【作者】 樊恩；

【导师】 聂明新；

【作者基本信息】 武汉理工大学 ， 通信与信息系统， 2007， 硕士

【摘要】 人类社会的信息化进程一日千里，信息对抗作为争夺信息资源的技术手段在世界范围内广受关注，与之相关的信息战、信息安全、电子战等前沿技术成为热门话题。20世纪50年代初，美国军方发现计算机系统的杂散电磁发射会导致敏感信息的泄漏，并认为这将成为信息对抗的新领域，由此展开了信息技术设备的信息电磁泄漏防护与侦收(TEMPEST)技术研究。目前处理敏感信息最常用的信息技术设备是计算机系统，所以大多研究针对计算机及其外部设备。在计算机系统中，CRT显示设备是辐射最强、可视信息量最大、最易截获复现视频信息的设备。从信息电磁泄漏侦收的角度，本文研究了计算机视频泄漏信息窃取的相关理论，分析了该领域中的关键技术及实现方法，对视频泄漏信息的信号处理与还原技术进行探讨，实现了文本视频信息的泄漏还原。本文从电磁场理论的基础上对信息电磁泄漏展开研究。从计算机显示器的结构、工作原理和产生电磁辐射的原因等方面进行分析，研究计算机电磁信息泄漏的机理；分析视频信息的泄漏机理及同步特征，指出视频泄漏信息截获的理论依据。本文侧重对截获视频泄漏信息的信号处理与还原研究，指出由视频泄漏信息的存储信号重构视频图像以及图像清晰化的方法。在对视频泄漏信息窃取试验中，不仅实现了显示设备对视频泄漏信息的直接复现，还实现了利用视频泄漏信息的特征量来重建计算机所泄漏的视频信息。将精密存储设备采集的泄漏信息完全由计算机进行信号处理与特征分析，通过提取泄漏信息的同步特征信号，实现视频泄漏信息的复现。数字信号处理软件的设计为实现信息电磁泄漏侦收系统的DSP设计提供参考。本文以理论与实验相结合的方式对计算机视频泄漏信息的窃取、信号处理与还原技术进行研究，希望能为后续的研究奠定一些基础。更多还原

【Abstract】 The processing of human social information industry goes at a tremendous pace. As an instrument to dispute information resource, informing counterwork has much more attention all over the world. The interrelated information war, information security, electronic warfare and so on would be the hot topics. The beginning of 20C50s, the military authority of the United States discovered miscellaneous emanation of electromagnetism in the computer system will cause sensitive information leaked, thought that this will become the new realm of information resist, launching the technique research to information electricity magnetic leakage protection and interception of the information technology equipments. The computer system is the most common information technology equipment to process sensitive information, so the most researches are pointed to the computer and its peripheral equipments.In the computer system, CRT is the display equipment that radiates most strongly, having most visible information, and the video information can be intercepted most easily. In point of information leakage intercepting, the thesis studies the related theory of intercepting the computer video leakage information, analyses the key techniques and methods to realize, discusses the recovering technique from the video leakage information, and the reconstruction of the text leakage information is realized.This thesis studies electromagnetic information leakage mechanism on the basis of electromagnetic radiation. Electromagnetic information leakage mechanism of electron beam in cathode ray tube (CRT) of computer video display unit (VDU) is analyzed as a special example. The video information leakage mechanism and synchronization characteristic is analyzed and the theory basis to intercept video leakage information is pointed out. This thesis mainly researches the recovering of intercepted image information, and the methods of recovering and shaping the image are described. In the experimentations of intercepting the video leakage information, not only reconstructing the leakage information directly is realized, but also reconstructing by extracting synchronization characteristic signals from leakage video information. The leakage information, sampled and memorized by the high precision memory, processed by the computer to process the signals, analyze the characteristic, extract the synchronization characteristic signals, and realize the reconstruction of the video leakage information. The design of digital signal processing software provides a reference to realize the design of information electromagnetic leakage interception system based DSP.The interception technology, signal processing and recovering technology of computer video leakage information is studied theoretically and experimentally in this thesis. The author expects to lay a solid foundation for further research.更多还原