P2P网络信任模型及其在匿名线路节点选择中的应用

发布时间：2018-02-11 19:23

本文关键词： 信任模型 P2P网络 Tor网络社会心理学　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着P2P网络在文件分发、即时通讯和匿名通信等领域的广泛运用,随之而来的网络安全问题也受到了社会各界的关注,信任模型作为应对安全问题的重要机制广受关注。本文在现有的P2P网络信任模型的研究之上,研究了针对一般P2P网络的社会心理学信任模型和针对一类特殊P2P网络中的洋葱路由信任模型以及在线路节点选择中的应用问题。论文主要开展的研究如下:(1)介绍P2P网络的定义特点、拓扑结构、匿名特性和应用领域,简要概述信任的定义和特点,介绍信任模型的种类和关键技术,强调信任模型的评价指标,分析当前信任模型还存在的问题。(2)提出一种基于社会心理学的P2P网络信任模型。该模型借鉴社会心理学中接近性、熟悉性和相似性三个基本概念,引入成熟交易关系、信任学习因子、交易密度因子和相似度因子等新型要素进行直接信任和推荐信任的计算,并给出了模型信任值的计算方法和存储管理方式。最后从模型的动态适应性、容错性和优越性三方面信任模型进行仿真分析,相关结果表明了所提模型的有效性。(3)根据Tor工作原理,设计了 Tor网络洋葱路由节点OR的信任模型,该模型采用由OR节点主动声明构造的客观信任,和基于参与匿名通信的各方对线路中各节点转发性能评价构造的主观信任,通过加权集成为综合信任值。在此基础上设计了以综合信任值为依据的Tor线路节点选择方法,该方法在选择OR节点的过程中,综合考虑了节点的信任值情况以及物理地址回避原则。相关分析表明所提的模型和节点选择方法,可逼迫攻击者提高攻击成本,一定程度上实现了抑制作用。在论文的结尾,对前述研究内容进行总结,以期对未来研究提供借鉴并对值得进一步探索的问题进行研究展望。
[Abstract]:With the wide application of P2P network in the fields of file distribution, instant messaging and anonymous communication, the problems of network security have also been concerned by all walks of life. As an important mechanism to deal with security problems, trust model has attracted much attention. The social psychological trust model for general P2P networks and onion routing trust model for a class of special P2P networks and their application in line node selection are studied. The definition characteristics of P2P network, Topology, anonymity and application field, briefly summarize the definition and characteristics of trust, introduce the types and key technologies of trust model, and emphasize the evaluation index of trust model. This paper proposes a P2P network trust model based on social psychology, which draws lessons from the three basic concepts of proximity, familiarity and similarity in social psychology, and introduces mature transaction relations. The new factors, such as trust learning factor, transaction density factor and similarity factor, are used to calculate direct trust and recommendation trust, and the calculation method and storage management method of model trust value are given. Finally, the dynamic adaptability of the model is introduced. The simulation results show that the proposed model is effective. According to the working principle of Tor, the trust model of onion routing node OR in Tor network is designed. The model uses objective trust constructed by active declaration of OR nodes and subjective trust based on the evaluation of forwarding performance of each node in the line by the parties involved in anonymous communication. On the basis of weighted integration, a method of selecting Tor line nodes based on synthetic trust value is designed. The method is used to select OR nodes in the process of selecting OR nodes. Considering the trust value of the node and the principle of physical address avoidance, the correlation analysis shows that the proposed model and node selection method can force the attacker to increase the attack cost and achieve the inhibition effect to some extent. In order to provide reference for future research and research prospects for further exploration, the above research contents are summarized.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.08

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