文档介绍：II 摘要 P2P(Peer-to-Peer)网络,是近些年的主流网络结构。在P2P网络中,节点都是平等的, 节点既可以充当服务器的功能也可以充当客服端的功能。正是由于其节点的独有的特性, P2P网络在分布式计算、文件共享、电子商务等许多方面都有着极为广阔的应用前景。伴随着层出不穷的P2P软件的大量应用,P2P网络的安全问题也受到越来越多研究者的关注。 P2P网络节点的匿名性和自由性导致各种各样恶意的攻击的行为,这极大的影响了P2P技术的应用前景,也极大损害了客户的正常利益。为此,构建一个安全可靠的信任模型机制对于保障P2P网络安全显得十分必要。在对P2P网络技术进行了相关的介绍,包括P2P网络的研究发展状况和P2P网络的拓扑结构之后,将其与C/S模式做了一个简单的对比。之后阐述了P2P网络各种信任模型的相关的一些基础知识,讨论分析了各种模型在P2P网络中的适用性,并介绍了P2P网络环境下基于信誉的信任模型的设计思想。在EigenTrust模型的基础上,通过引入衰减调节函数、平均信誉值函数和异常评价监控函数,rust模型进行适当的补充和完善。最后通过模拟仿真实验将改进后的信任模型与EigenTrust模型进行对比,实验仿真结果表明, 在相同的初始值、受到相同的恶意节点攻击等情况下,改进的信任模型在节点的成功下载率都较之有所提高。关键词:P2P,信誉,信任模型,信任机制,评价 III Abstract Recently, P2P (Peer-to-Peer) network esthe work P2P network, the nodes isequal, the node can either act as the server-side functions and canalso serve as a customer service functions. Because of the unique features of its nodes, work hasa very broad application prospects, such as distributed computing network, file sharing, merce and many other aspects. With more and more P2P softwareapplied,P2P network security issuesisalso receivedmore and more the concern P2P network, anonymity and freedomof the nodes, led to the behavior of a variety of malicious attacks,which greatly affected the prospects of P2P technology, but also greatly damage the interests of the customer's deal with this problem, it is very necessaryto build a trust model for secure and reliable mechanism. First of all,this articleintroduces P2P network technology, including research and development status of P2P networks, and with the C/S mode to do a simple that, the paper describesthe trust model of P2P networks related to some basic knowledge of various models are discussed and analyzed the applicability of the work, and introduces the P2P network based on the credibility of the trust model of the design. On the basis of EigenTrust model,we