Titlebook: Decrypted Secrets; Methods and Maxims o Friedrich L. Bauer Book 20023rd edition Springer-Verlag Berlin Heidelberg 2002 Kryptanalyse.Kryptog

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勤勉

Die Arzneizubereitungen des D. A.Among the encryption steps we find prominently two large classes: substitution and transposition. They are both special cases of the most general encryption step .. → ... We shall start by looking at several kinds of substitution and turn our attention to transposition in Chapter 6.

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https://doi.org/10.1007/978-3-662-43014-9A linear (geometrically ‘affine’) substitution is a special polygraphic substitution. The injective encryption step of a polygraphic block encryption.with relatively large . and . is restricted in a particular way.

漂亮

https://doi.org/10.1007/978-3-642-91144-6Monoalphabetic encryption uses some encryption step (possibly a polygraphic one) over and over. All the encryption steps treated in Chapters 3–6 can be used monoalphabetically—this was tacitly assumed in the examples.

Ebct207

R. P. Meyer Dr. med.,F. Moro Dr. med.The polyalphabetic encryption methods discussed so far use a key for encryption and a key for decryption. Crypto systems with self-reciprocal encryption steps use the same key for both, of course.

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Regurgitation

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Encryption Steps: Polygraphic Substitution and CodingSimple (monographic) substitution requires a complete decomposition of the plaintext in single characters. A polygraphic substitution allows polygraphic encryption steps, i.e., encryption steps of the form .. → .. with . > 1.

搜集

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