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It is difficult to implement a mature cryptography mechanism in the low-cost RFID system because of the limitation of available resources. Following the analysis of several kinds of typical authentication protocols, an enhanced authentication protocol is proposed to confront security defects in low-cost RFID systems. This scheme adopts a bi-directional authentication mechanism, and has resolved the data synchronization problem caused by IDspsila dynamic refreshment. Furthermore, the possibility of denial-of-service attacks can be reduced. This scheme is applicable to a system with a large number of tags and can meet the requirements of the users.