| 计算机电磁信息泄漏文字再现 |
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| 引用本文： | 张洪欣,吕英华,贺鹏飞,王海侠.计算机电磁信息泄漏文字再现[J].西南交通大学学报,2007,42(6):653-658. |
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| 作者姓名： | 张洪欣 吕英华 贺鹏飞 王海侠 |
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| 作者单位： | 1. 北京邮电大学电子工程学院,北京,100876
2. 北京邮电大学通信网络综合技术研究所,北京,100876 |
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| 基金项目： | 国家自然科学基金资助项目(60671055,60331010) |
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| 摘 要： | 设计了针对计算机电磁信息泄漏的接收和再现系统.用宽带天线截获电磁信息泄漏信号后,经带通滤波和放大,再用锁相环电路捕获帧同步与行同步信号.同步信号经模数转换后,得到视频数字信号的输出.然后,用平均滤波法对数字视频信号降噪.最后,用匹配滤波器获得再现的文字.测试结果表明,用平均滤波的方法使同步信号的信噪比提高了18.7 dB,可在12 m范围内获取奔腾486主机及阴极射线管显示器泄漏的文字信息.
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| 关 键 词： | TEMPEST 电磁辐射 电磁信息泄漏 信息再现 文字 计算机 |
| 文章编号： | 0258-2724（2007）06-0653-06 |
| 收稿时间： | 2005-11-01 |
| 修稿时间： | 2005年11月1日 |
Text Recovery from EM Leakage of Computers |
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| ZHANG Hongxin,L Yinghua,HE Pengfei,WANG Haixia.Text Recovery from EM Leakage of Computers[J].Journal of Southwest Jiaotong University,2007,42(6):653-658. |
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| Authors: | ZHANG Hongxin L Yinghua HE Pengfei WANG Haixia |
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| Institution: | ZHANG Hongxin,L(U) Yinghua,HE Pengfei,WANG Haixia |
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| Abstract: | A text receiving and recovery system was designed for EM information leakage from computers.After EM leakage is intercepted by a broad band antenna,band-pass filtered and amplified,the vertical and horizontal synchronization signals are captured by a phase locked loop circuit.The synchronization signals are sampled and processed by an analog-digital converter to get digital video signals.Then,the noises of video signals are filtered using an average filter.At last,the text in the digital video is recovered using a matched filter.An experimental result shows that text can be recovered from EM leakage 12 m away for a Pentium 486 computer with a CRT display,and the signal to noise ratios of the vertical and horizontal synchronization signals are increased by 18.7 dB with the average filter. |
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| Keywords: | TEMPEST electromagnetic radiation EM information leakage information recovery text computer |
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