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The Vigenere cipher is a polyalphabetic cipher based on using
successively shifted alphabets, a different shifted alphabet for
each of the 26 English letters. The letters of the keyword determine
the shifted alphabets used in the encoding process.
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The Vigenere was invented several hundred years ago by a French
cryptographer, Blaise de Vigenère.
Vigenere-like substitution ciphers were regarded by many as
practically unbreakable for 300 years, and it was popular for
encoding sensitive data for transmission over the telegram
system during the 19th century.
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