Evaluation of Information Leakage from PC Displays Using Spectrum Analyzers

Toshihide TOSAKA  Yukio YAMANAKA  Kaori FUKUNAGA  Ryo ISHIKAWA  Mitsuo HATTORI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B   No.11   pp.3315-3318
Publication Date: 2007/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.11.3315
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
electromagnetic disturbance,  electromagnetic security,  PC display,  

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Summary: 
To evaluate whether electromagnetic disturbances that leak from PC displays contain information or not, we need to reconstruct the information from the measured disturbance. This requires a special receiver, and not all test houses have a special receiver. In this paper, we propose performing the evaluation with the spectrum analyzers commonly used for EMI measurement. First, we select a spectrum that containing the frequency component of the vertical sync signal using a spectrum analyzer (SA1). Then, we measure the video output of SA1 using another spectrum analyzer (SA2) and evaluate the disturbance from the frequency component of the horizontal sync signal.