The term "Ultra" has often been used almost synonymously with " Enigma decrypts". Used properly, the German military Enigma would have been virtually unbreakable in practice, shortcomings in operation allowed it to be broken. Much of the German cipher traffic was encrypted on the Enigma machine. used the codename Magic for its decrypts from Japanese sources, including the " Purple" cipher. Information obtained through code-breaking was often attributed to the human intelligence from the Boniface network.
In order to ensure that the successful code-breaking did not become apparent to the Germans, British intelligence created a fictional MI6 master spy, Boniface, who controlled a fictional series of agents throughout Germany.
The code name Boniface was used as a cover name for Ultra. Several other cryptonyms had been used for such intelligence. The name arose because the intelligence 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. Ultra eventually became the standard designation among the western Allies for all such 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 (GC&CS) at Bletchley Park.
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