Encode and decode a message with a vername cipher (or one-time pad).
In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a single-use pre-shared key that is no smaller than the message being sent. In this technique, a plaintext is paired with a random secret key (also referred to as a one-time pad). Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using modular addition. Read more on wikipedia
vernam encrypt HELLO WMCKL # Outputs DQNVZvernam decrypt DQNVZ WMCKL # Outputs HELLO