Titlebook: Decrypted Secrets; Methods and Maxims o Friedrich L. Bauer Book 20002nd edition Springer-Verlag Berlin Heidelberg 2000 Kryptanalyse.calculu

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Encryption Steps: Linear SubstitutionA linear (geometrically ‘affine’) substitution is a special poly graphic substitution. The injective encryption step of a polygraphic block encryption .with relatively large . and . is restricted in a particular way.

Meander

Composition of Classes of MethodsLet us recall that an encryption . : .* ⇢ .* is usually finitely generated by a cryptosystem . Let .* denote the set of all encryptions defined in this way by .. An encryption method . is a subset of .*. .. indicates the subset of periodic encryptions with period ., .. the subset of encryptions with non-computable keys.

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Anatomy of Language: PatternsLanguage contains an internal frame of regularities that are hard to extirpate. Particularly resistant are repeated patterns.

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https://doi.org/10.1007/978-3-663-09604-7s its elements. This is for . > 2 a severe restriction. Requiring moreover that in every row and in every column, one occurs just once and thus the elements are zero otherwise, leads to permutation matrices effectuating a mere permutation of the vector space basis.

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https://doi.org/10.1007/978-3-658-24268-8 used monoalphabetically—this was tacitly assumed in the examples. Genuine polyalphabetic encryption requires that the set . of available encryption steps has at least two elements, i.e., that the cryptoSystem . has at least the cardinality . = 2. For the frequent case .. , where . = |.|, the French literature speaks of a ..

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