P2P文件共享系统中基于访问控制的信任模型  

Access Control Based Trust Model for P2P File Sharing Systems

作　　者：左翠华[1] 李瑞轩[1] 卢正鼎[1] 

机构地区：[1]华中科技大学计算机科学与技术学院,武汉430074

出　　处：《计算机科学》2008年第12期39-42,共4页Computer Science

基　　金：国家自然科学基金项目(60403027;60773191;70771043);国家高技术研究发展计划(863计划)项目(2007AA01Z403);中国博士后科学基金项目(20060400846);湖北省自然科学基金项目(2005ABA258);软件工程国家重点实验室开放基金项目(SKLSE05-07);华为科技基金项目(YBIN2006089)

摘　　要：在P2P文件共享系统中,节点之间共享彼此的文件。但是由于对等网络的匿名性和开放性,在文件共享系统中存在很多信任方面的问题,如恶意节点和自私节点的大量存在。为了孤立恶意节点和鼓励节点共享自己的文件,提出了基于访问控制的信任模型。首先,定义了一种信任机制,它引入了直接信任,推荐信任,时间衰减等因子。其次,对每个共享文件都加入了两个阈值——可信性总评价阈值和贡献量阈值来控制访问。对于每个请求者,只有当它有了对文件的访问资格后才能访问该文件。最后,通过大量的实验证明了本模型的可行性和高效性,特别是对恶意节点具有很好的孤立作用。In peer-to-peer （P2P） file sharing systems, the participating peers share the files with others. However, due to anonymity and openness, there are many trust and free-riding problems such as malicious peers and free-riders in P2P file sharing systems. Proposed a remedy for these problems by introducing access control to trust model for P2P file sharing systems. First,the paper defined a general trust metric which integrates the following parameters： direct trust between the requestor and the provider, recommendation from other peers and time declining factor. Moreover, each shared file has two threshold values to control access. One is the credibility threshold value and the other is the contri- bution threshold value. For each requesting peer, it can not access a file until it satisfies accessing qualification of the file. Finally,a set of experiments prove the feasibility and benefit of access control based trust model. Especially, this model can isolate malicious peer effectively.

关 键 词：对等网络 访问控制 信任模型 

分 类 号：TP393.409[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]