SIGINT
 SIGINT    | |
|---|---|
 Journalist Duncan Campbell pictured at eavesdropping base RAF Menwith Hill | |
| Interest of | Hans van de Ven |
SIGINT or Signals intelligence is intelligence-gathering by interception of signals, whether communications between people COMINT or communications intelligence or from electronic signals not directly used in communication ELINT or electronic intelligence.
As sensitive information is often encrypted, signals intelligence in turn involves the use of cryptanalysis to decipher the messages. Traffic analysis—the study of who is signalling whom and in what quantity—is also used to derive information.[1]
