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Signals intelligence (SIGINT) is a book category centered on the interception, decryption, and analysis of communications and electronic emissions to produce intelligence. It spans histories of codebreaking and surveillance from World Wars and the Cold War to the digital age; examinations of agencies and programs; and contemporary coverage of cyber operations, satellite and radio monitoring, and electronic warfare, including subfields like COMINT (communications intelligence) and ELINT (electronic intelligence). The category includes technical primers on cryptography, traffic analysis, and signal processing; memoirs and case studies from practitioners; and policy, legal, and ethical analyses of secrecy, oversight, and privacy. It also encompasses narrative nonfiction and fiction thrillers that dramatize interception, decoding, and high-stakes intelligence operations in historical and modern settings.

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