Spanish Enigma: A History of the Enigma in Spain by José Ramón Soler Fuensanta, Francisco Javier López-Brea Espiau, and Frode Weierud Author Posting. © Taylor & Francis Group, LLC, 2010. This is the author's version of the work. It is posted here by permission of Taylor & Francis Group, LLC for personal use, not for redistribution. The definitive version was published in Cryptologia, Volume 34, Issue 4, October 2010. DOI:10.1080/01611194.2010.485414 (http://dx.doi.org/10.1080/01611194.2010.485414). To cite this article: Fuensanta, José Ramón Soler, Espiau, Francisco Javier López-Brea and Weierud, Frode (2010) 'Spanish Enigma: A History of the Enigma in Spain', Cryptologia, 34: 4, 301−328. Page intentionally blank. Spanish Enigma: A History of the Enigma in Spain José Ramón Soler Fuensanta1, Francisco Javier López-Brea Espiau2, Frode Weierud3 ADDRESS: (1) C/ Aragón 100, 07800 Ibiza (Balearic Islands), Spain. Email:
[email protected] (2) C/ Vitruvio 1, 28006 Madrid, Spain. Email:
[email protected]. (3) Le Pre Vert, 1041 Rte de Mategnin, F-01280 Prevessin-Moens, France. Email:
[email protected], WWW: http://cryptocellar.org/ ABSTRACT: The presentation of a brief study of the use of Enigma Machines in Spain, during the Spanish Civil War (1936-1939) and later, until their final replacement. KEYWORDS: Enigma machine, Spanish Civil War, Spain. 1. Introduction The birth and commercialization of cipher machines represented a revolution in the history of cryptography. These machines provided greater security and strength to encryption systems, and at the same time avoided one of the main problems of manual ciphers, continuous errors in the process of encryption and decryption.