一种时域上的P2P信任模型  

Trust model in time-domain for P2P networks

作　　者：贾凡[1] 谢蒂[1] 杨义先[1] 

机构地区：[1]北京邮电大学信息安全中心,北京100876

出　　处：《计算机工程与应用》2007年第19期115-117,122,共4页Computer Engineering and Applications

基　　金：国家自然科学基金(the National Natural Science Foundation of China under Grant No.60372094)

摘　　要：传统的P2P信任是根据节点间交易成功和失败的次数来合成的,该值是个累积量,而实际的信任值是时变量。提出了一种新的P2P时域信任模型,对于局部信任,通过对每个时间段合成一个信任,然后根据时间段的新近赋予不同的加权合成局部信任;对于全局信任来说,随着时间的推移,发起节点会越来越重视自身对目标节点的信任评价,而其它节点的推荐值会得以削弱。该模型刻画了信任的动态性,能够有效地防止不良节点的信任短期积聚以及依靠其它节点共谋等恶意行为。In P2P networks,it is inevitable to interact between unknown peers for services provided.To reduce risk,it requires the trust evaluation prior to and posterior to interactions.A trust model in time domain is proposed in this paper to characterize the time procedure of reputation.To a peer,the local reputation evaluation should not be determined by the number of success and failure transactions,and the global reputation should pay more attention to itself evaluation as the count of transactions increased. This model can evaluate accurately and dynamically the trust of the given peer,and can prevent the collusion form the recommend peers.

关 键 词：P2P 局部信任度 全局信任度 时域 

分 类 号：TP393[自动化与计算机技术—计算机应用技术] TP309[自动化与计算机技术—计算机科学与技术]