A picture is worth a thousand passwords!
Data security is a hard enough problem to solve on even a heavily regulated corporate network, but it becomes even more difficult when users are out in the wild with PDAs, cell phones and other portable communications devices. A recent PhD project at the University of Twente in the Netherlands has described a user-friendly solution to cryptography for ad-hoc network transfers, such as sending files over infrared or Bluetooth between two PDAs, and it's as easy as taking a picture.
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