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Concealment device
This ordinary-looking metal bolt is in fact a
concealment device that
can be used in espionage tradecraft as a so-called dead drop.
Objects like this are commonly used by agents and their handlers to pass
small objects without attacting attention from the enemy's security forces [1].
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When closed, the device looks like an ordinary metal bolt that would attact
no attention when found in, say, a toolbox in someone' shed. In reality
however, this bolt has a secret storage compartment which can be used to
hide small objects, such as money, cryptographic keys,
frequency tables, secret contact information, instructions, or even a
small computer chip.
In order to prevent its discovery, the removable head has reverse thread,
which means that you have to turn it clockwise to get access to the container.
An O-ring makes the bolt watertight.
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Devices like this were very popular during the Cold War, but are probably
still used by spies today. The device shown here is a high-quality
reproduction which was found on eBay.
It is available in three different sizes and can
not be distinguised from any ordinary metal bolt.
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© Crypto Museum. Created: Monday 06 October 2014. Last changed: Tuesday, 13 June 2017 - 10:50 CET.
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