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Vigenere coding is one of the most ancient forms of cryptography. In a Vigenere cipher, messages are encoded by mapping letters to numeric values and adding the plaintext values to the keytext values, modulo the number of letters in the alphabet.
Vigenere coding is one of the most ancient forms of cryptography. In a Vigenere cipher, messages are encoded by mapping letters to numeric values and adding the plaintext values to the keytext values, modulo the number of letters in the alphabet.
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in fact, it was not introduced by Blaise de Vigenere. In 1553, Giovan Batista Belaso introduced the idea of polyalphabetic substituion cipher, the same as Vigenere introduced in 1585. It is often miscalled Vigenere’s cipher but the original author is Belaso.