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Re: From one of the Ultra Histories
All credit to Vice Admiral Erhard Maertens.
"a current reading of our messages is not possible," and " The acute disquiet about the compromise of our Secret Operation cannot be justified. Our cipher does not appear to be broken." 1941
"With the exception of two of three doubtful cases, enemy information about out the position of our U-boats appears so have been maintained mainly from extensive use of airborne radar, and the resultant plotting of these positions has enabled him [the enemy] to organize effective diversion of convoy traffic." Donitz after meeting with Maertens.
Vol IV: The Organisation and Evolution of British Naval Sigint. By Frank Birch.
Most of this volume describes the actual use of Special Intelligence material.
'...to avoid the pitfalls of of complacency (i), it is necessary to compare the handling and use of Sigint in the two World Wars ...'
(i) Example: 'The German brain is probably quite incapable of the imaginative and intuitive processes which 8E applied to Z material ... It is on these levels that intelligence becomes an art. Like architecture it escapes into a region above and beyond mathematics and logic'.
8E was a section of Hut 8 at BP, and Z material was German Enigma messages.
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