【作者】 王宏林；

【导师】 朱艳琴；

【作者基本信息】 苏州大学 ， 计算机应用技术， 2008， 硕士

【摘要】 P2P作为当前Internet上最有潜力的技术之一,已受到越来越多的关注。由于P2P网络是动态的、开放性的网络,须具有有效机制来提高网络的安全性,现普遍借助于人际网络的信任机制来建立节点的信任关系,来保障节点的交互。本文主要通过分析现有的分布式P2P网络中的信任模型,在服务选择的应用研究中,分析并设计了服务选择的体系结构及基于声望的信任模型的流程,用于指导提供服务选择的接口实现。在路由选择和资源发现中,分别给出不同的基于声望的节点信任度的计算、评估更新、消息的转发与反馈及节点的链接更新机制。在确保与高可信节点链接同时,路由选择中采用了发送加密消息的新策略,探测故障节点。而在资源发现中,采用计算转发消息的总消耗来选取最佳路径。同时,通过在高可信节点处设置的链接队列数,避免高可信节点的拥塞。模拟实验和结果分析表明:在基于信任的路由选择和资源发现中的节点交易成功率明显比不使用信任方法的交易成功率高,且能隔离恶意节点;使用路由选择和资源发现中的链接更新方法比纯广播式发送消息的链接方法效率更高,网络更稳定。更多还原

【Abstract】 P2P is acquired more and more attention as a most potential technique in current Internet. Since P2P is dynamic and open, there must be effective mechanism to enhance network security with the help of the trustful mechanism of human-cyber relations to keep the interaction between nodes.In this paper, the procedure of existing distributed trust models is discussed and devised in P2P network, which is the architecture of service options and flow process of fame-based trust model and used to implement the interview of service selections. In route choice and resource option, it displays the calculation and evaluation updating of diverse notes with different rates, message forwarding and acknowledgement notes linking refreshing mechanism and etc. In route choice it adopted new tactic to send encryption message to probe malicious notes at the same time of guaranteeing to connect to high trusty noted. Meanwhile, it can avoid the high trusty noted from being blocked by setting linking array numbers at high-trusty noted. Simulation experiments and results analysis show: transaction successful rate under such two application modes is higher than which without trust models; hostile notes can be isolated; the two models offer better efficiency to send messages and more stable network than simply broadcasting.更多还原