Clock (cryptography)
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Chief
Gwido Langer German Section cryptologists
Marian Rejewski · Jerzy Różycki Henryk Zygalski · Antoni Palluth Wiktor Michałowski Chief of Russian Section
Jan Graliński Russian Section cryptologist
Piotr Smoleński |
| The Enigma cipher machine |
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In cryptography, the clock was a method devised by Polish mathematician-cryptologist Jerzy Różycki, at the Polish General Staff's Cipher Bureau, to facilitate decrypting German Enigma ciphers.
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[edit] Method
This method sometimes made it possible to determine which of the Enigma machine's rotors was at the far right, that is, in the position where the rotor always revolved at every depression of a key.[1]
Różycki's "clock" method was later elaborated by the British cryptologist Alan Turing at Bletchley Park in the development of a cryptological technique called "Banburismus."[2]
[edit] See also
[edit] Notes
- ^ Rejewski 1984, p. 290
- ^ Good 1993, p. 155
[edit] References
- Kozaczuk, Władysław (1984), Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two, edited and translated by Christopher Kasparek, Frederick, Maryland: University Publications of America, ISBN 978-0890935477 A revised and augmented translation of W kręgu enigmy, Warsaw, Książka i Wiedza, 1979, supplemented with appendices by Marian Rejewski
- Rejewski, Marian (1984), "The Mathematical Solution of the Enigma Cipher: Appendix E" of Kozaczuk 1984, pp. 272–91
- Good, Jack (1993), "Enigma and Fish", in Hinsley, F.H.; Stripp, Alan, Codebreakers: The inside story of Bletchley Park, Oxford: Oxford University Press, pp. 149–66, ISBN 978-0-19-280132-6
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