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 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 [http://www.gemmary.com/instcat/11/p23-203-11.html] .

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

Notes

(1) — one website gives the production dates as "1956 and 1957" [http://www.jproc.ca/crypto/cd57.html] , another website says "first produced in 1957" [http://www.gemmary.com/instcat/11/p25-214-11.html] .

ee also

* M-209

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://www.hut-six.co.uk/cd57/index.html Photographs and a simulator (Windows)]
* Photographs of the CD-57: [http://www2.kulturprozent.ch/digitalbrainstorming/data/events/stuerzinger/image01.jpg] , [http://www2.kulturprozent.ch/digitalbrainstorming/data/events/stuerzinger/image02.jpg] , [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]
* [http://www.gemmary.com/instcat/11/p25-215-11.html Information about the STG-61]

CD-57 is also a NK (natural killer) cell found in the blood. This cell is known to be supressed by the presence of the Lymes disease organism "Borrelia burgdorferi". There is a hemetology test used to quantify the amounts of CD-57 in the blood to determine if this organism is active. Generally a score of less than 20 is indicative of highly active Lymes disease, where a score of over 200 is considered normal, or no activity.

(I would ask that someone more versed in this information please edit this, as this information should be included with the key words CD-57)

see [http://www.anapsid.org/lyme/strickerpanel.html] for a laymans explanation.