Building a trust and reputation mechanism in P2P system is very important. This paper presented a trust model of choosing trusted source peers in P2P system based on the fuzzy relation theory in fuzzy mathematics. The authors defined four types of fuzzy trust relations, and gave the ways of fuzzy global trust relation matrix computing, which used as the base of judging which source peers were trusted peers. The simulation results showed this fuzzy relation trust model had good performance on choosing trusted source peers and filtering unfair recommendations.
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