On 4/18/20 1:58 PM, Bernd Fix wrote: > On 4/18/20 11:24 AM, Jeff Burdges wrote: >> As an aside, there is a verifiable delay function (VDF) project by >> the ethereum foundation, which protect against parallelism. I’d >> expect VDFs provide less protection against ASICs per se than Argon2, >> but they should ideally provide relatively high confidence in ASIC >> speed. VDFs should only consume one core while running, which might >> improve user experience. We can chat about this once some VDF >> achieves the desired confidence in ASIC speed. ;) > > Actually something like VDF would be much better than a PoW in the > context of revocation. I was trying to find something along the same > lines (PoET, proof-of-elapsed-time) but to no avail.
I disagree that a VDF would be useful here. We want the PoW to be _costly_. With a VDF, I could generate 1 billion keys, then wait for a decade of delay, and then flood the network repeatedly to DoS it. Bad. Similarly, I could NOT deploy a key, find out I urgently need to revoke it and then just put in the resources make that happen. I may have to wait a year! So VDF is the _wrong_ primitive here.
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