[oconnore]

256 bit symmetric cryptography keys are a bit like picking one atom in the universe (10^80 atoms, or 100000000000000000000000000000000000000000000000000000000000000000000000000000000). Your opponent would have to test half of the atoms in the universe to have a reasonable chance of getting the right key.

That's generally understood to be not feasible.

[alwayslikethis]

https://www.schneier.com/blog/archives/2009/09/the_doghouse_...

It's more than that. Simply incrementing your way through a 256 bit counter is impossible by the thermodynamic cost alone.

[swijck]

Correct. Better to get into other forms of cryptography than pointlessly increase the numbers. We need to think more about PQ proofing.

[brokenmachine]

He could get lucky though. :-P