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DOI:
Journal of Software:2007.18(10):2551-2563

一种P2P电子商务系统中基于声誉的信任机制
姜守旭,李建中
(哈尔滨工业大学,计算机科学与技术学院,黑龙江,哈尔滨,150001)
A Reputation-Based Trust Mechanism for P2P E-Commerce Systems
JIANG Shou-Xu,LI Jian-Zhong
()
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Received:December 07, 2006    Revised:March 19, 2007
> 中文摘要: P2P电子商务系统中恶意节点的存在会破坏系统的正确性和可用性.基于声誉的信任机制通过计算节点的信任度可以识别出恶意节点.这种机制的可用性依赖于信任度的计算方法、信任机制的准确性及其抗攻击能力.然而,P2P环境下已有的信任机制在上述3个方面都存在着一些问题.这些问题的解决取决于影响信任度的信任因素的选取.因此,提出了一种新的P2P电子商务系统中基于声誉的信任机制.在该机制中,一个节点具有两种类型的声誉.一个节点相对于另一个节点的局部声誉是根据另一个节点对其交易行为的评价来计算的.一个节点的全局声誉是根据所有与其交易过的节点对它的评价来计算的.通过较全面地引入影响信任度的信任因素,既解决了局部声誉和全局声誉的精确计算问题,又提高了信任机制抗攻击的能力.为了确定节点所给评价的真实性,提出了一个节点评价的质量模型,并给出了节点评价的可信度计算方法.在计算信任度的过程中,利用置信因子来综合局部声誉和全局声誉,并给出置信因子的确定方法.最后,对信任机制的有效性和抗攻击能力进行了理论分析和实验验证.结果表明,提出的信任机制优于其他现有的方法,能够有效地应用于P2P电子商务系统中.
中文关键词: P2P系统  电子商务  信任机制  声誉  共谋
Abstract:The existence of malicious users could damage the correctness and availability of the peer-to-peer (P2P) e-commerce systems. Reputation-Based trust mechanisms can recognize these malicious peers by computing the trustworthiness of the peers. The validity of a reputation-based trust mechanism relies on some well-chosen trust factors,which directly influence the computation of trust value,the accuracy of the trust mechanism,and the resistibility of the trust mechanism to various attacks. However,there are some problems in the above three aspects of existing reputation-based trust mechanisms in P2P environments,such as the selection of trust factors. This paper presents a novel reputation-based trust mechanism for P2P e-commerce systems. In this mechanism,a peer has two kinds of reputations,namely local reputations and global reputations. The local reputation of a peer relative to another peer is calculated in terms of the reference peer’s rating of the transaction between the two peers,whereas the global reputation is computed based on all peers’ rating of the transaction between them. To compute the local and global reputations precisely and to obtain stronger resistibility to attacks as well,many comprehensive factors in computing trust value are introduced in the mechanism. To estimate the validity of the rating given by peers,a quality model and a computational method are also employed to evaluate the objectivity and the credibility of the rating,respectively. To compute the trust value of a peer,the concept of belief factor is introduced to integrate the local reputation with the global reputation. Furthermore,a method is put forward in this paper for determining belief factor. Finally,the effectiveness and resistibility of the proposed trust mechanism are analyzed theoretically and evaluated experimentally. The experimental results show that the proposed trust mechanism outperforms existing mechanisms,and can effectively be applied to the P2P e-commerce system.
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基金项目:Supported by the National Natural Science Foundation of China under Grant No.60473075 (国家自然科学基金); the Key Program of the National Natural Science Foundation of China under Grant No.60533110 (国家自然基金重点项目); the National Basic Research Program of China under Grant No.2006CB303000 (国家重点基础研究发展计划(973)); the Heilongjiang Province Fund for Young Scholars of China under Grant No.QC06C033 (黑龙江省青年科技专项资金) Supported by the National Natural Science Foundation of China under Grant No.60473075 (国家自然科学基金); the Key Program of the National Natural Science Foundation of China under Grant No.60533110 (国家自然基金重点项目); the National Basic Research Program of China under Grant No.2006CB303000 (国家重点基础研究发展计划(973)); the Heilongjiang Province Fund for Young Scholars of China under Grant No.QC06C033 (黑龙江省青年科技专项资金)
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姜守旭,李建中.一种P2P电子商务系统中基于声誉的信任机制.软件学报,2007,18(10):2551-2563

JIANG Shou-Xu,LI Jian-Zhong.A Reputation-Based Trust Mechanism for P2P E-Commerce Systems.Journal of Software,2007,18(10):2551-2563