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Originally Posted by Mush Martin
all good but hinsley was at OIC not BP.
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Err, no:
At Bletchley Park, Hinsley studied the external characteristics of intercepted German messages, a process sometimes termed "traffic analysis": from call signs, frequencies, times of interception, and so forth, he was able to deduce a great deal of information about the structure of the German Navy's communication networks, and even about the structure of the German Navy itself.[3]
From the Wiki article about Harry Hinsley: http://en.wikipedia.org/wiki/Harry_Hinsley
He was the liason between Bletchley Park and the OIC at the Admiralty. Here is a quote, in his own words:
"I was pitchforked into Bletchley Park in October 1939 at the age of 20 and at the beginning of my third year at Cambridge, one of about twenty undergraduates who formed the first of the annual drafts of recruits with GC&CS took direct from the universities for the rest of the war."
F. H. Hinsley, "BP, Admiralty, and Naval Enigma" in "Code Breakers: The inside story of Bletchley Park" by F. H. Hinsley & Alan Stripp.