simple
Dont connect your critical infrastructure and control systems to the internet. There really is no need. IF (and its a big if) you think you need to have centralised control (for someone to bomb) or communications (for someone to cut) between the power stations, fuel pumps, water gates or whatever it is then put some armoured cables buried deep underground in place.. it can be done, sure we did it before
Biting the hand that feeds IT
