Abstract: To ensure the security of RFID tags and reduce the loss by aggressive behavior,this paper presents an improved RFID authentication protocol.When the tag is asynchronously attacked,through the  randomly written seed number,asymmetric keys is produced,and after the verification with the key pre-reserved in the backend database,the attacked tag is recovered to the synchronous state,thereby reducing the risk of tag data leakage and ensuring data security of RFID systems.

Key words: radio frequency identification, asynchronous attack, authentication, protocol