A novel device fingerprint (DF) based on the hardware property of RFID tags is proposed to enhance the privacy protection and information security of RFID system. The received signal of proximate tag is processed with quadrature down-conversion, cepstrum analysis, etc., the result is called cepstrum DF of tags. Modeling analyses, numerical simulation and experiments demonstrate that the impact of digital information have been eliminated from the proposed cepstrum DF which is mainly determined by the physical property of the hardware of tags. The proposed DF can be used for the physical identification and verification of the identity of proximate RFID tags.
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