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The OMI cryptograph was a rotor cipher machine produced and sold by Italian firm Ottico Meccanica Italiana (OMI) in Rome. The machine had seven rotors, including a reflecting rotor. The rotors stepped regularly. Each rotor could be assembled from two sections with different wiring: one section consisted of a "frame" containing ratchet notches, as well as some wiring, while the other section consisted of a "slug" with a separate wiring. The slug section fitted into the frame section, and different slugs and frames could be interchanged with each other. As a consequence, there were a large number of permutations for the rotor selection. The machine was offered for sale during the 1960s.〔(【引用サイトリンク】title=Relatives of the Enigma )〕 ==References== * Cipher A. Deavours and Louis Kruh, "Machine Cryptography and Modern Cryptanalysis", Artech House, 1985, pp. 146–147 * F. L. Bauer, ''Decrypted Secrets'', 2nd edition, Springer-Verlag, 2000, ISBN 3-540-66871-3, pp. 112,136. 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「OMI cryptograph」の詳細全文を読む スポンサード リンク
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