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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata.Got a minute?
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2 .Connecting your computer to the Internet gives would-be spies an obvious entry point to your machine.
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3 .But other ways exist to snoop.
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4 .Because even computers that aren't connected to the Internet broadcast their activity in the form of electromagnetic radiation.
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5 ."Basically your computer is full of transistors.
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6 .And they're switching current from high to low depending if it is a zero or a one of the bit that they're trying to execute."
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7 .Alenka Zajic, an electrical engineer at Georgia Tech.
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8 ."When you do that you're creating a voltage fluctuation and current fluctuation.
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9 .And that basically creates electromagnetic field."
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10 .By hooking an antenna and receiver up to a laptop, Zajic and her colleagues were able to log the keystrokes of a computer in the next room, by measuring exceedingly tiny fluctuations in the computer's radiation.
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11 .The same technique can reveal which programs you're using, too.
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12 ."Every one of them has a different signature in electromagnetic fields.
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13 .So I can tell which application you opened by looking into the spectrum."
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14 .The researchers quantified the signal available to eavesdroppers in a recent paper, presented at the IEEE/ACM International Symposium on Microarchitecture in the U.K.
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15 .Of course, real spies at the NSA and the CIA probably already know about this trick, she says.
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16 .But by alerting developers to the problem, it might be possible to mask these electromagnetic leaks.
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17 .And keep your computer's activity to yourself.
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18 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Christopher Intagliata.
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