Comment Re:Can someone help explain "perfect" randomness? (Score 2) 139
Lava lamps (like Cloudflare actually use as part of their RNG, IIRC) might be just as good, but mathematically proving that could be a little more challenging, and there may be any number of corner case effects, such as the temperature on either side of the glass or minute variations in the heating coils, that cause an almost imperceptable bias towards the denser coloured fluid in the lamp being in certain parts of the lamp than others for short periods of time.
As to whether we need this, quite probably not. However, TFS does propose use as a kind of "master clock" to regulate other systems that would be less precise (or random, in this case) on their own. Whether that's more cost effective or practical than just combining multiple sources of randomness together to get a single output data stream I guess will be determined by any users that really, really, need a truly random data stream, and how the realities of a post-quantum world eventually play out. If you are in some kind of situation where an adversary can keep retrying at a suitable rate and only needs to predict/guess the next in sequence correctly once to "win", then perfect randomness over a sufficiently large search area is something you are going to be all over.