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Several attacks on POS and Hotel keys including brute forcing other guest’s keys from your card information as a start point. Using a Samy Kumkar’s work on mag spoofing, you can inject keystrokes into POS systems just as if you had a keyboard plugged into the system. This includes injecting keystrokes to open cash drawer and abusing Magstripe based rewards programs that are used a variety of environments from retail down to rewards programs in Slot Machines.
The PDF can be found here: https://media.defcon.org/DEF%20CON%20…_______________________________________