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文件污染是P2P文件共享系统面临的主要安全威胁之一,现有的文件污染防御机制包括基于反馈的声誉机制和基于用户行为的防御机制,前者面临用户合作度不高和反馈攻击等问题,后者不提供分级服务,无法激励用户过滤污染.本文提出一种激励用户主动过滤的文件污染防御机制,不需要依赖用户反馈.系统客户端自动跟踪下载节点过滤下载文件的行为,生成下载节点对服务节点的信任,该信任决定了下载节点将来获得服务的质量.仿真结果表明,本文机制能为好节点提供高效稳定的下载性能,同时惩罚自私节点和懒惰节点.这种分级服务能有效激励用户过滤污染文件.
File pollution is one of the major security threats facing P2P file sharing systems. Existing file pollution prevention mechanisms include reputation-based feedback mechanism and user-behavior-based defense mechanism. The former is faced with the problems of low user cooperation and feedback attacks. Does not provide hierarchical service, can not encourage users to filter pollution.This paper presents a mechanism to encourage users to actively filter the file pollution prevention mechanism, without relying on user feedback.And the system client automatically tracks the behavior of the downloaded node filtering the downloaded file, generate the download node to service Node trust, which determines the quality of the service that the download node will obtain in the future. The simulation results show that the proposed scheme can provide efficient and stable download performance for good nodes while punishing selfish nodes and lazy nodes. This hierarchical service can effectively stimulate user filtering Pollution documents.