关键词: P2P网络, 聚类, 信任, 信誉, 双重度量

Abstract: In existing P2P trust models，the reputation values are always computed for behavior of peers.They can not deal with such particular case as that peers with high reputation value upload inauthentic resources.A new trust model is presented with double metric.The cluster method is introduced for designing the recommendation weight.The global reputation values of peers are gained by iteration.Associated with the reputation of peers and the credibility of resources，the methods of selecting peers for download are given.Simulation analyses show that，this model can alleviate the negative effect which is caused by peer’s malicious behavior more effective than parallel models.

Key words: P2P networks, cluster, trust, reputation, double metric