Researchers create device that opens hotel doors with old key cards
 

Researchers at cybersecurity firm F-Secure have designed a device that can pull data off of hotel key cards and essentially create a master key for an entire hotel. Alarmingly, the key card doesn't even have to be currently in use. The device can ste...

https://www.engadget.com/2018/04/25/...old-key-cards/