| 摘要 |
PURPOSE:To a foul transaction with an IC card by erasing the monetary value of the card in a state where the application of the card is temporarily disabled based on the collation result of identification numbers. CONSTITUTION:When it is decided that the data reinput frequency exceeds a prescribed level (n), a flag is written to a secret zone 243 of a storage memory 24 by a command given from a central controller 17. Hereafter the use of an IC card is temporarily disabled and the credit balance data on the latest transaction area 244a of a transaction area 244a of the memory 24 is set at '0'. Furthermore the contents of a credit zone 245 are cleared, that is, the credit limit amount data on the credit limit 245a are set at '0'. At the same time, the continuous use permission frequency is also set at '0' in an application mode of an off-line terminal of a floor multiplier 245b. Thus the use of the IC card is temporarily disabled and at the same time the monetary value of the card is totally deleted. Then the application of the IC card is forcibly limited to the use at an on-line terminal. |
