CD-57

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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 and weighed 1.5 pounds. 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 [1].

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

Contents 1 Notes 2 See also 3 References 4 External links

[edit] Notes

(1) — one website gives the production dates as "1956 and 1957" [2], another website says "first produced in 1957" [3].

[edit] See also

• M-209

[edit] 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.

[edit] External links

• Photographs and a simulator (Windows)
• Photographs of the CD-57: [4], [5], [6]
• Jerry Proc's pages: [7], [8]
• Information about the STG-61

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