关键词: 匿名通信, 无环有限路长, 匿名性能

Abstract: Because rerouting routes of groups-based anonymous communication protocol allows the existence of ring，which will increase the appearance probability of sending proxy node on the rerouting routes and affect the anonymity of the system.In this paper，groups-based non-ring definite route length anonymous communication protocol has been proposed to prohibit the appearance of ring on the rerouting routes，restrict the length of the routes.Through theory analysis and simulate test data，it has been certified that the protocol can improve the anonymous performance of the system，reinforce information leakage resistance of the system，control the maximum length of the routes less than the number of the groups and realize receiver anonymity.

Key words: anonymous communication, non-ring definite route length, anonymous performance