A dead letter drop, also known as a dead drop, refers to a clandestine method used to exchange information or materials between individuals involved in covert operations or espionage activities. It entails a discreet location or object where individuals can discreetly leave or retrieve items without directly interacting with one another. The purpose of a dead letter drop is to maintain secrecy and avoid direct contact, reducing the risk of detection or surveillance.
Typically, a dead letter drop involves selected individuals leaving hidden messages, tangible objects, or documents in predetermined locations, such as under loose stones, in hollow tree trunks, or within specially designed concealment devices. These locations must be inconspicuous yet easily recognizable to those involved in the operation.
Agents utilizing a dead letter drop communicate the location and exchange specifics through predefined signals, codes, or covert means to ensure secure transmission and receipt. By employing these covert techniques, the risk of interception or compromise is significantly minimized, allowing for crucial and sensitive information to be exchanged without raising suspicion.
The term "dead letter drop" originates from the practice of using a letter drop that is no longer active, ensuring that any interception or surveillance directed towards it would yield no useful information. This method has been employed by intelligence agencies, spies, and individuals engaged in illicit activities as a means to safeguard communication and maintain operational security.
