· d · e Enigma machine out of its wooden box Lorenz SZ42 machine with covers removed Part of Japanese PURPLE machine Three cipher machines that were broken by the Allies to yield Ultra intelligence 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. "Ultra" eventually became the standard designation among the western Allies for all such intelligence. The name arose because the intelligence thus obtained was considered more important than that designated by the highest British security classification then used (Most Secret) and so was regarded as being Ultra secret. Several other cryptonyms had been used for such intelligence. British intelligence first designated it "Boniface"—presumably to imply that it was the result of human intelligence. The U.S. used the codename "Magic" for its decrypts from Japanese sources..