Campos Fernández, Francisco Alberto
Gascón González, Alberto
Latorre Canteli, Jesús María
Soler Fuensanta, J. Ramón
2016-01-15T11:16:37Z
2016-01-15T11:16:37Z
13/01/2013
0161-1194
http://hdl.handle.net/11531/5004
Artículos en revistas
This article describes the application of modern algorithms to crack the official encryption method of the Spanish Civil War: the Strip Cipher. It shows the differences in efficiency and effectiveness between a genetic algorithm and mathematical programming, the optimisation methods known collectively as mathematical optimisation. Unlike the genetic algorithm, the programming approach has been seen to lead to high computational costs or to non-legible plain texts, which make it impractical. To improve the search for the genetic operators used, a dictionary is applied to identify possible words in each partially decrypted text and, thus, unblock the process. Results and conclusions have been obtained by analysing the outcome of the algorithms when attacking real ciphertexts found in the General Archive of the Spanish Civil War in Spain. Both the mathematical programming and the genetic algorithm approaches have merit, but the latter has considerable practical advantages.
application/pdf
en-GB
Revista: Cryptologia, Periodo: 1, Volumen: 37, Número: 1, Página inicial: 51, Página final: 68
Genetic algorithms and mathematical programming to crack the spanish strip cipher
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/restrictedAccess
genetic algorithms, mathematical programming, poly-alphabetic substitution cipher, Spanish Civil War, Strip Cipher