It's infeasible to brute-force a 256-bit key[1]. Where cryptanalysis lowers the size of the job enough that it's feasible, the answer isn't to have a bigger key

It's infeasible to brute-force a 256-bit key[1]. Where cryptanalysis lowers the size of the job enough that it's feasible, the answer isn't to have a bigger key, it's to have a better algorithm. [1] https://www.schneier.com/blog/archives/2009/09/the_doghouse_cr.html https://www.schneier.com/blog/archives/2009/09/the_doghouse_...