METHOD OF MUTUAL AUTHENTICATION BETWEEN READER AND TAG IN RFID SYSTEM AGAINST ATTACK

• Main Authors: LEE, HONG JIN, WON, YANG DON, PARK, YOUNG SU, CHO, SUNG HO
• Format: Patent
• Language: English; Korean
• Published: 22.10.2012
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; HANDLING RECORD CARRIERS; PHYSICS; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; WIRELESS COMMUNICATIONS NETWORKS

PURPOSE: A mutual authentication method between a reader and a tag in a RFID system against attacks is provided to greatly reduce production costs of the tag by using a pseudorandom number generator used in the tag of a standard EPC(Electronic Product Code)global Gen2. CONSTITUTION: A reader transmits a query message to a tag(S101). The tag transmits a first random number to the reader(S102,S103) The reader requests database retrieval by transmitting the received first random number to a server. The server retrieves the first random number in the database(S104). The tag authenticates the reader by receiving a second random number and comparing the received random number and its own random number and the tag sets a single bit tag transaction flag as "0"(S107). The tag generates an RN3(Alarm=0) or RST(Reset) message(S108). The reader transfers the received RN3 or RST message from the tag to the server. The server authenticates the tag by checking the received message(S110). [Reference numerals] (12) Tag; (14&16) Reader(server); (S103) Tag alarm and tag transaction flag processing; (S104) Database research; (S105) Tag alarm and tag transaction flag processing; (S107) Reader authentication and random number generation; (S108) RN3 or RST generation according to an alarm state; (S110) Tag authentication or reset processing according to a received message