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Bletchley Park and the Enigma
inch (Peter H.) wrote in
:
They explained how they broke the Japanese code.
The JN25 code was cracked by the Americans, at Pearl Harbor.
Perhaps a much lower level code, the Japanese Merchant's Code was
cracked at B.P.
The Brits had been cracking the Japanese codes since the expansionist
activities threatened Singapore and the like, some time around the mid to
late 30's. The JN codes changed frequently and JN25 was the latest of
many.
The Enigma cracking was made a lot easier when examples the three wheel
enigma machines got back to the UK early in the war. That's 1939/40 and
not '41... There where different machines, not just different wheel's for
different services. Admiral Canares suspected some of the uboat codes
where being broken, in fact most where, and implemented a 4 wheel Enigma
which caused loads of grief. In the end a destroyer captured a U Boat
intact , 4 Wheel enigma machine and all and accelerated the process. That
was a British Destroyer by the way, in early '41 before Pearl Harbor and
not as Hollywood and U-571 would have you believe.
Another interesting Turing fact is that he apparently had a lot to do
with working out improvements in the math side of Radar in working out of
of height, range, speed, size, profile and the like and also in helping
figure out the German use of radio for positioning, first thought to be
some kind of coded traffic to agents in Britain.
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