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How to use it:
You set a password, and put in a message. If you hit "encode" you get a bunch of gibberish. You (or the intended recipient). can then take this gibberish, paste it into the app, type in the same password, and get back that same original message.
The message (decoded or encoded) can be sent using the "Send Message" button through almost any social media service, sent to the clipboard to be pasted later, sent through email, or bluetooth.