Ultra (cryptography)
Also known as: ULTRA program
Ultra was the designation adopted by British military intelligence in June 1941 for wartime signals intelligence obtained by breaking high-level encrypted enemy radio and teleprinter communications at the Government Code and Cypher School at Bletchley Park.
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Ultra (cryptography): John Cecil Masterman
Masterman himself wrote the book without revealing anything about Ultra, still highly secret, that greatly aided the double-cross system.
Ultra (cryptography): Operation Mincemeat, 1943
Forensic examination showed they had been read and Ultra decrypts of German messages showed that the Germans fell for the ruse.