Schlüsselgerät 39

The Schlüsselgerät 39 (SG-39) was an electrically operated rotor cipher machine, invented by the German Fritz Menzer during World War II. The device was the evolution of the Enigma rotors coupled with three Hagelin pin wheels to provide variable stepping of the rotors. All three wheels stepped once with each encipherment. Rotors stepped according to normal Enigma rules, except that an active pin at the reading station for a pin wheel prevented the coupled rotor from stepping. The cycle for a normal Enigma was 17,576 characters. When the Schlüsselgerät 39 was correctly configured, its cycle length was characters, which was more that 15,000 times longer than a standard Enigma. The Schlüsselgerät 39 was fully automatic, in that when a key was pressed, the plain and cipher letters were printed on separate paper tapes, divided into five-digit groups.[1][2][3] The Schlüsselgerät 39 was abandoned by German forces in favour of the Schlüsselgerät 41.

Bibliography
  • "TICOM I-137 Final report written by Wachtmeister Otto Buggisch of OKH/Chi and OKW/Chi" (pdf). Google drive. TICOM. 8 October 1945. Retrieved 12 September 2018.

References
  1. Mowry, David P (1983). "Regierungs-Overinspektor Fritz Menzer: Cryptographic Inventor Extraordinaire" (PDF). nsa.gov. Document ref:2757002. Cryptologic Quarterly, Vol. 2, Nos. 3-4; autumn/winter 1983-84. pp. 21–36. Retrieved 30 January 2016. This article incorporates text from this source, which is in the public domain.
  2. Klaus Schmeh (2008). Codeknacker gegen Codemacher: die faszinierende Geschichte der Verschlüsselung ; [Sachbuch]. W3l GmbH. p. 223. ISBN 978-3-937137-89-6.
  3. Michael Smith (20 January 2011). The Bletchley Park Codebreakers. Biteback Publishing. p. 339. ISBN 978-1-84954-623-2.
  4. "I-137 Final report written by Wachtmeister Otto Buggisch of OKH/Chi and OKW/Chi". Google drive. TICOM. 8 October 1945. Retrieved 3 February 2018.
  5. I-137 p.2
  6. I-137 p.3
  7. I-137 p.4
  8. I-137 p.5
  9. I-137 p.6
  10. I-137, p.7
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