Reconstruction of Printed Image Using Electromagnetic Disturbance from Laser Printer

Toshihide TOSAKA  Kazumasa TAIRA  Yukio YAMANAKA  Kaori FUKUNAGA  Atsuhiro NISHIKATA  Mitsuo HATTORI  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.3   pp.711-715
Publication Date: 2007/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.3.711
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electromagnetic Compatibility(EMC)
electromagnetic disturbance,  electromagnetic security,  laser printer,  

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The electromagnetic disturbance that leaks from ICT (information and communications technology) equipment might contain important information. Our measurements show that the information hidden inside of the electromagnetic disturbance can be monitored. First, we measured the level of the electromagnetic disturbance that leaks from laser printers and collected the waveform in the time domain. Then, we reconstructed the printed image from the data. As a result of our measurements, we found that at points 200 cm away or beyond it is difficult to reconstruct the printed image, and therefore the threat to electromagnetic security is not significant.