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Vigenère cipher
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===Vigenèreʼs autokey cipher=== Vigenère actually invented a stronger cipher, an [[autokey cipher]]. The name "Vigenère cipher" became associated with a simpler polyalphabetic cipher instead. In fact, the two ciphers were often confused, and both were sometimes called ''le chiffre indéchiffrable''. Babbage actually broke the much-stronger autokey cipher, but Kasiski is generally credited with the first published solution to the fixed-key polyalphabetic ciphers.
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