There's only around a million (or a couple million if you're generous with conjugations, lulzspeak, etc) English words. If you figure passwords understand 75 c

There's only around a million (or a couple million if you're generous with conjugations, lulzspeak, etc) English words. If you figure passwords understand 75 characters, then one million passwords is around 3.2 randomly chosen characters. If you step up to 4 randomly chosen characters, you'd cover 31 million entries, and hence have about the same strength as reversing a hash of 31 million different words. A 4 character password is woefully weak by modern standards.