协议在Crowds基础上增加了伪接收者和最长最短转发路径。报文中用伪接收者地址代替接收者地址以阻止中间节点获得接收者身份信息;用户设定报文转发路径长度最大最小值实现转发路径长度有界性和满足一定匿名需求。相关分析结果表明,在相同转发路径长度期望值下,新协议能有效增加用户匿名度。同时,对新协议进行了仿真验证。

The Crowds system is effective and practical, however there are two deficiencies: intermediate nodes can know receivers' identities and there is no upper bound for the route length. To address the deficiencies mentioned above, an improved anonymous communication protocol is proposed. The new protocol is based on Crowds, while it is added with more designs of Pseudo receiver and Max-Min route length. Pseudo receivers' addresses substitutes as receivers' in packets to prevent intermediate nodes getting receivers' identities; Users can decide max and min route length to limit the route length and meet the anonymity demand. By comparing the related data calculated under the same expected value for the route length, it is concluded that the new protocol effectively improves the degree of anonymity for users. At the same time, the new protocol is simulated and validated.