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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.
@Stevie
I also think that Blowfish is a very good cipher. Fast, low resource requirements. And coming from a very well known and reliable source. There are many free implementations in all kinds of languages:
https://www.schneier.com/blowfish-download.html