Fans of cyberwarfare (which we are, if only because we like to imagine that it looks like Battlezone) take note: following hot on the heels previous Cyber Storm I and II and Cyber ShockWave wargames, the Department of Homeland Security is sponsoring a little something called Cyber Storm III. Starting yesterday, the three-day exercise simulates more than 1,500 different types of attack, with a special emphasis on identities, trust relationships, and digital certificates. As Brett Lambo, director of Homeland Security's Cyber Exercise Program, told AFP, "we're kind of using the Internet to attack itself. At a certain point the operation of the Internet is reliant on trust -- knowing where you're going is where you're supposed to be." The exercise will test the National Cyber Incident Response Plan as well as the new National Cybersecurity and Communications Integration Center. But you can breathe easily: the operation is focusing on defense, not offense (for now).