Often we don’t know we are in danger until we get clobbered. We have all had that feeling in the pit of our stomachs after something heavy falls where we were standing a few minutes ago. In the middle ages ignorance of disease killed many and the same is true of most in the modern world of computer security. You can’t defend against these things: - Attacks when you don’t know how they are done - Attacks to which you don’t know you are vulnerable - Attacks you don’t realize are possible Make an effort to stay up to date with exploits (preaching to the choir no doubt), so you don’t get nailed.