Polyalphabetic Encryption: Families of Alphabets
Monoalphabetic encryption uses some encryption step (possibly a polygraphs one) over and over. All the encryption steps treated in Chapters 3–6 can be used monoalphabetically—this was tacitly assumed in the examples. Genuine polyalphabetic encryption requires that the set M of available encryption steps has at least two elements, i.e., that the cryptoSystem M has at least the cardinality θ = 2. For the frequent case θ = N , where N = |V|, the French literature speaks of a chiffre carré.
KeywordsCyclic Permutation Cycle Decomposition Additional Rotor Rotor Encryption Encryption Step
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- 2.Marquis Gaëtan Henri Läon de Viaris, 1847–1901, French cryptologist. De Viaris invented in about 1885 one of the first printing cipher machines—according to Kahn, the very first were invented presumably before 1874 by Émile Vinay and Joseph Gaussin.Google Scholar