The Research And Design Of Trust Model And Incentive Mechanism Of P2P Network Based On JXTA

On the basis of analyzing the distributing models at home and abroad and some security problems exiting in P2P, and combined with the social relation network in real world, this paper puts forward a new trust model named BGTR and an incentive machanism named SOIM designed based on BGTR. The model adopts a fully distributed method to the trust management, avoiding the dependence on the central server in central operation mode. Meanwhile the paper also introduces the uncertainty and dynamic fuzzy theory, and makes the model reacting to the reality better.This paper simulates and tests the designed model. Analysis to the test results indicates the following: when using trust model the system transaction success rate is obviously higher than that using model nothing; after using this trust model the system can be effectively separated from the malicious peers and restrains the combined attacks by malicious peers. The detailed research and implementation work in this paper includes as below:Research the architecture, conception and kernel protocols of JXTA platform, analyze the built-in security characters of JXTA platform, and build a completely secure application environment based on JAVA.Analyze the present P2P system models, give a detailed design to a fully distributed and un-structured P2P system model and lay the foundation for the peers, trust and incentive information in P2P network.Aim to resolve the security problems in P2P network, after analyzing the research state of trust model at home and abroad, give a new trust model BGTR based on uncertainty; adopt a distributed method to the trust management, avoiding the dependence on the central server in centralized mode.Design a trust passing methods based on recommendation; every peer has its recommendation trust relation table, and assigns every recommendatory peer a trust intensity, so as to enhance the credibility level for the source of recommending information. Based on analyzing the present incentive mechanisms, considering the similarity between the interest acquiring mode in Cournot's duopoly model and the contribution and gain benefit mode of peers in P2P network, introduce super optimizing theory in game playing theory to constitute a incentive mechanism.Design a P2P file sharing system, and implement the above trust model and incentive mechanism on the JXTA platform.Simulate and test the designed trust model and incentive mechanism for their validity, and analyze the test results.