Cheap(er) way to steal electronic data

Using power outlets and cheap lasers? They are probably cheaper in the states, but regardless, they claim that with $600 worth of equipment and a laptop with sound adapter, this can be achieved. Here's the article

"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"

This is nothing new of wire-tapping actually:

"In the power-line exploit, the attacker grabs the keyboard signals that are generated by hitting keys. Because the data wire within the keyboard cable is unshielded, the signals leak into the ground wire in the cable, and from there into the ground wire of the electrical system feeding the computer. Bit streams generated by the keyboards that indicate what keys have been struck create voltage fluctuations in the grounds, they say. "

There may be some differences in keyboards and how they signal with variations in frequency but researches say that it is even possible to focus on 1 keyboard from a distance of 15 meters. Pretty interesting stuff. What if I had some real $$$ to invest in such technology instead of just $600 mentioned here (ie. government)?

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