关键词:  对等网络, 信誉体制, 客户证书, 信誉证书

Abstract: This paper presented a secure and efficient reputation system in P2P networks. It defined certificate CCert storing client information, and certificate RCert storing reputation information. Its mode of searching reputation was different from those existing modes, and ensured the efficiency and security of searching reputation. At the same time, it produced the last-time timestamp for the real-time characteristics of reputation information. Additionally, the system had other characters such as integrity of reputation information, non-repudiation, collusion-resisted and retaliation-resisted, which improved the usability of P2P networks.

Key words: peer-to-peer network, reputation system, CCert, RCert