| 摘要 |
PROBLEM TO BE SOLVED: To prevent illegal access from the outside of a card and to improve security without increasing the kind of dedicated file by arranging a flag for specifying the ability/disability of execution for every operation in each data area. SOLUTION: An IC cod 2 has a CPU 2a and an EEPROM 2d as a non-volatile memos. The mutual. certification is performed between terminal equipment and the IC card 2 and after the certification is established, read/write into memories 2a-2d of the IC card 2 is possible. Concerning the EEPRCE 2d, the flags (addition flag, subtraction flag, multiplication flag and division flag) for specifying the ability/disability of execution for every operation are arranged in data areas. The set/cancel of the flag is certified by password collection, password certification and fingerprint or the like. In the case of addition to be used for the accumulation of how many times the card is utilized, while referring to the flag set in an addition data file, addition is performed by an adding instruction when the flag is turned on. |
