[murgindrag]

The problem is I don't need to search the whole key space. Even with very goods encryption algorithms, there are faster attacks. They're not FAST attacks, mind you, so the keys are safe, but they are FASTer.

[PaulHoule]

I think most of the time there is some attack on a cipher which is faster than the most obvious brute force attack.

Sometimes the speed-up is a little, sometimes it is a lot.