CRT显示器信息电磁泄漏保熵性研究
On the Entropy Preservation of Information Electromagnetic Leakage from CRT Visual Display Unit
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摘要: 将CRT显示器和侦收系统组视为一个通信系统，建立了不同显示内容时的两种信源模型和与之对应的信宿模型。结合信源熵损失率和信宿熵获取率的概念，讨论了此通信系统的保熵性，指出CRT显示器显示图像时系统不具备保熵性而显示文本时具备保熵性。分析了造成以上区别的原因，并提出一种防止CRT显示器显示文本时信息电磁泄漏的方法。文中给出的算例和实验结果都与理论分析一致。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.
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