Design and implementation of a RFID security authentication protocol

In order to improve the data communication security of the channel between the tag and the reader of Radio Frequency Identification (RFID) technology, this article designs a mutual security authentication protocol aiming at illegal access, tracking, wiretap and other attack technologies. The Protocol adopts SM4 encryption algorithm to encrypt communication data, and the communication data contain random number, tag ID and other key data. This article designs software and hardware systems for protocol authentication as well, taking ATmega16 as the core processor to make the RFID tag card, and implementing communication through the wireless data transmission module and the card reader port. The test results show that, the mutual authentication protocol designed in this article can correctly implement the RFID authentication process, and effectively prevent the illegal access, tracking, wiretap, retransmission and other attacks.