Hacker finds flaw in hotel locks, can ruin your vacation with $50 DIY gadget
The next time you stay in a hotel room, run your fingers under the keycard lock outside your door. If you find a DC power port there, take note: With a few hacker tricks and a handful of cheap hardware, that tiny round hole might offer access to your room just as completely as your keycard.
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Story added 25. July 2012, content source with full text you can find at link above.