1) import into your Item list one of the coded scrolls from Augury of Chaos
2) open the item, click on the Random Code button to randomise the code.
3) replace the item’s text with your text
4) click on the item’s New Script button to create the attached script
5) once in the script editor, you can import the script of one of the coded scrolls. It’s not very complicated, you just need a dialogue asking the player if he/she wants to decode the message now, and if yes there’s a script command that will display the decoding interface associated with your item. Once the player has finished decoding, there’s a variable that is set, which you can check after the script command that displays the decoding interface. If it’s decoded, remove the item from the party’s inventory. At that point, you may want to give the player another version of the item which is the same thing but without the ‘coded message’ item type.,
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As mentioned above, I created two items for the journal I wanted decoded. One has the secret message, which is what the players find and have to use to bring up the interface. And then that item gets replaced by the fully decoded book once the message is solved. Here is a sample screenshot, which will be part of the new adventure I'm working on:
