Editing CD-57

{{Short description|Mechanical cipher machine}}
{{More footnotes|date=October 2008}}
[[File:CD-57-IMG 0540-0542-black.jpg|thumb]]
[[File:CD-57-IMG 0544.JPG|thumb|Opened CD-57]]
The '''(Hagelin) CD-57''' was a portable, mechanical cipher machine manufactured by [[Crypto AG]], first produced in 1957.<ref>one website gives the production dates as "1956 and 1957" [http://www.jproc.ca/crypto/cd57.html], another website says "first produced in 1957" {{cite web|url=http://www.gemmary.com/instcat/11/p25-214-11.html |accessdate=December 9, 2005 |url-status=dead |archiveurl=https://web.archive.org/web/20060317161354/http://www.gemmary.com/instcat/11/p25-214-11.html |archivedate=March 17, 2006 |title=Cd-57 Handheld 6-Rotor Cryptographic Machine by Crypto Ag }}<!--link is now broken, but as this is a reference I am keeping the text of the link--> <!-- Second link works as of 20-April-2006 -->.</ref> It was derived from the earlier '''CD-55''', and was designed to be compatible with the larger [[C-52 (cipher machine)|C-52]] machines. Compact, the CD-57 measured merely 5&nbsp;1/8in × 3&nbsp;1/8in × 1&nbsp;1/2in (13 × 8 × 3.8&nbsp;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.<ref>[http://www.gemmary.com/instcat/11/p23-203-11.html]  {{webarchive |url=https://web.archive.org/web/20041229131958/http://www.gemmary.com/instcat/11/p23-203-11.html |date=December 29, 2004 }}</ref>

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

==See also==
* [[M-209]]

==Notes==
<references />

==References==
* Wayne G. Baker, Solving a Hagelin, Type CD-57, Cipher, ''Cryptologia'', 2(1), January 1978, pp1&ndash;8.
* Louis Kruh, Cipher Equipment: Hagelin Pocket Cryptographer, Type CD-57, ''Cryptologia'', Volume 1, 1977, pp255&ndash;260.
* Geoff Sullivan, Cryptanalysis of Hagelin machine pin wheels, ''Cryptologia'', 26(4), pp257&ndash;273, October 2002.

==External links==
{{Commons category|CD-57}}
* [https://web.archive.org/web/20081012122703/http://cryptocellar.web.cern.ch/cryptocellar/simula/cd57/index.html 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]
* [https://web.archive.org/web/20060317161412/http://www.gemmary.com/instcat/11/p25-215-11.html Information about the STG-61]

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[[Category:Encryption devices]]