In this work, we consider privacy in Radio Frequency IDentification (RFID) systems. Our contribution is twofold: (i) We propose a simple, formal definition of strong privacy useful for basic analysis of RFID systems, as well as a different (weaker) definition applicable to multiverifier systems; (ii) We apply our definition to reveal vulnerabilities in several proposed privacy-enhancing RFID protocols; and (iii) We formally analyze and suggest improvements to hash-locks, one of the first privacy-enhancing RFID protocols in the literature.
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Juels et al. (2009) studied this question.
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