A modified security protocol of RFID system

RFID is a new kind of non-contact automatic identification technology. It has been widely used in access control, transportation system, target tracking, etc. But in the actual application environment,there are still many security risks in the RFID system. So,design and improving relevant security mechanisms and authentication protocols become imperative to the RFID system. This article analyses the formation of the RFID system,summarizes the reasons why security problems exist. Then it introduce the security strategy,mainly some familiar physical security mechanisms and authentication protocols based on the password techniques. It analyses their advantages and disadvantages simply, emphasizes a hybrid-encryption security module. And then it proposes a modified method by the secret key update and workload transfer. This method enhances the hybrid-encryption's security and utility, and it can resist location tracking,replay attack and other means of attack.