The method used to generate the digits, a pair of 555 timers sending pulses through linear-feedback shift registers, would at best be considered pseudo-random.

For that you’ll need a true random number generator (RNG), and this open-source hardware RNG uses one of the better methods we’ve seen.

Using a single laser, scientists have built a new system that generates random numbers fast and at scale.

That’s exactly how the world’s only commercially available quantum random number generator works. But its speed is limited to about one megabit per second.