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.
National Security Agency
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The National Security Agency is an intelligence agency of the United States Department of Defense, under the authority of the director of national intelligence. The NSA is responsible for global monit
NSA headquarters building in Fort Meade, Maryland, c. 1986
Black Chamber cryptanalytic work sheet for solving Japanese diplomatic cipher, 1919
Protesters against NSA data mining in Berlin wearing Chelsea Manning and Edward Snowden masks
Intercepted packages are opened carefully by NSA employees.