concealment device
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Concealment device — Concealment devices or diversion safes are used to hide things for the purpose of secrecy or security. They are made from an ordinary household object such as a book, a soda can, a candle, a can, or something as small as a coin. The idea is that… … Wikipedia
Concealment — (also called abscondence or hiding) is obscuring something from view or rendering it inconspicuous, the opposite of exposure. A military term is CCD: camouflage, concealment and deception (looks the same as the surroundings, cannot be seen, looks … Wikipedia
drifting fish aggregating device — natural or artificial free drifting objects that attract pelagic fishes, such as tunas. Natural ones are logs and branches and objects of human origin such as oil drums and buoys. Artificial ones are deliberately constructed, such as bamboo rafts … Dictionary of ichthyology
Dead drop — spike A dead drop or dead letter box is a method of espionage tradecraft used to pass items between two individuals by using a secret location and thus does not require them to meet directly. Using a dead drop permits a Case Officer and his Agent … Wikipedia
Cryptography — Secret code redirects here. For the Aya Kamiki album, see Secret Code. Symmetric key cryptography, where the same key is used both for encryption and decryption … Wikipedia
Espionage — Spy and Secret agent redirect here. For other uses, see Spy (disambiguation) and Secret agent (disambiguation). For other uses, see Espionage (disambiguation). Espionage or spying involves an individual obtaining information that is considered… … Wikipedia
Concealing objects in a book — A hollowed out book, with bottle caps for scale. There are many real and fictitious occurrences of concealing objects in a book. Items can be concealed in books in a number of ways. Small items such as a photograph or a note can be hidden in… … Wikipedia
Surveillance — For other uses, see Surveillance (disambiguation). A nest of surveillance cameras at the Gillette Stadium in Foxborough, Massachusetts Surveillance ( … Wikipedia
Direction finding — (DF) refers to the establishment of the direction from which a received signal was transmitted. This can refer to radio or other forms of wireless communication. By combining the direction information from two or more suitably spaced receivers… … Wikipedia
Industrial espionage — Teapot with Actresses, Vezzi porcelain factory, Venice, ca. 1725. The Vezzi brothers were involved in a series of incidents of industrial espionage. It was these actions that led to the secret of manufacturing Meissen porcelain becoming widely… … Wikipedia
Numbers station — Fictional example of a numbers station. Numbers stations (or number stations) are shortwave radio stations of uncertain origin. In the 1950s, Time magazine reported that the numbers stations first appeared shortly after World War II and were… … Wikipedia
