CD-57 explained
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.
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
- one website gives the production dates as "1956 and 1957" http://www.jproc.ca/crypto/cd57.html, another website says "first produced in 1957" Web site: Cd-57 Handheld 6-Rotor Cryptographic Machine by Crypto Ag . December 9, 2005 . dead . https://web.archive.org/web/20060317161354/http://www.gemmary.com/instcat/11/p25-214-11.html . March 17, 2006 . .
- http://www.gemmary.com/instcat/11/p23-203-11.html
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.
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