It's been a very long time since I've looked at doing anything like this manually. I just tried it using the details found here and even though the tutorial specifies that the key phrase should be the same length, repeating the key phrase again and again lets you do longer messages.
Not sure my 6 year old will get it but I'm gonna put a list of messages together using a few different techniques and will see if she can unscramble them on the weekend.
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