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This paper presents a low-cost and secure authentication protocol to reduce the computational load on both the back-end database and the tags in a distributed RFID system. The proposed protocol is based on a hierarchical group-index to reduce the search time for a tag ID in the back-end database. Thus, when a tag is included in the k-th-level subgroup, the database system takes at most (k+1) ċ (k+1)√m hash operations to find the tag to be authenticated, where m is the number of tags. Furthermore, the proposed protocol also guarantees most security requirements, including robustness against replay and spoofing attacks, synchronization, and indistinguishability.

HGLAP – Hierarchical Group-Index Based Lightweight Authentication Protocol for Distributed RFID System