Computerworld published an article describing a tiny device that can wirelessly hack point of sale and other magnetic-stripe based systems by sending malicious keyboard commands using a design vulnerability in those systems.  Apparently a hotel room lock could be hacked within 18-30 minutes using the device.

The device was inspired by “MagSpoof” which is a device that can store magnetic stripe contents, wireless emulate a magnetic stripe read at point-of-sale terminals and even disable chip-and-pin transactions.   The device generates an electromagnetic field that tricks the card reader.
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