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文件污染是当前P2P文件共享系统普遍存在的问题,极大地影响了系统的可用性。文中提出一种基于资源和节点的信誉度的反污染机制——R&Ptrust,其中资源和节点的信誉度是全局计算的。R&Ptrust还包括隔离主动污染者的惩罚机制和激励被动污染者删除污染文件的激励机制。仿真结果表明,R&Ptrust能有效的隔离污染者并遏制污染文件的传播,具有良好的反污染性能。
File pollution is a common problem in P2P file sharing system and greatly affects the availability of the system. In this paper, we propose an anti-pollution mechanism based on the reputation of resources and nodes - R & Ptrust, in which the credibility of resources and nodes is globally calculated. R & Ptrust also includes an incentive mechanism to isolate the penalties for proactive polluters and motivate passive polluters to delete contaminated documents. The simulation results show that R & Ptrust can effectively isolate polluters and prevent the spread of polluting documents and has good anti-pollution performance.