We'll soon find out, says Andy Purdy, acting director of the National Cyber Security Division of the Department of Homeland Security. Last week, Purdy oversaw the first large-scale mock cyberattack, aimed at gauging the nation's readiness to handle computer-based threats to critical infrastructure. The weeklong exercise, dubbed "Cyber Storm," came three years after the Bush administration signed off on the National Strategy to Secure Cyberspace. Results of the exercise will be made public this summer.