Reaserch On The Trust Mechanism Based On P2P Network

P2P network is different from the traditional C/S or multi-server network entirely. P2P breaks the traditional client / server model that allows all network users to connect freely with each other, the communication is not dependent on the centralized server. Because P2P networks with this feature,It has led to the free-riding problem. In this paper, the main contents are:Firstly,This article introduces the characteristics of P2P network and structural research. It has introduced the trust model of the concepts and classifications and other key issues. The article studies the trust mechanism in P2P networks.Secondly, the paper proposes a trust model in P2P network based on PSO. The article finds some trust paths using PSO, and computes the path's trust value synthetically. The simulation results show that the trust model is more efficient than previous algorithms, more suitable for continuous space searching problems, and more useful to prevent the united fraud.Thirdly, the paper also proposed a trust model based on reputation. Based on the Bayesian formula, the paper considers the two aspects of trust (service quality and service speed). Looking for service provider, the paper not only takes into account its own trust, but also the system's trust. This paper presents the calculation of the trust, which effectively avoids the traditional method of calculating trust defects. Simulation results and analysis show that the model can assess the P2P system node trust. In an open network environment it has a good effect.Finally, the summary of the full text plans the future works.