dead letter box

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dead letter box

[¦ded ′led·ər ‚bäks]
(communications)
A file for storing undeliverable messages in a data communications system, particularly a message switching system.
References in periodicals archive ?
The retrieve: The dead drop is a "do nothing" technique: Keep your rod still and move the lure only with the turn of the reel handle.
Full of code words and dead drops, the story of Robert Philip Hanssen, according to the FBI, reads like Cold War spy novel.
Stashes of diamonds, secret dead drops of classified documents, Swiss bank accounts .
Assuming he is not an utter fabricator, Shvets is good in sketching the details--silly and serious--of the intelligence craft: shaking tails, recruiting agents, running dead drops.
The official versions emphasize aggressive FBI legwork in interrogating Hanssen and monitoring his dead drops, and what the FBI history describes as the bureau's "intensive physical and electronic surveillance of Ames during a 10-month investigation.
His story covers exotic and dangerous operations such as spy exchanges, dead drops, sleeper agents, recruiting and running moles, false identities, turning captured spies into double and triple agents, psychological warfare, disinformation, kidnapping, Romeo spies, and the never-ending quest for hard currency to pay off his West German agents.
There was no booking or waiting for the sub tropical Aqua Mundo pool and my daughter had the time of her life on the slides and water features from rapids and dead drops to snorkelling amongst coral reefs with a chance to see beautiful tropical fish and even sharks.
The investigations into the cases of Shahid Toumia and Ghazwan Shahin, both colonels, have revealed their alleged involvement in spying for Israel and passing on sensitive information about army and Hizbullah positions before, during and after the July 2006 war, relying on advanced communications equipment supplied to them by Israeli handlers and funding their operations through money received in dead drops by the Israelis.
The illegals could operate as a kind of "stay-behind" network to handle dead drops, cash transfers and agent meetings.