The commercial enigma: Beginnings of machine cryptography
A brief history and description of the first four models of the Enigma cipher machine, designed for the commercial market, taken in part from the authors' book . © 2002, United States Military Academy., All rights reserved.
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Kruh, Louis and Deavours, Cipher, "The commercial enigma: Beginnings of machine cryptography" (2002). Kean Publications. 2726.