CD-57

Quality 0.50 · 1 view · Updated 2 months ago

Mechanical cipher machine

title: "CD-57" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["encryption-devices"] description: "Mechanical cipher machine" topic_path: "general/encryption-devices" source: "https://en.wikipedia.org/wiki/CD-57" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Mechanical cipher machine ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/6/6f/CD-57-IMG_0540-0542-black.jpg"] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/f/f4/CD-57-IMG_0544.JPG" caption="Opened CD-57"] ::

The (Hagelin) CD-57 was a portable, mechanical cipher machine manufactured by Crypto AG, first produced in 1957. It was derived from the earlier CD-55, and was designed to be compatible with the larger C-52 machines. Compact, the CD-57 measured merely 5 1/8in × 3 1/8in × 1 1/2in (13 × 8 × 3.8 cm) and weighed 1.5 pounds (680 gr). The CD-57 used six wheels.

A variant is the CD-57(RT), a similar device using a one-time pad system rather than rotating wheels. The STG-61 was a licensed copy of the CD-57 by Hell.

Sullivan (2002) shows how the CD-57 can be attacked using a hill climbing search technique.

Notes

References

  • Wayne G. Baker, Solving a Hagelin, Type CD-57, Cipher, Cryptologia, 2(1), January 1978, pp1–8.
  • Louis Kruh, Cipher Equipment: Hagelin Pocket Cryptographer, Type CD-57, Cryptologia, Volume 1, 1977, pp255–260.
  • Geoff Sullivan, Cryptanalysis of Hagelin machine pin wheels, Cryptologia, 26(4), pp257–273, October 2002.

References

  1. "Cd-57 Handheld 6-Rotor Cryptographic Machine by Crypto Ag".
  2. [http://www.gemmary.com/instcat/11/p23-203-11.html] {{webarchive. link. (December 29, 2004)

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

encryption-devices