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| On the Entropy Preservation of Information Electromagnetic Leakage from CRT Visual Display Unit |
| Dong Shi-wei; Xu Jia-dong |
| Dept of Electron. Eng.,Northwestern Polytechnical University Xi’an 710072 China |
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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 information’s 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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Received: 27 October 2002
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2004, Vol. 26 
