Title: National Security Agency releases history of cold war intelligence activities
Description: 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.
Subjects: Military intelligence, History, Cryptography, Electronic surveillance, Official secrets, Cold War, United States. National Security Agency, United States
Places: United States
Time periods: 20th century