基于信誉的p2p网络信任模型的分析.docx

南京邮电大学同等学力硕士研究生学位论文 中文摘要
中文摘要
P2P网络是近年来业界研究和关注的一个焦点,它在很多领域都得到了应用,未来发展的空间很大。但由于P2P网络的开放性和匿名性,各种恶意节点的恶意行为层出不穷,严重影响了网络的正常运行。因此,如何在P2P网络中识别出恶意节点,抑制和杜绝节点的恶意行为成为目前信任模型研究的一个热点。
在研究现有P2P网络信任模型的基础上,分析和信任有关的基本问题,讨论P2P信任模型有关的关键技术,提出一种新的基于信誉的P2P信任模型。
新模型对信任初始化、信任度计算、信任路径查询以及信任关系更新四个方面做了深入的研究。(1)模型加入了信任初始化过程(2)新模型改变了信任计算方式,综合考虑了直接信任、信誉,能更准确的评估节点的信任关系,引入了时间衰减因子的概念,更为高效的信任路径查找方式提高了信誉度的计算效率。(3)在信任关系的更新中引入奖惩机制更新节点间的信任关系,更好的解决了节点恶意行为带来的安全问题。此外,在交易结束对涉及信誉度计算的节点进行了反馈评估。
对改进的信任模型与EigenTrust信任模型用仿真实验进行了比较,结果表明,新模型具有较好的准确性、安全性和实用性。
关键词:信任模型,信誉,恶意节点,信任路径
南京邮电大学同等学力硕士研究生学位论文 ABSTRACT
ABSTRACT
Nowadays Peer-to—Peer(work has attracted more research and attentions,it has been applied in several fields and has great development in the tO the work's opening and anonymity,there are more and more misbehaviors of malicious peers,and the performance work is severely how to recognize those malicious peers,and how to restrain the
misbehaviors of dishonest peers have e more and more important in trust model.
After the study of existing work trust models,analysis of fundamental issues related to trust research and the discussion of the related key techniques of P2P trust model,a relatively new P2P trust model based on reputation is presented.
The improved trust model goes deep into the trust initialization、trust calculation、trust path search and trust updating.(1)The model addS the trust initialization process.(2)The new model changes the way oftrust bines direct trust、reputation to calculate overall trust value, so that it can calculate the trust relationships among peers more accurately,and introduces the concept of time decay trust path which can improve the efficiency of reputation calculation is built.(3)In the process of updating trust relationships,it USeS reward and punishment mechanism
to update trust relationships among peers and trust values of peers,this is a good solution to security
issues arising from nodes’malicious addition,peers in