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A Radio Frequency IDentification (RFID) yoking proof allows an off-line verifier to make sure whether two tags are simultaneously present. Due to off-line property, a reader cannot differentiate valid from invalid proof records when it probes tags, and would generate lots of useless data. This paper proposes a tree-based matched RFID yoking scheme which enhances the cost of identification from O(log N) to O(1), where N is the number of tags, and allows the reader to collect only those matched tags such that it significantly reduces useless data for the verifier to validate off-line.
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