Signals intelligence
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Signals intelligence is the act and field of intelligence-gathering by interception of signals, whether communications between people or from electronic signals not directly used in communication. As
RAF Menwith Hill, a large site in the United Kingdom, part of ECHELON and the UKUSA Agreement in 2005
A German message intercepted by the British during World War II, signaling Germany's unconditional surrender
Zimmermann Telegram, as decoded by Room 40 in 1917
A Mark 2 Colossus computer. The ten Colossi were the world's first programmable electronic computers, and were built to break the German codes.
ECHELON
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ECHELON, originally a secret government code name, is a surveillance program operated by the five signatory states to the UKUSA Security Agreement: Australia, Canada, New Zealand, the UK and the Unite
Signals intelligence
…COINTELPRO ECHELON Foreign Intelligence Surveillance Act of 1978 Amendments Act of 2008…
A radome at RAF Menwith Hill, a site with satellite uplink capabilities believed to be used by ECHELON
Equipment at the Yakima Research Station (YRS) in the early days of the ECHELON program
Teletype operators at the Yakima Research Station (YRS) in the early days of the ECHELON program