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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 an agent, or two agents) via a secret location. By avoiding direct meetings, individuals can maintain operational security .
Representative dead drop device. Signals to tell a courier, or a case officer if there is no intermediate courier, that the dead drop needs service can be as simple as a piece of colored tape on a lamp post or perhaps a set of window shades raised and lowered in a specific pattern.
However, Hanssen's suspicions did not stop him from making one more dead drop. After leaving a friend at an airport on February 18, 2001, Hanssen drove to Virginia's Foxstone Park. He placed a white piece of tape on a park sign to signal his Russian contacts that there was information at the dead drop site.
Dead Drop, a location-based spy game for iPhone, It's that tie to real-world locations that services like Foursquare do so well that games tend to miss. Dead Drop on iPhone, Android brings the ...
The fake dead drop site could then be periodically checked for signs of disturbance. If the site showed signs of being disturbed (for instance, in order to copy microfilm stored there), then this would confirm that the suspected enemy really was an enemy, i.e., a double agent.
The cavity had a metallic diaphragm that moved in unison with sound waves from a conversation in the room. When illuminated by a radio beam from a remote location, the cavity would return a frequency modulated signal. The United States Embassy in Moscow was bugged during its construction in the 1970s by Soviet agents posing as laborers. When ...
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The strategist said bitcoin was flashing a "sell" signal, given recent trading patterns. She predicted the crypto could find support around $84,500, implying a 10% drop from current levels.