Analysis of Giovan Battista Bellaso’s Cipher Challenges of 1555
- This is an Accepted Manuscript of an article published by Taylor & Francis in Cryptologia on 12 Feb 2018. Abstract: In his book ‘Noui et singolari modi di cifrare’, Giovan Battista Bellaso presents to his readers three challenge ciphertexts. Two of them are based on a polyalphabetic cipher with a mixed primary reciprocal alphabet and a long key, whereas the third one uses four independent homophonic substitution alphabets which change after each word. A successful approach to solving these ciphers, to which Bellaso gave the name ‘terzo modo’ and ‘quarto modo’, performs a simulated annealing attack directly on the primary alphabet respectively the four homophonic alphabets at once. This paper focusses on the various applied fitness functions. The solutions for the ciphertexts are given and finally discussed, with a view toward the possibility of a hidden message within the plaintexts.
Verfasserangaben: | Prof. Norbert BiermannORCiD |
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URN: | urn:nbn:de:kobv:b170-12967 |
DOI: | https://doi.org/10.25624/kuenste-1296 |
Übergeordnetes Werk (Englisch): | Cryptologia |
Dokumentart: | Arbeitspapier |
Sprache: | Englisch |
Datum der Veröffentlichung (online): | 20.06.2020 |
Datum der Erstveröffentlichung: | 08.07.2020 |
Veröffentlichende Institution: | Universität der Künste Berlin |
Datum der Freischaltung: | 08.07.2020 |
Freies Schlagwort / Tag: | fitness function; homophonic substitution; polyalphabetic substitution; simulated annealing Giovan Battista Bellaso |
GND-Schlagwort: | KryptologieGND |
Seitenzahl: | 34 |
DDC-Klassifikation: | 7 Künste und Unterhaltung / 70 Künste / 700 Künste; Bildende und angewandte Kunst |
Lizenz (Deutsch): | ![]() |