On Thu, Sep 5, 2013 at 9:18 PM, Peter Gutmann <pgut...@cs.auckland.ac.nz>wrote:
> >To say the same thing the other way, I was always amazed that the Nazis > were > >unable to figure out that their crypto was broken during WWII. There were > >experiments they could have done, such as sending out a few U-boats under > >strict radio silence and comparing their longevity to others. > > Cognitive dissonance. "We have been...", sorry "Ve haff been reassured zat > our cipher is unbreakable, so it must be traitors, bad luck, technical > issues, > ...". > As I recall the history it was direction finding (HF-DF) that was causing specific U-boats to be lost. Crypto was more global---resulting in rerouting convoys, etc. See https://en.wikipedia.org/wiki/High-frequency_direction_finding. After late '42 or so, U-boat radio silence would have indicated that using the radios was a problem---even during the time that the Naval Enigma was not being broken. -- Chuck ====================== Charles L. Jackson 301 656 8716 desk phone 888 469 0805 fax 301 775 1023 mobile PO Box 221 Port Tobacco, MD 20677
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