Lightweight class RFID safety certification method based on Present algorithm

The invention discloses a lightweight class RFID safety certification method based on a Present algorithm. The lightweight class RFID safety certification method based on a Present algorithm comprises steps of realizing identity mutual certification between a label and a database through sharing an old cipher key and new cipher key and secretes information between the back end database and the label, adopting a two-way random number as a fresh quantity during a protocol execution process and performing encryption calculation, wherein certification information of a label end on the database is encrypted by producing the random number from a database end and the certification information of database end on the label is encrypted by the random number generated by the label end, and executing a Present encryption algorithm to verify identities of two parties in each verification process. The lightweight class RFID safety certification method based on the Present algorithm has characteristics of safety and privacy protection, can better resist various attacks coming from the outside of the RFID system, can protect content privacy, position privacy and front and back safety and resists replay attacks, eavesdropping attacks, etc.