More Cold War Cloak-n-Dagger SIGINT History

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American Cryptology during the Cold War, 1945-1989, by Thomas R. Johnson: documents 1, 2, 3, 4, 5, and 6.

In response to a declassification request by the National Security Archive, the secretive National Security Agency has declassified large portions of a four-part "top-secret Umbra" study, American Cryptology during the Cold War. Despite major redactions, this history discloses much new information about the agency's history and the role of SIGINT and communications intelligence (COMINT) during the Cold War. Researched and written by NSA historian Thomas Johnson, the three parts released so far provide a frank assessment of the history of the Agency and its forerunners, warts-and-all.