For those wondering how I managed to encrypt these messages, I used this website:
http://codebeautify.org/encrypt-decrypt
You can also use it to decrypt the messages, it’s all on normal settings so you don’t need to change anything.

Again, the keys are hidden within the game, and again won’t say when and where in the game they are at. I will only give small hints. ;)

Edit: Speaking of which, just added the hint on the 5th message. Sorry for forgetting guys! xc