Electromagnetic Radiation from Video Display Units: An Eavesdropping Risk?

by Wim van Eck.

This paper describes the results of research into the possibility of "eavesdropping' on video display units. by picking up and decoding the electromagnetic interference produced by this type of equipment. During the research project. which started in January. 1983. it became more and more clear that this type of information theft can be committed very easily using a normal TV receiver. It is well known that electronic equipment produces electromagnetic fields which may cause interference to radio and television reception. The phenomena underlying this have been thoroughly studied over the past few decades. These studies have resulted in internationally agreed methods for measuring the interference produced by equipment. These are needed because the maximum interference levels which equipment may generate have been laid down by law in most countries. [via]

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