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The passive RFID system was spotlighted as a future technology for automatic identification, but it has a possibility of eavesdropping and leaking of private information. The authors propose a security enhanced protocol with mutual authentication and data cryptographic mechanism between secure reader and tag for the UHF passive RFID system. They use the OFB-like mode of AES as an effective encryption method. The proposed security enhanced protocol is designed to satisfy the demands of ISO/IEC WD 29167-6, namely the new international standard for the RFID security services. In addition, they present that the proposed security process conforms to the time limitation of the ISO/IEC 18000-6C.
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