Wireless tag system, wireless tag access control device, wireless tag access control method, wireless tag access control program and wireless tag

摘要

A wireless tag system and a wireless tag access control device make it easy to keep and manage keys of cryptograph with an enhanced level of security. The wireless tag system comprises a plurality of wireless slave tags 1 through 3 which store information encrypted by means of a first key of cryptograph, a wireless master tag 7 A which store the first keys of cryptograph of the slave tags belonging thereto encrypted by means of the second key of cryptograph and a wireless tag access control device which accesses the master tag 7 A and decrypting the first keys of cryptograph acquired from the master tag 7 A by means of the second key of cryptograph and then the tag data acquired from the slave tags 1 through 3 by means of the decrypted first keys of cryptograph.