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During the Cold War,
Soviet intelligence services
placed microphones
in any hotel room that was known to be used by Western diplomats, so that
compromising intelligence could be gathered.
The image on the right show three different types of KGB microphones
that have recently (re)surfaced (2018). The one at the left is the largest,
but is also the most sensitive one. It has a rather
large cylindrical sound port
at the front that can be attached to a plastic or wooden tube, allowing
it to be hidden deep inside a wall where it could not be discovered with
a metal detector.
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The wiring was usually embedded deeply inside the wall, or hidden inside
existing infrastructure, such as the metal pipes of the heating system.
As a result, it was generally difficult to discover the microphones and
their wiring, making it one of the most effective methods of eavesdropping.
Compared with today's ultra-minature MEMS microphones, such as the ones
made by Knowles in the USA,
the KGB microphones shown here are relatively large.
Nevertheless, they could still be a serious threat today — especially when they
are appropriately hidden — and they are sometimes even more sensitive than their
electronic equivalents, not least because of their larger membrane.
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© Crypto Museum. Created: Monday 10 December 2018. Last changed: Tuesday, 02 July 2019 - 15:06 CET.
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