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RFID was first proposed as a technology for the automatic identification of objects. However, some recent RFID devices can provide additional objects information and can be used for other applications. Security requirement is essential in most of the applications. An essential research challenge is to provide efficient protection for RFID systems, in particular against tag cloning and information modification. A new data structure of RFID tags is introduced in this paper. Together with the Identity-based crytography, this new data structure can provide efficient authentication and digital signature for RFID tags.
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