NudeRaider shouted: a) what makes you think it can't? b) What makes you think anything can't be bruteforced? (you just have to know what to do)
@ (b): There are some very simply described questions with simple-to-confirm solutions that even when given parameters as low as 100, can result in more solutions than there are atoms in the universe, making it physically impossible to solve these (very common) problems.
Sacrieur -- the actual figure would be drastically more than that