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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" [http://www.gemmary.com/instcat/11/p25-214-11.html]{{Dead link|date=October 2008}}<!--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 &times; 3&nbsp;1/8in &times; 1&nbsp;1/2in (13 &times; 8 &times; 3.8&nbsp;cm) and weighed 1.5 pounds (680 gr). The CD-57 used six wheels.
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" [http://www.gemmary.com/instcat/11/p25-214-11.html]{{Dead link|date=October 2008}}<!--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 &times; 3&nbsp;1/8in &times; 1&nbsp;1/2in (13 &times; 8 &times; 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] {{Dead link|date=October 2008}}</ref>
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] {{wayback|url=http://www.gemmary.com/instcat/11/p23-203-11.html |date=20041229131958 }}</ref>


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

Revision as of 09:30, 10 January 2016

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.

See also

Notes

  1. ^ one website gives the production dates as "1956 and 1957" [1], another website says "first produced in 1957" [2][dead link] .
  2. ^ [3] Template:Wayback

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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