| 摘要 |
PROBLEM TO BE SOLVED: To provide a card system where troubles due to protection of security and mismatched data can be prevented. SOLUTION: A terminal 20 accommodating an IC mount card 10 and a server 30 connect to an internet L to configure the system. The server 30 conducts mutual authentication with the IC mount card 10, stores resulting information of the mutual authentication of itself and the card 10, sets flag information denoting a state of data stored in the card to '1' when the authentication result information is valid, sets the flag information denoting a state of the data stored in itself to '1' and transmits write object data to the IC mount card 10. Its own flag information is updated to '0' by confirming update of the data recording and the flag information of the card to '0'. |
