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dead drop
A dead drop or dead letter box is a method of espionage tradecraft used to pass items or information between two individuals (e.g., a case officer and agent, or two agents) using a secret location, thus not requiring them to meet directly and thereby maintaining operational security. The method stands in contrast to the live drop, so called because two persons meet to exchange items or information.
==Overview==
Spies (covert intelligence agents) and their handlers have been known to perform dead drops using various techniques to hide items (such as money, secrets or instructions), and to signal that the drop has been made. Although the signal and location by necessity must be agreed upon in advance, the signal may or may not be located close to the dead drop itself, and the operatives may not necessarily know one another or ever meet.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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