A polyalphabetic substitution cipher that is a variant of the Caesar cipher.

The Vigenère cipher is a polyalphabetic substitution cipher that is a variant of the . Instead of replacing every character with its kth successor (with a single fixed k being the key), the Vigenère cipher uses a repeating sequence of period L, so that characters are shifted by k1, k2, k3, …, kL, k1, k2, k3, ….

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