文档介绍：ic Radiation from Video
Display Units: An Eavesdropping Risk?
Wim van Eck 1. Introduction
PTT Dr. Neher Laboratories, St. Paulusstroat 4. 2264 XZ
Leidschendam, herlands
It is well known that electronic equipment produces
ic fields which may cause interference
to radio and television reception. The phenomena
This paper describes the results of research into the possibility of underlying this have been thoroughly studied over the
"eavesdropping' on video display units. by picking up and
decoding the ic interference produced by this type past few decades. These studies have resulted in
of equipment. During the research project. which started in internationally agreed methods for measuring the
January. 1983. it became more and more clear that this type of
information theft can mitted very easily using a normal interference produced by equipment. These are needed
TV receiver. because the maximum interference levels which
equipment may generate have been laid down by law
in most countries.
Keywords: ic radiation, eavesdropping, data However, interference is not the only problem caused
security, privacy, patibility. by ic radiation. It is possible in some
cases to obtain information on the signals used inside
the equipment when the radiation is picked up and the
received signals are decoded. Especially in the case of
digital equipment this possibility constitutes a
problem, because remote reconstruction of signals
inside the equipment may enable reconstruction of the
data the equipment is processing
This problem is not a new one; defence specialists
have been aware of it for over twenty years.
Information on the way in which this kind of
"eavesdropping" can be prevented is not freely
available. Equipment designed to protect military
information will probably be three or four times more
expensive than the equipment likely to be used for
processing of non-military information.
Until recently it was considere