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substitution cipher
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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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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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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 (?).
Codes, Secrets, and Ciphers Quiz