"The study warns of the risk that terrorists could mount a computer-network attack in which the casualties would be measured not by the hundreds or thousands killed but by the millions severely affected by damaged infrastructure, like electrical grids’ being taken down." I wonder about this. It seems like every study about the dangers of terrorism mentions this kind of cyber-attack as a possibility, and I just don't…
A number of folks have argued that if it so easy to do this level of damage with a cyber attack why hasn't a terrorist done so in the last 10 years? Its not like you have to 'sneak' into the country or get pass the security theatre at the airport to mount such an attack. Hacking toolkits and websites are at least as easy to find as bomb making web sites.
Hactivists exist, obviously, but your brand-name terrorists like Al Qaeda have not used the Internet as an attack vector.
Yet.