Analysis of Passive Attack on RFID Authentication Protocol ULAP

Mutual authentication mechanisms can be used in Radio Frequency Identification(RFID) systems to preserve the confidentiality of the RFID tags.In this paper,a passive attack is presented on a mutual RFID authentication protocol——ULAP(Ultra Light-weight Authentication Protocol),which is designed to resist passive attack.The attack shows that after eavesdropping a few numbers of round communication(expected number is 10),all the secret of the tag can be deduced.Therefore,ULAP can not resist passive attack.