| P2P technology is widely used in file-sharing system, because of its inherent decentralized, autonomy, scalability, and fault tolerance, etc. However, the openness, anonymity, dynamic characteristics of P2P networks bring a lot of security issues. Users do not take responsibility for their own behavior, fraud and unreliable service exist in application,what make the quality of service can not be guaranteed. In addition, the existing trust model have universally the problem of single trust value calculation, ignore the problem of the different users having different needs, the same node providing services very different in various respects.This paper presents a multi-granularity trust model MF-Trust, and realizes file sharing system based on this. Model uses the idea based on sub-domains, each domain chooses the node as a super node that has the optimal performance and maximum trust value. Super node is responsible for the domain resource discovery, manage and supervise the behavior of other ordinary nodes, which facilitate the management of the network and make the system having better expansibility. Model calculates trust value of nodes by using multi-granularity to solve the problem different user concerned different field for the P2P services.,which make the nodes have more pertinence in interaction. Model gives corresponding punishment for fraud and sway behavior malicious node, injects malicious node in isolation, improves interactive success rate in P2P network.Based on MF-Trust model, This paper realizes file sharing system on the JXTA platform. The system is divided into three-tier architecture, realizes multi-granularity calculation methods in the service layer, for application layer users choose different nodes to download resource according to performance requirements. MF-Trust model rewards good and suppresses evil, guarantees the reliability of system in a certain extent, reaches the standard node behavior and improvement interactive success rate in P2P network. |
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