Elizebeth Smith Friedman’s recovery of the wiring of two rotors from an enigma D machine
Department or Administrative Unit
Mathematics
Document Type
Article
Publication Date
9-21-2022
Journal
Cryptologia
Abstract
In January 1940, the U.S. Coast Guard intercepted numerous messages that were encrypted on a commercial Enigma D machine using the same key. By solving these messages in depth and examining the resulting cipher alphabets for each position of the rotors, the Cryptanalytic Unit, headed by Elizebeth Smith Friedman, was able to recover the wiring of two of the rotors. This paper explains Friedman’s methods in detail and uses them to determine the wiring of two rotors from an Enigma M3 machine.
Recommended Citation
Boersma, S. (2022). Elizebeth Smith Friedman’s recovery of the wiring of two rotors from an enigma D machine. Cryptologia, ahead of print, 1–25. https://doi.org/10.1080/01611194.2022.2109944
Comments
This article was originally published in Cryptologia. The full-text article from the publisher can be found here.
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