信息网络安全

信息网络安全 ›› 2015, Vol. 15 ›› Issue (9): 101-105.doi: 10.3969/j.issn.1671-1122.2015.09.024

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电磁泄漏耦合发射的应用研究

石军   

  1. 北京市保密技术中心,北京100005
  • 收稿日期:2015-07-15 出版日期:2015-09-01 发布日期:2015-11-13
  • 作者简介:

    作者简介： 石军(1975-),男,山东,高级工程师,硕士,主要研究方向:混沌在通信系统及信息技术中的应用、通信信号识别及信息安全等。

Study on the Application of Coupling Technology Based on Electromagnetic Compromising Emanation

Jun SHI   

  1. Institute of Information Security Technology of Beijing State Secrets Bureau, Beijing 100005, China
  • Received:2015-07-15 Online:2015-09-01 Published:2015-11-13

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摘要：

针对信息技术设备附近各种金属导体可能引起电磁信息泄漏这一安全隐患,文章给出了基本的网络终端电磁泄漏发射及耦合发射机理,提出了基于QQ即时通信、移动通信和固定电话通信等三类线缆电磁耦合发射实验模型。通过对RS-232串口线缆耦合截获实验,证实了在通信系统A/D采样率满足奈奎斯特抽样定理且系统编码不会把耦合信号损失掉的情况下,耦合泄漏信号不会因为通信中继而消除,可以传输到通信系统所及的范围,即可以从信息技术设备及其线缆附近的金属导体上截获并还原有用信息。文章讨论了各实验模型最高泄漏信号速率及提升速率方式,证实不失真泄漏信号传输速率与系统A/D采样及编码有关,是受限的。另外,文章给出了基于电力线载波通信、漏泄通信及“Soft-TEMPEST病毒”等泄密途径,结合实际给出电磁泄漏耦合发射的应用案例。最后,文章提出了针对性的防护方法。

关键词: 红信号识别, 电磁泄漏发射, 调制技术, 耦合, 信息窃取

Abstract:

This security problem based on information leakage caused by electromagnetic coupling of metal cables nearby information technology equipment is mentioned.The fundamental electromagnetic compromising emanation models based on network terminal and coupling signal are set up. Three kinds of cable electromagnetic coupling emission model experiment based on QQ instant messaging, mobile and fixed telephone communication are proposed. Coupling leakage signal cann’t be eliminated by communication relay and can be transmitted to the range of communication systems under the condition of a communication system A/D sampling rate to satisfy the Nyquist sampling theorem and the coupling signal not lost by system coding. It is proved by experiments on RS-232 that available data can be reproduced from metal cables nearby information equipment. The highest leakage signal rate and the increasing signal rate methods of the experimental models are discussed. It is proved that the distortionless leakage signal transmission rate is related to A/D sampling and coding system and limited. In addition,the information leakage Approaches based on power line carrier communication, leakage communication and “Soft - TEMPEST virus” are discussed and a actual Coupling Emanation case is given. Finally, these methods of reducing electromagnetic information leakage are discussed. It is hoped that the results play an important role in electromagnetic coupling emanation and better prevent information leakage.

Key words: red signal recognition, electromagnetic compromising emanation, modulation technology, coupling, eavesdropping

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