Based On The P2p Network Of "community" Equal Rights And Obligations Of Trust Mechanism And Simulation

P2P network showed its peculiar charm in file-sharing, content-distributing, distributing storage, distributing computation and so on. But its nature of opening, equity, autonomy, and free of supervision brings many security problems in. The absence of efficient incentive mechanisms leads to the phenomenon of"free-riding", meanwhile, lacking credibility records and no supervision cause the trust-losing between peers and bring about many evil network behaviors, for example, file-pollution, fraud sevices. All those lowered the network resources availability, provided convenience for virus and worms, damaged the security and the principle of mutual benefit, striked the honest peers'enthusiasm, eventully do harm to the sustainability, healthy of the network's grow.Focus on p2p soft security problem, based on the analysis of various trust mechanism and models, this paper proposed community-based rights and obligations reciprocity trust model, provided innovative protocols and mechanisms on the storage and acquire of credibility records, the computation and integration,management and application of confidence level, made it a distinguish distributed trust management mechanism.Based on the principle that the network behavior act as the indicator of actor's personal interests and professional habits, the proposed trust model divide the p2p network into independent communities without overlay and define the trust as inner community trust and outer community trust by peer's network behavior characteristic. Inside the community, peers contain credibility records of other peers and other communities respectively, and integrate this local records and feed-back records from other peers of the identical community to computate the trust level, then decide who the sevice source is and what sevice quality to provide by the trust level.the proposed RAOR trust model can improve peer's enthusiasm to provide good sevices and suppress virous kinds of evil behaviors, eventually to build a healthy and secure p2p system for peers. this is proved by simulation at the end of this paper.