substitution cipher: Quick Facts

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Figure 1: Relative frequency of occurrence of letters in this section and hence in any simple substitution cipher of the text and in a Playfair cipher.

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Vigenère cipher Vernam-Vigenère cipher Caesar cipher Playfair cipher cipher Data Encryption Standard public-key cryptography transposition cipher product cipher

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cryptology: Substitution ciphers

A botanical illustration from the Voynich manuscript, a codex, scientific or magical text in an unidentified language, in cipher; end of the 15th or during the 16th century (?).

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