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Radio frequfrequency identification technology will play an important role in the face recognition system. However, the feature of the RFID system may bring out security threatens. This paper analyzes the existing RFID authentication protocols. Then we state an infinite dimension pseudo random number generator to strengthen the protocol security. Then an authentication protocol based on infinite dimension pseudo random number generator is proposed. Compared to the traditional protocols, our method could resist various attack approaches, and protect the tag information and the location privacy of the tag holder efficiently.