Research on Security Trust Model of P2P Network Based on Improved Search Algorithm

With the rapid development and popularization of the Internet, Peer-to-Peer (P2P) network technology has been developing rapidly, and the security trust mechanism of P2P network has become a prominent problem. This paper presents an improved node resource search algorithm. The algorithm improves the reliability of the system and the success rate of the search by setting the parameter value whether the node is trusted or not and the maximum value of the valid reply message received by the node. At the same time, in view of the shortcomings of the existing credibility calculation methods, an improved credibility update calculation method is proposed. This method can effectively prevent malicious nodes from attacking the trusted nodes and normal nodes and also prevent malicious nodes from improving the credibility of each node by means of small group cooperation.