[libre-riscv-dev] [Bug 309] investigate OpenTITAN

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=309

--- Comment #2 from Jacob Lifshay <programmerjake at gmail.com> ---
If we can get away with using a few op-amps, I quite like the infinite noise HW
entropy source:
https://github.com/waywardgeek/infnoise

See also:
https://github.com/alwynallan/redoubler

I've built a similar circuit on a breadboard before and it works quite well,
though didn't test the entropy quality since I didn't connect it to a computer.

It has the nice features of not being finicky (unlike quite a lot of other
entropy sources) as well as not breaking down when there is a lot of
environmental noise (perhaps from an attacker).

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