发布时间：2015-01-24 来源：人大经济论坛

通信工程专业论文 目 录 目 录III 1绪 论1 1.1课题研究背景与意义1 1.1国内外研究现状2 1.1.1P2P系统中的匿名性3 1.1.2基于P2P的匿名通信机制4 1.2论文结构和研究内容6 1.3本章小结6 2P2P中的一种基于分组填充Mix策略的匿名通信机制7 2.1引 言7 2.2信息量分析攻击8 2.3基于分组填充Mix策略的匿名通信机制8 2.4本章小结9 3NS2平台简介10 3.1NS的简介10 3.2NS原理11 3.2.1丰富的构件库12 3.2.2离散时间模拟器11 3.2.3分裂对象模型12 3.2.4开放的源代码13 3.3NS的一般过程13 3.4本章小结14 4模拟与分析15 4.1基于分组填充Mix节点模拟15 4.1.1Mix基本模型15 4.1.2模拟过程及结果15 4.1.3模拟总结22 4.2基于P2P的Mix网络通信模拟22 4.2.1基于P2P的Mix网络模型22 4.2.2模拟过程及结果23 4.2.3模拟总结27 4.3本章小结27 结 论28 致 谢29 参考文献30 附录A：Mix_Simulation_Result32 附录B：部分模拟代码36 附录C：模拟程序环境搭建说明44 摘 要 随着计算机网络的日益普及以及因特网的迅速发展,网络已经广泛应用到了个人,团体和政府部门之间的通信。网络安全和隐私通信日渐受到人们的关注和重视，许多因特网应用都需要匿名支持，匿名通信的研究成为当前的一个研究热点。为了满足各种隐私需求，我们有必要研究匿名通信的相关技术。 P2P网络中主要采取重路由技术进行匿名通信，而采取重路由技术的匿名机制有Mix和洋葱路由。Mix机制为实现匿名通信技术提供了可行的解决方案，但攻击者仍可以在一定程度上通过流量分析来获取通信关系。为了进一步提高Mix机制对抗信息量分析攻击的能力，提出了分组填充的思想，并基于分组填充Mix策略给出了一种新型匿名通信机制。与传统Mix机制相比，新的基于分组填充的Mix机制，能在有效抵御信息量分析攻击的同时，进一步降低网络的额外带宽开销。 最后，利用NS2对基于分组填充Mix机制和基于P2P网络的Mix网络通信进行了模拟。 关键词：P2P；NS2；Mix；匿名通信；分组填充 Research of the anonymous communications algorithm in P2P network Abstract With the rapid progress of information technologies, computer networks have been widely used in communications among individuals, parties and governments. Concerns on security of network and privacy of communication have been grown. Anonymity needed by many applications on Internet, A research focus which become present of research of anonymous communication. We study the problems of partially connected network traffic camouflage, rerouting path selection in anonymity systems and scalar anonymity. The rerouting path selection is a most popular technology for P2P anonymous communication. It is usually implemented in the Mix mechanism and Onion Routing Protocol. The Mix mechanism has provided a feasible solution for the realization of anonymous communication, but to a certain degree, the attackers can still obtain the correspondence relations through traffic analysis. In order to further improve the ability of Mix mechanism to resist the traffic analysis of message volume, a kind of scheme named group padding is proposed, and based on which, a novel anonymous correspondence mechanism is designed additionally. Compared with the traditional Mix mechanism, the newly proposed Mix mechanism based on group padding scheme can resist traffic analysis of message volume effectively, and needs lower extra bandwidth simultaneously. Finally, utilize NS2 platform to simulate and analysis about a grouped padding Mix mechanism and the Mix network communication based on P2P. Key words: P2P；NS2；Mix； anonymous communication；group padding