A commercial electronic security system for a combined encryption

Object of the present invention is to provide a combined product security systems. That is, a combination of an electronic article security system for encryption, the device comprising an RFID reader, RFID reader, the random number generator, and the system server in an RFID tag on each piece of merchandise. Message corresponding to a period of each commodity serial number string composed MAi. Before the factory each item, generating a random number sequence MAi MBi as the digital signature by the random number generator. MAi embodiment of the encryption operation, after a one-way function operation MBi obtain two combined message T1i and T2i. Before the factory each item, the RFID tags are combined message previously written the T1i, T2i combined message is stored in the system server.