alt Hacker NewsMany years ago I used to work for a company in the gambling domain. There was a story going around from years before I joined that hardware TNRGs where used. And one day they failed. I can't remember precisely but heat was involved in one way or another and the failure mode they encountered was caused by overheating and repeatedly giving an endless series ones. A switch to PNRGs was promptly introduced.
Thanks, this is a great story to illustrate why there's almost never any advantage to using a TRNG over a cryptographic-strength PRNG. That's also why Linux removed the blocking RNG from the kernel; there was no attack model where it gave more security.
Of course, PRNGs should still be seeded with real entropy from the outside world, but even if that fails at some point, your PRNG will still be producing effectively unpredictable numbers for a long time.