You might want to make use of the extra chain when traveling this summer, as some unscrupulous parties could use Unsaflok to unlock millions of hotel doors around the world in seconds. More specifically, the RFID-based keycard locks sold by lock maker Dormakaba.
First, someone would need to acquire a keycard from the target hotel and then use a read-write device to obtain a certain code from that card. The unscrupulous party would then need to write two of their own keycards. Next, all they would need to do is tap those two cards on a lock. The first tap rewrites a certain piece of the lock’s data, and the second actually opens the door.
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Two quick taps and we open the door. And that works on every door in the hotel,” said Lennert Wouters, Researcher at KU Leuven University in Belgium’s Computer Security and Industrial Cryptography group..
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