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

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Periodicity Examinationf keys in the period of the encryption. This is based on the following stationariness property of stochastic sources: If . is a plaintext (of length .) from a source ., then .(.), the plaintext . shifted cyclically by any number . of positions, is from the same source.

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Die soziale Organisation von MännlichkeitAmong 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.

Decongestant

Die Geschichte der MännlichkeitSimple (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.

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Die Wissenschaft von der MännlichkeitA 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.

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Trypsin

Wissen, Kommunikation und GesellschaftThe 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. In general, there are two possibilities:

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Franz Hamburger,Lydia Seus,Otto WolterLanguage contains an internal frame of regularities that are hard to extirpate. Particularly resistant are repeated patterns.

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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.