Everyone knows you shouldn’t reveal your passwords. But what if you're out sick and your coworker needs to borrow your computer?
Carnegie Mellon University’s Grey project lets you give people temporary access to your PC without the risk that they could later use your password to break in. It replaces ordinary login methods with smartphone access, in which your phone uses Bluetooth to send a computer an unfakeable digital access ID. To allow a pal onto your PC, simply send a one-time pass to his phone.
The same system could also control office doors or file cabinets, so you could instantly revoke or grant entry whenever needed. A start-up company, GreenBack Systems, recently began developing Grey for possible use in workplaces in two to four years.
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