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I’m familiar with this. However, as a cryptographer, seeding a PRG with the output of a good PRG is also good enough. In any case, you can seed with RDSEED. Maybe the idea for someone who doesn’t want to run their own PRG????
Intel's idea was that yes, you can just pull randomness straight out of RDRAND instead of seeding something else. Not a lot of people used it like that, but some did.
Seems like it’s time to put RDRAND out to pasture and just use RDSEED
What makes you think RDSEED doesn't go through the exact same bus and have all the same problems?
Intel's RDRAND is internally CTR_DRBG running AES-128 so you can't get more than 128 bits of secret entropy out of it until you exhaust a reseed counter (I've seen 64kB used). That's why RDSEED exists; you get actual entropy out of it, not just "seed expansion".
(AMD's documentation states CTR_DRBG with AES-256 btw and a different kind of ring oscillator circuit.)
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