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thumb The (Hagelin) CD-57 was a portable, mechanical cipher machine manufactured by Crypto AG, first produced in 1957.〔one website gives the production dates as "1956 and 1957" (), another website says "first produced in 1957" () .〕 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.〔() 〕 Sullivan (2002) shows how the CD-57 can be attacked using a hill climbing search technique. ==See also== * M-209 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「CD-57」の詳細全文を読む スポンサード リンク
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