New threat claimed, Keylogging via mains voltage emissions.

Two security consultants have claimed that they have developed a system for monitoring the variance in mains ground current to monitor keyboard strokes.

They say they can do this on a mains socket up to 15 meters away from the target computer for a hardware cost of $500. They are planning to demonstrate the device at the BlackHat 2009 conference at the end of July. We will report back on the results.

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