Wireless tags

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 (7A) 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 (7A) and decrypting the first keys of cryptograph acquired from the master tag (7A) 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.