Rfid security apparatus for comprising security function and method thereof

PURPOSE: An RFID security apparatus with a security function and method thereof are provided to include a security function using security information, thereby supporting data security. CONSTITUTION: An output key generation unit(303) receives security information of a security tag. The output key generation unit determines an encryption key using the security information. The output key generation unit generates an output key using the determined encryption key. A decryption unit(305) decrypts encrypted data received from the security tag using the output key. An encryption unit(309) encrypts data transmitted by the security tag using the output key.