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

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Today lots of office doors open with smart cards, not keys.

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Just wave your ID, and "open sesame."

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Now you can do that with some smart phones, using an app called ShareKey.

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It's based on Near Field Communication, or NFC--a way to send data wirelessly over short distances.

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Many Android phones already have NFC chips built in.

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Here's how ShareKey works.

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After installing the app, you register with a central server.

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In a hotel, that would be run by the front desk.

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They'd verify your smart phone as an authorized guest, and send you an encrypted key—valid only for the length of your stay.

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Then, wave your phone over your room's lock.

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In just half a second, the lock verifies the key's authenticity and that the key is stored on your phone, not a thief's.

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Want to let a friend in?

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Ask the app to issue a new key linked to your friend's phone--and just text or e-mail it.

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The researchers are presenting ShareKey in March at the CeBIT trade fair in Germany.

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Researchers say ShareKey could be used for offices, homes or Zipcar.

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Just make sure to keep your phone under lock and key.

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

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