CRT顯示器信息電磁泄漏保熵性研究
On the Entropy Preservation of Information Electromagnetic Leakage from CRT Visual Display Unit
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摘要: 將CRT顯示器和偵收系統(tǒng)組視為一個通信系統(tǒng)，建立了不同顯示內(nèi)容時的兩種信源模型和與之對應(yīng)的信宿模型。結(jié)合信源熵?fù)p失率和信宿熵獲取率的概念，討論了此通信系統(tǒng)的保熵性，指出CRT顯示器顯示圖像時系統(tǒng)不具備保熵性而顯示文本時具備保熵性。分析了造成以上區(qū)別的原因，并提出一種防止CRT顯示器顯示文本時信息電磁泄漏的方法。文中給出的算例和實(shí)驗(yàn)結(jié)果都與理論分析一致。
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關(guān)鍵詞:
- CRT顯示器; 信息電磁泄漏; 圖像; 文本; 保熵性
Abstract: Considering CRT visual display unit and reconnaissance-receiving system as a communication system, this paper sets up two information source models and their corresponding information sink models of informations electromagnetic leakage from CRT visual display unit when image and text are displayed on the screen. Entropy preservation of the system is discussed combined with the concept of entropy loss rate of information source and entropy acquisition rate of information sink. A measure is put forward to ensure the information security of CRT visual display unit. The computational and experimental results show the consistance with the theoretical analysis. -
Han Fang. Radiation emission from CRT of computer VDU. Rec. 1990 IEEE Int. Symp. on EMC, Washington D. C., USA, 1990: 483-487.[2]Dong Shiwei, Xu Jiadong, Zhang Haobin, et al.. On compromising emanations from computer VDU and its intercepting. 2002 3rd International Symposium on Electromagnetic Compatibility Proceedings, Beijing, China, May 21-24, 2002: 692-695.[3]Kuhn M G, Anderson R J. Soft tempest: Hidden data transmission using electromagnetic emanations. in David Aucsmith (Ed.), Information Hiding, Second International Workshop, Portland,Oregon, USA, April 15-17, 1998, Springer, LNCS 1525: 124-142.[4]Wim van Eck. Electromagnetic radiation from video display units: An eavesdropping risk[J].Computers Security.1985, 4(4):269-286[5]董文彬,殷明,康四軍.并行復(fù)合源電磁信息泄漏的非保熵性.微波電磁兼容及超高頻移動通信技術(shù)第三屆全國學(xué)術(shù)會議論文集,湖南張家界,Oct.1996:45-52.[6]R.米特拉著,金元松譯.計(jì)算機(jī)技術(shù)在電磁學(xué)中的應(yīng)用.北京:人民郵電出版社,1983:197-207.[7]Rao S M, Wilton D R. Transient scattering by conducting surfaces of arbitrary shape[J].IEEE Trans. on Antennas and Propagation.1991, 39(1):56-61[8]朱雪龍.應(yīng)用信息論基礎(chǔ).北京:清華大學(xué)出版社,2001:14-38. -
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