Patent ID: 8878650

Claim:
A radio frequency identification (RFID) security reader that communicates with an RFID security tag that supports a security function, the RFID security reader comprising: a processor module that processes a security protocol and that forms transmission data to transmit to the RFID security tag; a modem that comprises an encryption module that encrypts the transmission data and a decryption module that decrypts reception data from the RFID security tag and restores the reception data to original data and an encoder that encodes and outputs the encrypted data, and a decoder that decodes the reception data and outputs the reception data to the decryption module; and a transmitting/receiving module that processes data that are output from the modem and transmits the data to the RFID security tag, processes reception data from the RFID security tag, and outputs the reception data to the modem, wherein the transmission data include a command and parameter data, and the encryption module generates encrypted data by encrypting the parameter data and adds the command at the front of the encrypted data, and wherein the processor module transfers the size information of the command together with the transmission data to the modem.