Alternative Entropy Sources

Question

Okay, I guess this is entirely subjective and whatnot, but I was thinking about entropy sources for random number generators. It goes that most generators are seeded with th

Answer 1

Noise on top of the Cosmic Microwave Background spectrum. Of course you must first remove some anisotropy, foreground objects, correlated detector noise, galaxy and local group velocities, polarizations etc. Many pitfalls remain.