CD-57

Opened CD-57

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.

Notes

↑ one website gives the production dates as "1956 and 1957" [1], another website says "first produced in 1957" "Cd-57 Handheld 6-Rotor Cryptographic Machine by Crypto Ag". Archived from the original on March 17, 2006. https://web.archive.org/web/20060317161354/http://www.gemmary.com/instcat/11/p25-214-11.html. Retrieved December 9, 2005. .
↑ [2]

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.