| 摘要 |
PROBLEM TO BE SOLVED: To prevent an electronic commercial transaction from being illegally performed with an IC card stolen by a third person by holding the user identifier of a computer in each user space and permitting subsequent digital processings in the IC card only when this identifier is coincident with a corresponding value in the IC card. SOLUTION: The user identifier of a computer is held in each user space and only when this identifier is coincident with the corresponding value in an IC card, subsequent digital processings in the IC card is made possible. Concerning such a computer system, an IC card input/output program 203 receives log-in information from a space information table 205 with a program ID as a key and inputs it through an OS 204 and an IC card reader/writer 103 to an IC card 104 together with an access permission request instruction. In the IC card 104, this log-in information is compared with log-in information previously registered on the IC card, and when the both are coincident, an address permission signal is returned to a user program 201. |
