Gulf of Tonkin SIGINT history
NSA declassified over 140 documents; an agency historian's study argues the SIGINT shows a reported second attack on 4 August 1964 did not occur.
National Security Agency
United States · founded 1952 · US signals-intelligence and cybersecurity agency.
Episode: CLASSIFIED — COMING SOON
Section: United States
Case files (3): GCHQ “Tempora” and the Big Brother Watch ruling · Bundestag NSA inquiry: BND selectors and monitoring of allies · Gulf of Tonkin SIGINT
Leaks (6): Snowden: the PRISM slides · Snowden: the NSA's bulk phone-records order · Shadow Brokers and the Equation Group tools · NSA memo on Russian hacking (Reality Winner) · Operation Triangulation and the FSB's claim · US documents on Israel's planned strike on Iran
Documented items (3)
VENONA decrypts
US agencies released translations of encrypted 1940s Soviet KGB and GRU messages; the first 49 messages concerned espionage against the atomic bomb program.
ACLU v. Clapper: bulk phone-records program
The Second Circuit held that Section 215 of the Patriot Act did not authorize the bulk telephone metadata program; it did not decide the constitutional question.