A Novel Bidirectional RFID Identity Authentication Protocol

Rapid advances of IC (Integrated Circuit) technology make the security be widely concerned. Traditional identity authentication protocols depend on binary secret key and encryption algorithm, and issues of complex computation and high cost exist in previous protocols. To realize a low-cost RFID (Radio Frequency Identification) identity authentication protocol, we propose a two-level arbiter PUF in RFID systems, which has advantages of less area, higher randomness and higher stability compared to that of traditional structure. In this work, a double PUF based bidirectional RFID identity authentication protocol is proposed on basis of the proposed PUF structure, aimed at providing authentication for IC, such as low-cost RFID system. The bidirectional authentication between the server and the tag is realized. In authentication, the dichotomy XOR operation and character padding are performed to the response of PUF, instead of making use the string matching method, which will not expose the response of PUF to the verifier. Experimental analysis shows that, the propose protocol can resist various malicious attacks and can be used in many low-cost hardware systems.