Revise the encryption program in Section 6.3.4 in the following manner: Create an encryption key consisting of multiple characters. Use this key to encrypt and decrypt the plaintext by XORing each character of the key against a corresponding byte in the message. Repeat the key as many times as necessary until all plain text bytes are translated. Suppose, for example, the key were equal to "ABXmv#7". This is how the key would align with the plain text bytes: