PAP: A privacy and authentication protocol for passive RFID tags. - Alex X. Liu; LeRoy A. Bailey (Comput. Commun., 2009)

RFIDGuard: a lightweight privacy and authentication protocol for passive RFID tags. - Alex X. Liu; LeRoy A. Bailey; Adithya H. Krishnamurthy (Secur. Commun. Networks, 2010)