Abstract: Although RFID technologies in the Internet of Things are widely applied. The security of the RFID system has very big challenges. The communication channel between the tag and the reader of the RFID system was most vulnerable, so the integrity and the confidentiality of data transmission could not be guaranteed. Therefore, A protocol to strengthen the security of RFID system communication need to be consider. Taking into account the RFID system hardware conditions and cost constraints, to establish a suitable RFID system security authentication protocol so as to solve the problems encountered in the information transmission. The PRESENT algorithm was a lightweight block cipher, so the PRESENT algorithm was combined with the security authentication protocol in RFID system, and form a new RFID security authentication protocol PRSA (Present based RFID security authentication). PRSA protocol can not only enhance the RFID system security, but also occupy very few hardware resources. Thus PRSA protocol can adapt to the security of communication in the low-cost RFID system.

Key words: Internet of Things; RFID system; security; authentication protocol; PRESENT algorithm