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From VENONA to PRISM: The Long History of NSA Secrecy

The secrecy around the NSA did not begin with PRISM, and it did not mean the same thing in every era. This entry follows the long arc from wartime cryptanalytic silence to Cold War institutional secrecy, post-Church legal containment, post-9/11 executive secrecy, and the modern leak era that finally made the surveillance system visible to the public.