P2P信任与信誉机制研究

项目名称： P2P信任与信誉机制研究

项目编号： No.60873075

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 秦志光

作者单位： 电子科技大学

项目金额： 34万元

中文摘要： P2P网络具有动态、匿名，自组织等特性，给用户带来便捷的同时也引发大量安全问题。由于网络节点之间信任关系不确定，导致了节点行为不稳定，共享资源不可靠。这些问题极大地制约了P2P网络的进一步发展，在P2P网络中引入信任机制可以有效遏制上述问题的负面影响。本项目对P2P网络节点间信任和信誉机制进行了深入研究。内容涉及到信任建模，存储策略，以及信任机制和具体的P2P应用场景相结合。在信任建模方面，深入分析了影响信任关系的内部因素，以及如何基于节点信誉值选择可靠服务节点，提出了信任路径的发现方法；在信息存储方面，引入理论分析模型讨论了复制与纠删码策略产生的带宽成本，并提出了混杂式存储策略；在信任机制与P2P应用的结合方面，提出了利用节点信誉信息指导结构化P2P网络中的路由决策方法，以及基于信誉机制实现P2P网络中公共资源的分配。本课题的研究成果对于解决P2P网络中的安全问题具有重要意义。

中文关键词： 对等网络；信任；信誉；分布式存储系统；最优路径选择

英文摘要： The users can enjoy great convenience from P2P networks due to the dynamic, anonymous and the self-organization features of P2P networks. However, it is such characteristics that lead to a large number of security issues in P2P networks. Because the trust relationship between network nodes is uncertain, the behavior of nodes is unstable and the shared resources are not reliable. These problems have greatly restricted the further development of P2P networks. It is an effective method that the trust mechanisms are introduced into the P2P networks to curb the negative impact. In this project, the trust and reputation mechanisms are studied in depth.The research covers the trust modeling,storage strategies and combination of the trust computation and specific P2P scenarios. For modeling the trust relationship, the internal factors that probably affect the trust relationship are analysed. Moreover, we provide new methods to search the trust path in unstructed P2P networks and discuss how to choose a reliable service nodes by the reputation values. For the information storage, the theoretical model are presented to discuss the bandwidth costs caused by the replication and the erasure coding redundancy strategies. In addition, a hybrid storage method is designed. For specific issue in P2P applications, we propose the routing decision-making methods based on the reputation of the forwarding nodes, as well as reputation-based mechanism to archive fair allocation of the resources in P2P networks. This research outcomes are important for solving the security issues in P2P networks.

英文关键词： peer-to-peer networks; Trust; Reputation; Distributed storage stragy; Optimistic route decision