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Did they really capture an enigma machine, or was it the computer at Bletchley Park ???
Actually virtually all the Enigma secrets are now in the public domain. The Polish secret service obtained one in 1939, before the invasion. When Germany invaded, it was smuggled out to Britain. Without knowing how the machine worked, the whole operation at Bletchley Park would have been impossible. Moreover, in order to set the "bombes" which did the actual cracking, the Bletchley Park staff needed to isolate the setting codes at the start of each message.
Curiously enough, the Enigma was not primarily designed for military applications, it was intended as a commercial coding machine to prevent industrial espionage. However the German military recognised it's potential. They continued to believe it secure until the end of the war, preferring to believe that their highest echelons were penetrated by Soviet spies.
It is now known that Bletchley Park & SIS generally, were compromised by Soviet agents (Burgess, McLean, Philby etc). Moreover it has been speculated lately that Bletchley Park was also monitoring Soviet transmissions & possibly other allies.