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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Wilberforce
You are in the right track. You don't need Aes or crypto.
What device do you intend the file system to be on? Are you going to wire up an sd card?
The file system has been ported on the esp32 to use flash memory - flashfs
If you have enough flash memory this could be an option. How big are your files?