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Comment Re:The Horse is Already Gone (Score 1) 65

QCs are completely unsuitable for reversing hashes and that is what cracking passwords needs.

Translation: we don't currently have a quantum algorithm for reversing hashes. But there was a time, not that long ago, when we didn't have a quantum algo for factorization either. However, I don't expect to see a quantum algo for hash reversion any time soon, because the whole problem of reversing hashes is pretty complex.

Factorization as a classical problem is essentially trivial, in that there are very simple classical algorithms for it. They just take a lot of time to run. But coming up with an efficient quantum algorithm was not trivial, and the algorithm itself isn't so simple. So you can estimate that a quantum version of any algorithm is a lot more complex than the classical counterpart.

Comment Re: Mac OS has already started to pester me (Score 1) 65

"quantum resistant forever" is too strong.

I've only taken fairly general master's level courses in quantum information and regular cryptography, but I agree with this overall sentiment. My math professors used to say that no asymmetric encryption scheme has been proved unbreakable; we only know if they haven't been broken so far. Assuming something is unbreakable is like saying Fermat's last theorem is unprovable — until one day it's proved. So to me "post quantum cryptography" is essentially a buzzword.

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