In last night's Republican debate, one of the questions posed to the candidates was "What threat might we face in the next few years that no one is talking about today?". The question was in the context of the 9/11 attacks shortly after George Bush became President, that defined his term in office. One of the answers that caught my attention was cyber-terrorism. Instead of a physical attack, our critical computer systems and networks could be attacked by hackers. When you stop and think about how pervasive computing is in our modern lives, covering everything from banking to delivery of our utilities, it's scary to think of how vulerable we are.