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This. Even if TLS is the wrong answer, it will always be better than anything you roll yourself.

Shout out to https://www.trustedfirmware.org/projects/mbed-tls/

Thanks for the feedback. See also comment https://news.ycombinator.com/item?id=39834820 Note that this device is general purpose security device with no persistence. So the requirements were really specific for that reason.

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