Patent ID: 8547202

Claim:
An operating method of a radio frequency identification (RFID) tag having a memory block that stores a predetermined authorization code and a predetermined identification code associated with an RFID reader, the method comprising steps of: a1) receiving an approval request with an identification code of the RFID reader from the RFID reader; a2) determining the predetermined authorization code according to the predetermined identification code and the identification code; b) determining by the RFID tag whether the RFID reader is authenticated according to the approval request and the predetermined authorization code; and c) responding to a subsequent request transmitted from the RFID reader when the RFID reader is authenticated by the RFID tag, wherein the memory block further stores different minimum authorization level information, respectively for each of reading and writing privileges, associated with respective memory sub-blocks, and wherein the memory sub-blocks have different sizes, the RFID tag determines a predetermined authorization level of the RFID reader according to the predetermined identification code and the identification code, and the method further comprises a step of: (d) determining a reply method in response to a subsequent request according to the predetermined authorization level and the minimum authorization level information when the RFID reader is authenticated by the RFID tag.