It isn't at all a black box art. It is true that some exploits can get pretty esoteric, but the vast majority are very simple. Don't use a default password. Don

It isn't at all a black box art. It is true that some exploits can get pretty esoteric, but the vast majority are very simple. Don't use a default password. Don't type your passsword anywhere you shouldn't. Implement a sane access control policy. Use security software in the way it was intended to be used. That is enough to prevent 99% of attacks.