In cryptography, you don't want "ludicrously" infeasible, as in the NSA can just about afford the hardware and do it, you want astronomically infeasible.
Its not enough to just make it astronomically infeasible to attack everyone.
In cryptography, you don't want "ludicrously" infeasible, as in the NSA can just about afford the hardware and do it, you want astronomically infeasible.