| 摘要 |
<p>In a conventional method which defines an authentication key for each record, as the number of the records is increased in an access right management for records in a memory of an IC card, the number of the types of authentication keys is also increased to require a larger memory area for storing the authentication keys, thus causing lower memory efficiency. In order to solve such a problem, terminal types (ex. "0H"-"7H") are defined for interrogators (100), so that only the number of authentication keys equal to the number of the terminal types are stored. Each record has the number of access permission bits (325) equal to the number of the terminal types, and specifies terminal types, to which an access is permitted, by setting the bits ON or OFF. <IMAGE></p> |
