P2P网络中一种基于信任的访问控制模型

An Access Control Model Based on Trust in P2P Networks

对于P2P这样高度自主的分布式系统而言,安全性的提高应该依靠对节点相关机制和对文档相关机制的共同控制来实现.设计了存贮节点直接交互评价和对下载资源评价的数据结构,给出了过滤推荐节点的方法.在此基础上,提出了一种P2P文件系统信任模型及访问控制方案.通过计算节点的信任值和资源的信任值,并设置资源提供者信任阈值和共享文件信任阈值2种限制,保证选取安全可靠的下载源,从而实现安全访问策略.仿真实验结果表明,在P2P文件共享网络中,该模型能有效遏制恶意节点的不良行为,提高真实文件的下载成功率.

In self-organized and distributed peer to peer file-sharing systems,the security must depend on the improvement of peers＇ security and control mechanisms related to documents together.First,data structures are designed which are used stored both directly interaction evaluation and resource evaluation on the download,and the method of filtering recommendation peers is given.Moreover,on this basis,a trust model for P2P file systems with access control scheme is proposed.In the model,the peer＇s and source＇s trust value are calculated respectively,and two thresholds are set to limit source providers and shared files,with which the model can ensure safe and reliable download source is selected and achieve secure access strategy.Simulation results show that the model can effectively curb bad behaviors of malicious peers and increase the success download rate of authentic files in P2P file-sharing networks.