Spanish Enigma: A History of the Enigma in Spain

Abstract

The presentation of a brief study of the use of Enigma Machines in Spain, during the Spanish Civil War (1936)(1937)(1938)(1939) and later, until their final replacement.

Revealing Secrets in Two Wars: The Spanish Codebreakers at PC Bruno and PC Cadix

“…'s cryptographic service did not portray him in an especially favourable light, 21 seems to have done his job well. Although the use of the Enigma machines in the Spanish Civil War is well documented [7,27,29,30], we have no evidence that the republican side was aware of their existence, nor that their decryption was an objective of the S.I.E.M. personnel.…”

“…He decided, however, to stay in France, although we have no knowledge of what his companions eventually did. He lived in Paris 30 where he worked for the French Foreign Office, officially as a translator, although his real job (according to his nephew) was as a decryption expert for the Hispano-American area. As well as this, at least between 1956 and 1958, he presided over the National Council of the Security Corps of the Spanish Republic.…”

On weak rotors, Latin squares, linear algebraic representations, invariant differentials and cryptanalysis of Enigma

“…Our conventions and notation are consistent with all major Enigma simulators such as https://cryptii.com/pipes/enigma-machine and with 100 % of modern works on Enigma, cf. cryptomuseum.com, various wikipedia pages, [28], etc. We recall the Enigma the fast rotor is on the right side and it rotates anti-clockwise when we look from the right side.…”