| 1 | """Vigenère Cipher, by Al Sweigart al@inventwithpython.com |
| 2 | The Vigenère cipher is a polyalphabetic substitution cipher that was |
| 3 | powerful enough to remain unbroken for centuries. |
| 4 | More info at: https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher |