As many as 75 percent of enterprises have been or are being infected with undetected, financially motivated, targeted attacks that evaded their traditional perimeter and host defenses. Experts say it’s hard to determine how widespread this type of activity is because the attacks are so difficult to identify and track. Even when electronic spying is detected, it’s often impossible to know the real source of the attack. In this special report, InfoWorld.com answers the key questions on who’s spying, what they’re looking for and what you can do.”]