The (Hagelin) CD-57 was a portable, mechanical cipher machine manufactured by Crypto AG, first produced in 1957.[1] 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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/CD-57-IMG_0540-0542-black.jpg/220px-CD-57-IMG_0540-0542-black.jpg)
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.[2]
Sullivan (2002) shows how the CD-57 can be attacked using a hill climbing search technique.
See also
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.
External links
![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
Wikimedia Commons has media related to CD-57.
- Photographs and a simulator (Windows)
- Photographs of the CD-57: [3], [4], [5]
- Jerry Proc's pages: [6], [7]
- Information about the STG-61
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