【作者】 赵恒；

【导师】 胡予濮；

【作者基本信息】 西安电子科技大学 ， 密码学， 2005， 硕士

【摘要】 随着P2P 技术的深入研究和广泛应用,P2P 网络中信誉体制的研究也引起很大的关注。安全问题是P2P 网络中信誉体制的关键问题之一。本文研究了P2P 网络中信誉体制的安全性。第一章介绍了P2P 网络中信誉体制的研究背景、意义以及发展现状,指出本文的研究重点-信誉体制的安全性。第二章系统地介绍了P2P网络的基本概念和基本模式,比较了P2P 模式和传统的客户端/服务器模式,分析了P2P 技术的应用、研究现状及发展前景。第三章详细地介绍了本文中用到的密码体制和技术。第四章深入地研究了P2P 网络中信誉体制的安全性,提出一种P2P网络环境下安全有效的信誉体制。第五章研究了信誉体制在P2P 网络中的应用,首次结合P2P 网络中代理解密时需要建立信任代理的问题,具体分析了其应用。 主要工作结果如下: 1 分析了P2P 网络的特点;比较了P2P 模式和C/S 模式,结果表明:P2P 模式在资源利用率、降低成本等诸多方面有明显的优势,但是在安全性、易管理性等方面处于劣势;分析了P2P 技术的应用、研究现状及发展前景。2 针对P2P 网络中保密、认证、完整性、不可否认性、防合谋、实时性以及有效性等问题,应用密码学体制和技术,设计一种安全有效的信誉体制,很好地保证了P2P 网络中信誉体制的安全性。3 研究了信誉体制在P2P 网络中的应用,结合P2P 网络中代理解密时需要建立信任代理的问题,具体分析了其应用,并首次提出一种基于信誉的信任代理创建方案。更多还原

【Abstract】 With the thorough study and broad applications of Peer-to-Peer technology, the study of reputation system in Peer-to-Peer networks has been paid much attention to. Security is one of the key problems in reputation system. This thesis studies the security of reputation system in Peer-to-Peer networks. Chapter one introduces the background, signification and status in quo of study, and indicates that the study of security of reputation system is the keystone of the thesis. In chapter two, the basal concept and mode of Peer-to-Peer is introduced, the mode of Peer-to-Peer is compared with the mode of client/service, and the applications, status in quo of study and the future of Peer-to-Peer technology is analyzed. In chapter three, the systems and technologies of cryptology used in this thesis are presented in detailed. In chapter four, the security of reputation system in Peer-to-Peer networks is studied, and a secure and efficient reputation system in Peer-to-Peer networks is put forward. In the last chapter, the applications of reputation system in Peer-to-Peer networks are analyzed and applied concretely to the problem of building the trust proxy in delegation decryption of Peer-to-Peer networks. The main work in this thesis is as follows: 1 The characters of Peer-to-Peer networks are analyzed; the mode of Peer-to-Peer is compared with the mode of client/service, and the result shows that the mode of Peer-to-Peer has obvious advantages in many aspects and some inferior positions; the applications, status in quo of study and future of Peer-to-Peer technology is analyzed. 2 Aiming at the problems of privacy, authentication, integrity, repudiation, collusion, real-time and efficiency, a secure and efficient reputation system is brought forward by applying the systems and technologies of cryptology, which guarantee the security of reputation system. 3 The applications of reputation system are studied in Peer-to-Peer networks. It is applied concretely to the problem of building the trust proxy in delegation decryption in Peer-to-Peer networks, and a scheme of building a trust proxy based on reputation system is presented firstly.更多还原