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Yeah, from the requirements it’s not clear why you wouldn’t just use TLS.

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.

You're right. I wanted to abstract away from specific hardware and express that in the requirements. I definitely failed at that. See other comments for specifics and details on the device.

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