Unlinkability and real world constraints in RFID systems

Unlinkability, the property that prevents an adversary recognizing whether outputs are firom the same user, is an important concept in RFID. There are many proposed schemes that provide unlinkability, however most of the schemes don't consider constraints of the real world. In this paper, we discuss the unlinkability and the real world constraints in RFID systems, and simulate the attack by an adversary. The simulation results show the real world constraints have possibility that break the unlinkability. We also analyze the simulation results from three viewpoints.