In medieval times, attackers would use a bell-shaped metal grenade or "petard" to break enemy defenses. These unreliable devices frequently went off unexpectedly, destroying not only the enemy, but the attacker. As Shakespeare noted, "'tis the sport to have the enginer Hoist with his owne petar." That's what I thought of when the Russian Federal Security Service (FSB) recently announced their plans to charge an FBI agent with hacking -- a crime that the agent committed while investigating Russian hackers. In November 2000, Vasily Gorshkov, 26, and Alexei Ivanov, 21, hackers from Chelyabinsk, Russia, broke into various U.S. computers, stole...