中文摘要：

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＆amp;Ptrust,其中资源和节点的信誉度是全局计算的。R＆amp;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＆amp;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。

英文摘要：

Content pollution is a serious problem in many popular Peer-to-Peer （P2P） file sharing systems. This paper proposes R＆amp;Ptrust, a new distributed and decentralized anti-pollution system based on resource and peer reputation, in which reputations of peers and resources are globally computed aiming at identifying polluted resources and isolating active polluters. The experiment results show that R＆amp;Ptrust could effectively reduce pollution dissemination.