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中文摘要：
虽然传统的信誉机制可以有效激励P2P网络中的节点共享资源,但却带来女巫攻击和共谋攻击等安全问题,而现有的抵御这两种团体欺骗的方法往往没有考虑P2P网络的开放性,即鼓励节点的加入.本文从分析P2P信任网络（基于信任网络的P2P系统）的社团结构出发,根据节点之间的信任关系将网络划分成不同的信任团体,提出一种基于团体信任度的节点信誉机制.模拟实验结果表明：在不限制团体大小以及新节点加入的情况下,该机制可以有效地抵御开放P2P网络中的团体欺骗.
英文摘要：
Although Reputation mechanisms are useful to stimulate cooperation between peers in P2P networks,they bring some security problems such as group attacks. However,existing methods for solving these problems do not consider the openness character of P2P networks,which encourages peers to join the network. In this study,the reputation network-based P2P system （P2P reputation network） is divided into some different trust groups based on an analysis of group-structure. And a group-based reputation mechanism is also proposed. The simulation shows that this mechanism could defend against group attacks effectively without limiting the group size and new peers joining in open P2P reputation networks.
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