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sigint

  
     
  ‘Signals intelligence’ is the intelligence activity which involves interception and decrypting of communications plus interpretation of the significance of emissions from such sources as radar installations. The former division of sigint is usually known as ‘communications intelligence’ and the latter as ‘electronic intelligence’. In Britain, Government Communications Headquarters (GCHQ) specializes in sigint; in the United States the task is performed by the National Security Agency (NSA). Sigint facilities are not unknown within diplomatic missions, while the communications of these missions have for long been a major target of sigint attack themselves. See also bubble; Echelon; freedom of communication; listening device.  
 

 

 

  
 
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