John Cairncross - the man who made Soviet victory at Kursk Possible

Discussion in 'Top Secret' started by Jedburgh22, Jan 25, 2015.

  1. geoff501

    geoff501 Achtung Feind hört mit

    In the event of loss of capture of machines or code books, a reserve hand cipher was used, possibly Doppelkastenschlüssel.
    We found evidence of this from the batch of original messages from 1941 on the eastern front. Some message forms were a different cipher, possibly Doppelkastenschlüssel, unlike the Enigma we were not able to break these by computer. They were very short. Rejewski, who worked on this cipher while in England, said a minimu of 1000 characters on the same key was needed for a comfortable break.
     
  2. Over Here

    Over Here Junior Member

    Period 43/44:
    And most crucially on Kursk:
    And his assessment:
    Captured machines would help. Captured keys however would not allow later traffic to be read without cryptanalysis, since the keys would be changed. There appears to be no evidence this happened, unless you have other sources contradicting Christos.

    All the best

    Andreas


    If machines were captured it is quite likely that operators and documentation, even records were captured with them. Having captured machines the NKVD would immediately go looking among the PoWs for those who used them. Their methods of information extraction were probably successful when they found those men.
     

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