Mxproject Asian Pop Music Radio & Entertainment

When you type on a standard computer keyboard, electrical signals run through the cable to the PC. Those cables aren't shielded, so the signal leaks via the ground wire in the cable and into the ground wire on the computer's power supply.

The attacker connects a probe to a nearby power socket (perhaps in the vacant office next door or a hotel room across the hall), detects the ground leakage, and converts the signal back into alphanumeric characters. So far, the attack has proven successful using outlets up to about 15 meters away.

If you've got a wireless keyboard or are working on a laptop unplugged from the wall, which would make this attack useless, fret not: The hackers have a method for eavesdropping on you too. A simple laser beam -- better than a laser pointer, but not by much -- can be pointed a shiny object on the table where the computer sits, and the beam's reflection is captured by a receiving system. The vibration of that reflection caused by the striking of keys can be analyzed and, as with the electrical outlet system described above, reconstructed into words, since every key produces a unique vibration pattern. All this technique requires is a direct line of sight to the PC and a few hundred dollars worth of equipment.