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1.
对等网环境下一种安全有效的信誉体制   总被引:16,自引:1,他引:15  
提出一种基于公钥体制的安全有效的分布式信誉体制。定义了存储客户端信息的客户证书CCert和存储信誉信息的信誉证书RCert;采用与现有信誉查询方式不同的混和式查询,保证了信誉查询的有效性和安全性;同时生成最近时戳来保障信誉信息的实时性。此外,本体制还具有信誉信息的完整性、不可否认性、防合谋、防报复等特性,从而更好地提高对等网的可用性。  相似文献
2.
一种P2P电子商务系统中基于声誉的信任机制   总被引:13,自引:1,他引:12       下载免费PDF全文
姜守旭  李建中 《软件学报》2007,18(10):2551-2563
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.  相似文献
3.
Review on Computational Trust and Reputation Models   总被引:12,自引:0,他引:12  
The scientific research in the area of computational mechanisms for trust and reputation in virtual societies is a recent discipline oriented to increase the reliability and performance of electronic communities. Computer science has moved from the paradigm of isolated machines to the paradigm of networks and distributed computing. Likewise, artificial intelligence is quickly moving from the paradigm of isolated and non-situated intelligence to the paradigm of situated, social and collective intelligence. The new paradigm of the so called intelligent or autonomous agents and multi-agent systems (MAS) together with the spectacular emergence of the information society technologies (specially reflected by the popularization of electronic commerce) are responsible for the increasing interest on trust and reputation mechanisms applied to electronic societies. This review wants to offer a panoramic view on current computational trust and reputation models.  相似文献
4.
Web-Based Reputation Management Systems: Problems and Suggested Solutions   总被引:11,自引:0,他引:11  
Individuals who use the World Wide Web (WWW) to purchase goods and obtain information face a high level of uncertainty as to the quality of those goods and information. Reputation management systems are one way in which information about past transactions can be used to form judgments regarding the quality of goods and information obtained via the WWW. This paper examines current approaches used in reputation management systems and outlines six main problems with them. The paper suggests how these problems can be solved and develops an equation that can handle many of the problems. Implications for practitioners and researchers are discussed.  相似文献
5.
Distributed Reputation Management for Electronic Commerce   总被引:10,自引:0,他引:10  
One of the major challenges for electronic commerce is how to establish a relationship of trust between different parties. Establishing trust is nontrivial, because the traditional physical or social means of trust cannot apply directly in virtual settings. In many cases, the parties involved may not ever have interacted before. Reputation systems seek to address the development of trust by recording the reputations of different parties. However, most existing reputation systems are restricted to individual market websites. Further, relevant information about a party may come from several websites and from interactions that were not mediated by any website.
This paper considers the problem of automatically collecting ratings about a given party from others. Our approach involves a distributed agent architecture and adapts the mathematical theory of evidence to represent and propagate the ratings that participants give to each other. When evaluating the trustworthiness of a given party, a peer combines its local evidence (based on direct prior interactions with the party) with the testimonies of others regarding the same party. This approach satisfies certain important properties of distributed reputation management and is experimentally evaluated through simulations.  相似文献
6.
An integrated trust and reputation model for open multi-agent systems   总被引:10,自引:0,他引:10  
Trust and reputation are central to effective interactions in open multi-agent systems (MAS) in which agents, that are owned by a variety of stakeholders, continuously enter and leave the system. This openness means existing trust and reputation models cannot readily be used since their performance suffers when there are various (unforseen) changes in the environment. To this end, this paper presents FIRE, a trust and reputation model that integrates a number of information sources to produce a comprehensive assessment of an agent’s likely performance in open systems. Specifically, FIRE incorporates interaction trust, role-based trust, witness reputation, and certified reputation to provide trust metrics in most circumstances. FIRE is empirically evaluated and is shown to help agents gain better utility (by effectively selecting appropriate interaction partners) than our benchmarks in a variety of agent populations. It is also shown that FIRE is able to effectively respond to changes that occur in an agent’s environment.  相似文献
7.
无线传感器网络中的信任管理   总被引:10,自引:0,他引:10       下载免费PDF全文
荆 琦  唐礼勇  陈 钟 《软件学报》2008,19(7):1716-1730
作为对基于密码体系的安全手段的重要补充,信任管理在解决WSNSs(wireless sensor networks)中的内部攻击,识别恶意节点、自私节点及低竞争力节点,提高系统安全性、可靠性和公平性等方面有着显著优势.综述了WSNs环境下信任管理的特点、分类方法、框架设计、脆弱性分析、攻击模型及对策,在此基础上介绍了WSNs下的典型信任管理系统.以信任计算模型为中心的WSNs环境下信任管理框架的设计是信任管理系统的核心,从信任要素、信任计算模型和信任值的应用这3个方面对其进行了深入讨论.最后,总结了WSNs环境下信任管理的研究现状,提出了值得参考的研究发展方向.  相似文献
8.
一种直接评价节点诚信度的分布式信任机制   总被引:9,自引:1,他引:8       下载免费PDF全文
彭冬生  林 闯  刘卫东 《软件学报》2008,19(4):946-955
基于信誉的信任机制能够有效解决P2P网络中病毒泛滥和欺诈行为等问题.现有信任机制大多采用单个信誉值描述节点的诚信度,不能防止恶意节点用诚信买行为掩盖恶意卖行为;而且从信誉值上无法区分初始节点和恶意节点.提出一种新的分布式信任机制,基于交易历史,通过迭代求解,为每个节点计算全局买信誉值和卖信誉值,根据信誉值便能判断节点的善恶.仿真实验对比和性能分析表明,与EigenTrust算法相比,该算法能够迅速降低恶意节点的全局信誉值,抑制合谋攻击,降低恶意交易概率.  相似文献
9.
在线信誉系统中的信任模型构建研究   总被引:8,自引:0,他引:8  
朱艳春  刘鲁  张巍 《控制与决策》2007,22(4):413-417,422
针对现有在线信誉系统中信任模型的缺陷,基于在线拍卖的特点,并结合已有信任研究成果,构建了基于多影响因素的信任模型.本模型适用于在线拍卖环境下对用户信誉状况的全面、准确的评估.仿真实验表明,与现有信任模型相比,本模型的信任度计算精确度较高,具有较好的可行性.  相似文献
10.
C2C网上拍卖中的信任计算模型研究   总被引:8,自引:0,他引:8  
针对拍卖网站中现有的信任计算方法的不足以及传统理论信任模型的局限性,论文提出了影响网上拍卖信任的5项信任因素,并构建了C2C网上拍卖中的信任计算模型。最后仿真实验的结果表明模型具有较好的有效性和可行性。  相似文献
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