Being affected by noise doesn't mean you get a source of noise that has the particular properties you want (namely, not compressible / not predictable in a stat

Being affected by noise doesn't mean you get a source of noise that has the particular properties you want (namely, not compressible / not predictable in a statistical fashion). You can take 'bad' sources of noise and make them better, but these generally require a fair bit of math [1] and can be costly to implement. At that point, why not just use a PRNG a la urandom? [1] https://en.wikipedia.org/wiki/Randomness_extractor https://en.wikipedia.org/wiki/Randomness_extractor