网络内容审计系统的研究与实现

发布时间：2018-03-05 06:52

本文选题：内容审计　切入点：协议分析　出处：《西安建筑科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着互联网的发展，越来越多的公司加入到互联网之中。网络技术的广泛应用，给人们的通信交流带来了很大的方便，但是与此同时也导致了新的网络安全问题：个人隐私、企业的商业机密可能随时通过网络泄露，谣言、黄色信息在网上泛滥却难以得到有效根治。解决涉及网络的泄密以及违法信息的传播有很多方法，从事后审计追责的方面来看，我们需要一种能够自动过滤网上内容的监控系统，，以便于能够及时发现问题并对责任者进行定位，进行责任追究。本文设计了一个基于旁路接入的网络内容审计系统，目的就是为了解决上述问题，能够对进出网络的邮件以及其中的附件进行完整的捕获、还原、存储，从而到达内容审计的作用。本文首先分析了网络内容审计系统可能需要采用的不同技术，接着明确了基于旁路接入技术的网络内容审计系统的功能定位和系统的核心流程。在此基础上，分析了系统的总体架构，并且详细描述了各个系统模块的设计原理与架构。其次字符串匹配是网络内容审计中关键技术之一，匹配的速度直接影响到网络内容审计系统的工作性能。本文在分析传统的Sunday算法的基础上，提出了一种改进的字符串匹配算法—Sunday2。该算法是用主串后两个字符来遍历模式串，确定模式串下一次右移的距离，并且在匹配过程中，优先匹配模式串中低出现概率的字符，以减少匹配次数。最后，本文对系统进行了测试，各项功能和性能基本上达到了研发的预期目标。通过对测试结果的分析，总结了系统的优点和不足。指出了网络内容审计系统的下一步研发思路和方向。
[Abstract]:With the development of the Internet, more and more companies join in the Internet. The wide application of network technology brings great convenience to people's communication and communication, but at the same time, it also leads to a new network security problem: personal privacy. Business secrets of an enterprise may be leaked through the Internet at any time, rumors and pornographic information are flooding on the Internet but it is difficult to effectively cure them. There are many ways to solve the problem of leakage involving the Internet and the dissemination of illegal information. From the aspect of audit and accountability afterwards, We need a kind of monitoring system which can automatically filter the online content, so that we can find out the problem in time, locate the responsible person and investigate the responsibility. A network content audit system based on bypass access is designed in this paper. The purpose of this system is to solve the above problems and to capture, restore and store the incoming and outgoing mail and its attachments. In order to achieve the role of content audit. This paper first analyzes the different technologies that may be used in the network content audit system, then clarifies the function orientation and the core process of the network content audit system based on bypass access technology. The overall architecture of the system is analyzed, and the design principle and architecture of each system module are described in detail. Secondly, string matching is one of the key technologies in network content audit, and the speed of matching directly affects the performance of network content audit system. An improved string matching algorithm named Sunday2 is proposed. The algorithm traverses the pattern string with the following two characters of the main string, determines the distance of the next right shift of the pattern string, and in the course of matching, preferentially matches the characters with low probability of occurrence in the pattern string. To reduce the number of matches. Finally, the system is tested in this paper. The function and performance of the system basically reach the expected goal of the research and development. Through the analysis of the test results, This paper summarizes the advantages and disadvantages of the system, and points out the thought and direction of the next research and development of the network content audit system.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.08

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