This is a simple message encrypter made using the cryptography module. It encrypts the message with a special key and it can only decrypt that message with the same key.
gen_key() Creates a key and saves it to a file call key.txt
get_key() and get_msg() both read their respective files and get the message/key inside them and returns them
encrypt(get_key()) Asks you for a message, and uses the key to encrypt the message. Then it saves the message to a file.
decrypt(get_key(), get_msg()) Gets encrypted message and key and uses key to decrypt the message.