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 51/8in × 31/8in × 11/2in (13 × 8 × 3.8cm) 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.

See also

• M-209

Notes

References

• Wayne G. Baker, Solving a Hagelin, Type CD-57, Cipher, Cryptologia, 2(1), January 1978, pp18.

• Louis Kruh, Cipher Equipment: Hagelin Pocket Cryptographer, Type CD-57, Cryptologia, Volume 1, 1977, pp255260.

• Geoff Sullivan, Cryptanalysis of Hagelin machine pin wheels, Cryptologia, 26(4), pp257273, October 2002.

External links

• Photographs and a simulator (Windows)

• Photographs of the CD-57: https://web.archive.org/web/20071008092722/http://www2.kulturprozent.ch/digitalbrainstorming/data/events/stuerzinger/image01.jpg, https://web.archive.org/web/20071008092838/http://www2.kulturprozent.ch/digitalbrainstorming/data/events/stuerzinger/image02.jpg, https://web.archive.org/web/20060602220446/http://www2.kulturprozent.ch/digitalbrainstorming/data/events/stuerzinger/image03.jpg

• Jerry Proc's pages: http://www.jproc.ca/crypto/cd57.html, http://www.jproc.ca/crypto/cd55.html

• Information about the STG-61