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RAF Menwith Hill, a large site in the United Kingdom, part of ECHELON and the UKUSA Agreement. (2005)
The last German message intercepted by the British during World War II, signaling Germany's unconditional surrender

Signals intelligence (SIGINT) is intelligence-gathering by interception of signals, whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication (electronic intelligence—abbreviated to ELINT). Signals intelligence is a subset of intelligence collection management.

As sensitive information is often encrypted, signals intelligence often involves the use of cryptanalysis to decipher the messages. Traffic analysis—the study of who is signaling whom and in what quantity—is also used to derive information.


Signals intelligence sections
Intro  History  Technical definitions  Disciplines shared across the branches  COMINT  [[Signals_intelligence?section={{safesubst:#invoke:anchor|main}}Electronic_signals_intelligence|{{safesubst:#invoke:anchor|main}}Electronic signals intelligence]]  SIGINT versus MASINT  Legality  See also  References  Further reading  External links  

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