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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。
Crowds anonymous communication system is efficient and practical, but there are two shortcomings: the intermediate node can know the receiver’s identity information and the forwarding path length is random. In view of the above deficiencies, an improved anonymous communication protocol is proposed. The new protocol adds pseudo-receivers and longest and shortest forwarding paths to Crowds. In the packet, the address of the receiver is replaced by the address of the receiver to prevent the intermediate node from receiving the receiver’s identity information. The user sets the maximum and minimum length of the packet forwarding path to achieve the forwarding path length boundedness and satisfy certain anonymous requirements. The result of correlation analysis shows that under the expectation of the same forwarding path length, the new protocol can effectively increase user anonymity. Simultaneously, the new protocol is verified by simulation.