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Proper privacy protection in RFID systems is important. However, many of theschemes known are impractical, either because they use hash functions insteadof the more hardware efficient symmetric encryption schemes as a efficientcryptographic primitive, or because they incur a rather costly key search timepenalty at the reader. Moreover, they do not allow for dynamic, fine-grainedaccess control to the tag that cater for more complex usage scenarios.  In this paper we investigate such scenarios, and propose a model andcorresponding privacy friendly protocols for efficient and fine-grainedmanagement of access permissions to tags. In particular we propose an efficientmutual authentication protocol between a tag and a reader that achieves areasonable level of privacy, using only symmetric key cryptography on the tag,while not requiring a costly key-search algorithm at the reader side. Moreover,our protocol is able to recover from stolen readers.

Practical Schemes For Privacy & Security Enhanced RFID