[Cryptography] TRNG review: Arduino based TRNGs

[Stephen Wood]

> assuming we could use the PWM to force A0 to a value that keeps randomly
flipping between 0x200 and 0x1FF, by using an RC filter on the PWM
connected through a resistor to A0.

Interesting. Wouldn't such a circuit still exhibit a bias and variance
between units that required whitening? Could that be accomplished so that
each Arduino/IoT-stick was able to generate random data without additional
software?
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