Aerofoil Sections: Results from Wind-Tunnel by Friedrich Wilhelm Riegels

By Friedrich Wilhelm Riegels

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The encryption step is said to be endomorphic if V = W . Speaking of homophones and variants (also optional substitutes, multiple substitutes) and of nulls (also dummies, French nonvaleurs, German Blender, Blindsignale, Trugchiffren), usually those of the encryption step are meant. If the cryptotext character set of the encryption step contains words of different length, the encryption step is called “straddling” (German gespreizt). A generated encryption is not necessarily injective, even if the generating encryption steps are: 6 Every x ∈ V ∗ is taken to be suitably filled up by meaningless symbols.

1 Vocabulary, character set. The set of characters, V , used to formulate the plaintext5 is called the plaintext vocabulary or plaintext character set. The set of characters, W , used to formulate the ciphertext or codetext is called the cryptotext vocabulary or cryptotext character set. The individual characters in W can also be logograms, special symbols representing a word or phrase, such as &, %, $, £, c ; moreover †, ‡, ¶, #, @ , ℘, , ℵ; and other symbols. V and W can be fully different, or overlapping, or identical sets.

9} . ¨ The (present-day) Cyrillic alphabet has 32 letters (disregarding E): Z32 = {A, B, V, G, D, E, , Z, I, I, K, L, M, N, O, P, R, S, T, U, F, H, C, Q, X, W, , Y, , , , }. Otherwise many different special conventions have been used to represent digits and, if necessary, punctuation marks and diacritic marks. 40 2 Aims and Methods of Cryptography Spaces between words are suppressed in professional cryptography. Even in German, where the words are longer than in most languages, word spacings are commoner than /e/.

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