[DarkmSparks]

yes, and that is a solved problem for all encryption already, you need that to find any key in encryption.

what makes that hard now is the search takes so much time.

In a theortical post quantum world that search wont take much time.

So the only way I see that post quantum encryption can be secure is if it is impossible to guess a solution and test it for correctness - which for whatever reason... never seems to get addressed.