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Covert listening devices
This part of the website is dedicated to small devices that are used
to covertly
record or intercept a conversation. Such devices are commonly
known as bugs and are usually hidden inside the room where a conversation
takes place, but may also be hidden inside a wall or work through it.
According to Wikipedia, a bug is a covert listening device [1].
Although many bugs have a built-in transmitter (radio bug), this is by
no means mandatory. They can also be wire-based (wire bugs) or connected
to existing devices (wire tap bugs). Some bugs are in fact recording devices
that are collected after the conversation has taken place.
Some modern bugs have a built-in video camera and a TV-transmitter,
allowing the conversation to be viewed in a nearby room as well.
Some devices are available from commercial shops and websites,
such as The Spy Shop and eBay,
whilst others are made especially for
government agencies and are not
available to the general public.
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Complete surveillance systems
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Professional radio bugs often feature a technique known as
audio masking,
or just masking,
to hide the intelligence from
casual eavesdroppers as well as professional sweep teams. Masking
commonly involves techniques like subcarrier modulation and
Pulse Position Modulation (PPM).
➤ More about audio masking
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Help us expand this section
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This section of the website is by no means finished or complete.
We are still looking for additional bugs to expand our collection and
show them on the website. We are particularly interested in bugs
that were used by the Stasi, the secret police of the former DDR (East Germany).
If you have any bugs or related devices that are not shown here, please
contact us.
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Any links shown in red are currently unavailable.
If you like the information on this website, why not make a donation?
© Crypto Museum. Created: Monday 29 April 2013. Last changed: Tuesday, 19 March 2024 - 16:29 CET.
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