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Hack Into Laptops Via Power Outlet, Lasers

Is using a laptop getting dangerous? Thanks to a new exploit used by hackers, your information may not be safe out in public. In a recent article published by Network World, hackers can grab keyboard signals through its unshielded wiring; signals leak into the ground wire in a cable, and then travel into the laptop's electrical system. Bit streams generated by the keyboards that indicate what keys have been struck create voltage fluctuations in the grounds, according to the site. Thus if plugged in, hackers retrieve the information through the power outlet.

However, attackers can still gain access when laptops are unplugged. By using a cheap laser, a hacker can retrieve keystrokes by pointing the laser on a shiny part of the laptop, or a shiny object nearby. The hacker then aligns a receiver to capture the reflected light beam; the light captures to modulations stemming from vibrations caused by striking the keys.

“The only thing you need for successful attacks are either the electrical grid or a distant line of sight, no expensive piece of equipment is required,” Barisani and Bianco said. The equipment needed to carry out the power-line attack could cost as little as $500. The laser attack gear costs less: $100 if the attacker already owns a laptop with a sound card.

Both hacks will be demonstrated by Andrea Barisani and Danielle Bianco of Inverse Path later this month at the Black Hat USA 2009 security conference in Las Vegas.