BetweenUsCrypt - Encrypt and D

BetweenUs is an application that provides an easy way for you to turn your messages and text into a format that can only be
returned into it's original form by a person with this application and the key that was used to encrypt it.

You can toggle on the use default key button if you want to use a secret default key by the app, this means that this same
toggle must be on whenever the encrypted message is to be decrypted.

Note that
* Emojis are not supported yet as of the current version.
* Empty lines might be replaced by the letter 'L'.