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This is Scientific American 60-Second Science. I'm Christopher Intagliata.Got a minute?

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Connecting your computer to the Internet gives would-be spies an obvious entry point to your machine.

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But other ways exist to snoop.

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Because even computers that aren't connected to the Internet broadcast their activity in the form of electromagnetic radiation.

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"Basically your computer is full of transistors.

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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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Alenka Zajic, an electrical engineer at Georgia Tech.

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"When you do that you're creating a voltage fluctuation and current fluctuation.

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And that basically creates electromagnetic field."

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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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The same technique can reveal which programs you're using, too.

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"Every one of them has a different signature in electromagnetic fields.

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So I can tell which application you opened by looking into the spectrum."

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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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Of course, real spies at the NSA and the CIA probably already know about this trick, she says.

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But by alerting developers to the problem, it might be possible to mask these electromagnetic leaks.

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And keep your computer's activity to yourself.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Christopher Intagliata.

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