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Summary
| Description |
English: M-134 cipher machine, w:William F. Friedman's original design and the predecessor of the w:SIGABA. Note plugboard in upper left with five wires, one unplugged. These assigned the outputs of the control wheel maze to specific stepping solenoids and provided additional key variability. In SIGABA, also know as the ECM-II, the plugboard was replaced by five 10-pin rotors. |
| Date | |
| Source | https://www.nsa.gov/Portals/70/documents/about/cryptologic-heritage/historical-figures-publications/publications/technology/The_SIGABA_ECM_Cipher_Machine_A_Beautiful_Idea3.pdf?ver=2019-08-07-124409-850 The SIGABA/ECM II Cipher Machine: “A Beautiful Idea,” Center for Cryptologic History, National Security Agency |
| Author | Employee of U.S. government |
Licensing
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:45, 6 January 2020 | | 553 × 729 (557 KB) | ArnoldReinhold | User created page with UploadWizard |
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