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Radio Frequency IDentification (RFID) is a pioneer technology which hasdepicted a new lifestyle for humanity in all around the world. Every day weobserve an increase in the scope of RFID applications and no one cannotwithdraw its numerous usage around him/herself. An important issue which shouldbe considered is providing privacy and security requirements of an RFID system.Recently in 2014, Cai et al. proposed two improved RFID authenticationprotocols based on R-RAPS rules by the names of IHRMA and I2SRS. In this paper,we investigate the privacy of the aforementioned protocols based on Ouafi andPhan formal privacy model and show that both IHRMA and I2SRS protocols cannotprovide private authentication for RFID users. Moreover, we showthat theseprotocols are vulnerable to impersonation, DoS and traceability attacks. Then,by considering the drawbacks of the studied protocols and implementation ofmessages with new structures, we present two improved efficient and secureauthentication protocols to ameliorate the performance of Cai et al schemes.Our analysis illustrate that the existing weaknesses of the discussed protocolsare eliminated in our proposed protocols.

Investigating the Performances and Vulnerabilities of Two New Protocols Based on R-RAPSE