Analysis of Giouan Battista Bellaso’s cipher challenges of 1555

  title={Analysis of Giouan Battista Bellaso’s cipher challenges of 1555},
  author={Norbert Biermann},
  pages={381 - 407}
ABSTRACT In his book, Noui et singolari modi di cifrare, Giouan Battista Bellaso presented 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 that 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… 
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