匿名网络环境下审查规避技术研究

发布时间：2018-03-23 17:20

本文选题：网络审查　切入点：审查规避　出处：《北京邮电大学》2017年硕士论文

【摘要】：在“互联网+”快速发展的今天,人们的生活、工作和沟通方式得到了极大的改善。虽然互联网本应该给人们带来更大的自由,但由于网络的开放性和复杂性,互联网上的信息非常难以控制。在网络促进信息和知识快速传播的同时,为了控制各种非法的、敏感的信息在互联网上泛滥,由此便形成了网络审查制度。针对不同的网络审查技术,涌现出一系列匿名审查规避系统和技术。匿名审查规避技术快速发展的同时,也得到了学术界的广泛关注。随着各种匿名审查规避技术的快速发展,对匿名审查规避技术的研究,有十分重要的应用价值。本文首先调研了网络审查技术和审查规避技术。主要对网络审查技术和匿名审查规避技术的发展和相关概念进行了综述,从技术原理和抗审查的能力两个方面对匿名审查规避技术进行了总结和分类。其次,本文提出了一种利用流量填充技术来实现匿名审查规避的方案 DTCS( Dummy Traffic Circumvention Scheme)。论文首先对 DTCS方案中涉及的Tor、StegoTorus、流量填充以及流量传输策略等相关技术进行分析。并对DTCS匿名审查规避方案的设计目标、威胁模型、总体架构,关键模块设计等进行详细的阐述。最后根据不同的流量传输策略以及流量包到达分布情况,推导出DTCS方案中流量填充模块的评估标准,即流量填充错误率。最后,我们对DTCS匿名审查规避方案中关键模块的代码设计进行阐述。根据本文中推导的评估标准,将对DTCS方案中的流量填充模块的评估分为阈值泊松策略、定时泊松策略、阈值帕累托策略、定时帕累托策略、阈值二项式策略、定时二项式策略和消息池策略七种情况。分别分析每种情况下所涉及的参数对流量填充错误率的影响。
[Abstract]:Today, with the rapid development of the Internet, people's life, work and communication methods have been greatly improved. Although the Internet should have brought people greater freedom, due to the openness and complexity of the network, Information on the Internet is very difficult to control. While the Internet promotes the rapid spread of information and knowledge, in order to control the proliferation of illegal and sensitive information on the Internet, In view of different network censorship technologies, a series of anonymous censorship evasion systems and techniques have emerged. At the same time, anonymous censorship evading technology has developed rapidly. Along with the rapid development of various anonymous censorship evading technology, the research on anonymous censorship evading technology, It has very important application value. Firstly, this paper investigates the network censorship technology and the audit circumvention technology. It mainly summarizes the development and related concepts of the network censorship technology and the anonymous censorship circumvention technology. This paper summarizes and classifies anonymous censorship evasion technology from the aspects of technical principle and ability to resist censorship. Secondly, In this paper, we propose a Dummy Traffic Circumvention scheme (DTCS), which uses traffic padding technology to realize anonymous audit evasion. Firstly, the paper analyzes the related techniques such as Toro Stego Torus, traffic padding and traffic transmission strategy in DTCS scheme. The design goal of the aversion scheme for anonymous review of DTCS, The threat model, overall architecture, key module design and so on are described in detail. Finally, according to different traffic transmission strategies and traffic packet arrival distribution, the evaluation criteria of flow filling module in DTCS scheme are deduced. Finally, we describe the code design of the key modules in the DTCS anonymous audit avoidance scheme. According to the evaluation criteria derived in this paper, the evaluation of the flow filling module in the DTCS scheme is divided into threshold Poisson strategy. Timing Poisson strategy, threshold Pareto strategy, timing Pareto strategy, threshold binomial strategy, timing binomial strategy and message pool strategy are analyzed respectively.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0

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