Other people have mentioned how it's done in practice but there have been recent advances on this on the theoretical front as well. Here's one I know of: https

Other people have mentioned how it's done in practice but there have been recent advances on this on the theoretical front as well. Here's one I know of: https://threatpost.com/academics-make-theoretical-breakthrough-in-random-number-generation/118150/ https://threatpost.com/academics-make-theoretical-breakthrou...