Reputation-based P2P Network Security Model

Security has been a problem for computer network for a long time.P2P is a server-less distributed network model. All of the nodes in the P2P network are equal.P2P allow all computer connected equally, during the exchange of information no server is needed, which means information can be pass between two client directly. It has many advantages such as decentralized, scalability, robustness, privacy, high-performance and so on. Therefore, it has wide range of applications. However, due to its complex network environment and the huge number of nodes, P2P caused a serious network security risk.Traditional security mechanisms such as PKI, digital signatures need center Certification. However, nodes are equal each other in the P2P network, there is no central server. Therefore, traditional security mechanisms can't be use in P2P networks. Some of the existing security model such as Eigen Trust P2P model can not adapt to large-scale P2P network because of its efficiency.According to the P2P network security issues, a new P2P new security model based on regional trust was built in this paper. We study the behavioral characteristics of P2P network nodes and theories of human relations. Therefore, the new model fully reflects the characteristics of P2P nodes such as Autonomy, anonymity, preference and so on.The new model changes the way of reputation calculating. A trust path which can improve the efficiency of reputation calculation was built. At the same time, peers will be Punished or Encourage after the trading because of the feedback mechanism. So, the new model has a better performance on malicious peer issues. In addition, a trust queue which can improve the reliability of reputation and efficiency of calculation were built for each peer.Finally, we compare the efficiency and security Performance of the new model with Eigen Trust model in a simulation experiment. While the new model has high rate of transaction cancellation at the beginning, but it was more reliable. And its efficiency was also slightly higher than EigenTrust model. The new model had a better Performance on malicious nodes isolation.