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Today lots of office doors open with smartcards, not keys. Just wave your ID, and "open sesame." Now you can do that with some smartphones, using an app called ShareKey. It's based on Near Field Communication, or NFC—a way to send data wirelessly over short distances. Many Android phones already have NFC chips built in.
如今许多办公室不再使用钥匙开门，而是使用智能卡。挥动一下你的身份识别卡，就能够“芝麻开门”。现在只要在智能手机上安装一款名叫“ShareKey”的应用程序，你也可以那样做。ShareKey 基于近场通讯（NFC）技术来近距离发送无线信号。许多安卓系统的手机都已植入了NFC芯片。
Here's how ShareKey works. After installing the app, you register with a central server. In a hotel, that would be run by the front desk. They'd verify your smartphone as an authorized guest, and send you an encrypted key—valid only for the length of your stay. Then, wave your phone over your room's lock. 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.
下面来讲讲 ShareKey 的工作原理。安装完应用程序后，在中央服务器注册一个账号。如果是在宾馆，会有前台来操作。他们会验证你的智能手机，将你授权成为客人，然后给你发送密钥——而且只在你入住期间有效。然后，把手机放在房间的锁前晃一下。锁会在不到一秒的时间内验证密钥的真实性，判断密钥存在你的手机里还是一个小偷的手机里。
Want to let a friend in? Ask the app to issue a new key linked to your friend's phone—and just text or email it. The researchers are presenting ShareKey in March at the CeBIT trade fair in Germany.
如果朋友想进来怎么办？在应用里重新生成一个密钥，并链接到你朋友的手机上——发短信或者邮件即可。研究人员在德国国际信息及通信技术博览会上展示了这一款应用。
Researchers say ShareKey could be used for offices, homes or Zipcar. Just make sure to keep your phone under lock and key.
研究人员称 ShareKey 可以在办公室、住所或者租车时派上用场。只要确保妥善保管你的手机就行了。
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