It has been known that one brand of hotel lock, Onity, could be easily hacked by plugging into its power port that's on every lock (
http://www.computerworld.com/). At this year's Black Hat an upgraded attack can unlock all the doors in a hotel, including creating a maid's master card. You scan one card to identify the fields and then brute force the relevant fields (
http://www.computerworld.com/). The solution is old-school: jamb a chair under the door knob or carry a door stop to jamb under the door.
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