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Diversion safe, stash, microcache

A concealement device, or diversion safe, is an oject that has been modified to hide things for the purpose of secrecy or security. They are commonly made from ordinary household objects in order to attract as little attention as possible. Examples are a hollow coin, a soda can with a false bottom, or a prepared book. A special kind of concealment device is the so-called dead-drop.

A good example of a concealment device is the walnut shown in the image on the right. Its contents have been removed to provide storage space for – in this case – a One-Time Pad (OTP).

Concealment device are commonly used to hide things, such as money, secret codes, chemical substances, maps, fake IDs, microfilms, suicide pills, etc. for a longer period of time. They can also be used for smuggling goods accross the border, for example as a travel kit or a briefcase with a false bottom. Virtually any common object can be modified to act as a concealment device.
Walnut concealment device with two OTP booklets

Concealments can also be used to hide a covert listening device (bug), such as the triangular piece of wood shown below. A special kind of concealment device is the so-called dead drop, a special container that is used to exchange objects and information between people, without the need to physically meet each other. Such dead drop containers are generally purpose-made.

Virtually any common object can be converted into a concealment device. For example: a metal bolt, a coin, a stone, a brick, a ballpoint, a food can, a picture frame, a razor, a cut-out book or even a piece of food like a walnut. Below are some popular examples. Click them for further info.

Concealment devices on this website
Walnut concealment device with two OTP booklets Commonly looking bolt which is actually a concealment device 32GB Micro-SD memory card inside a 50 Euro-cent coin At first glance: a normal stone Travel kit with concealment area for passport and OTP Hungarian RF bug 31217-132 (Botond) concealed in piece of wood
Dead drops on this website
 Dead drop containers

A stash is a secret hiding place in which personal objects, such as money, ID papers, frequency lists, drop pick locations and code material, are hidden. When an object is used as a stash, it is also known as a concealment device, much like a dead drop. In fact, many concealment devices are suitable as a dead drop as well as a stash, which is why we have listed them together here.

  1. Wikipedia, Concealment device
    Retrieved August 2015.
Further information
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Crypto Museum. Created: Friday 24 October 2014. Last changed: Thursday, 04 October 2018 - 11:50 CET.
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