Ciphers in War 2

Here's some vocabulary you may need to understand the passage on the next page: cipher - noun: A note written in a secret code.   telegraph - noun: A device used to send a message at a distance over a wire (usually in Morse code).   message - noun: A note to a person, usually brief and written.   key - noun: Something important for explaining.   variation - noun: Something changed a little bit.   cryptography - noun: The act of writing in code or cipher.