ELECTRONIC PAYMENT METHOD USING A MEMORY CARD

摘要

The memory cells are grouped into elements of at least two cells, each element being locatable by an address and having a parity. The balance of the card is the mumber of non-zero even elements of lower address at the address of the odd element which has the lowest address and which is called "delimiter". In order to debit the card and reduce said balance, the delimiter is displaced towards a lower address by creating a new odd element of lower address than the delimiter to be displaced. To credit the card and increase said balance, the delimiter is displaced towards a higher address by giving to the odd elements having an address higher than the delimiter to be displaced an even character and by creating a new odd element with a higher address than the delimiter to be displaced. Application to electronic payment.