OMI cryptograph

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title: "OMI cryptograph" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["cryptographic-hardware", "rotor-machines"] topic_path: "general/cryptographic-hardware" source: "https://en.wikipedia.org/wiki/OMI_cryptograph" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::figure[src="https://upload.wikimedia.org/wikipedia/commons/b/b5/OMI-cryptograph.jpg" caption="The OMI cryptograph was a seven-rotor machine produced by Italian firm [[Ottico Meccanica Italiana]]."] ::

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 many permutations for the rotor selection.

The machine was offered for sale during the 1960s.

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, , pp. 112,136.

References

  1. "Relatives of the Enigma". quadibloc.com.

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cryptographic-hardwarerotor-machines