| 摘要 |
PURPOSE: To prevent the illegal use of a card such as transferring money larger than a paid amount from one card, for example. CONSTITUTION: Concerning this information rewriting process for smart card, an operation for preventing the danger of illegal card usage is added to several operations provided by EP-A-423035. Namely, a memory (M) of the card has a certificate (d), namely, identification (i) of the card, the remainder (b) and prescribed function (g) related to contents (c) of a counter and before updating data, the counter is incremented for '1'. Besides, the certificate (d) is also functioned as a function related to identification (j) of a security module (MS) provided at a terminal. |
