Vigenère decypher function
Returns the decoding of aStr after applying the Vigenère decypher with the key aKey. aStr is supposed to be a string composed uniquely from a-z characters, and aKey is a string composed uniquely from a-z characters.
aStr
aKey
a-z
the string to decypher
the key to use for the Vigenère decypher
the decyphered string
Vigenère decypher function
Returns the decoding of
aStrafter applying the Vigenère decypher with the keyaKey.aStris supposed to be a string composed uniquely froma-zcharacters, andaKeyis a string composed uniquely froma-zcharacters.