초록 ▼

An electronic purse card value system (10) includes terminal devices (12). Each terminal device includes a processor (26) which is in operative connection with a memory (28) and a modem (36). The processor is further in operative connection with components of the terminal device including a customer

An electronic purse card value system (10) includes terminal devices (12). Each terminal device includes a processor (26) which is in operative connection with a memory (28) and a modem (36). The processor is further in operative connection with components of the terminal device including a customer interface (14) through which inputs are accepted and outputs are delivered, a card reader (22) and a printing device (30,34). The terminal devices are operative to communicate with host computers (42,44,46) through a communication system (38). The system is operative to carry out transactions in which data representative of value is loaded and unloaded from integrated circuit chips on customer cards (24). Data representative of value is stored in the memories of the cards such that certain value amounts are stored in one memory area while other value amounts are stored in a second memory area. A third amount is calculated which is a function of both the value amounts in the first and second memory areas and the third value is stored in memory on the card.

대표청구항 ▼

[ We claim:] [1.]1. A method comprising the steps of:storing a first value in a first area of a card memory of a smart card, the first value representative of a first type of data;storing a second value in a second area of the card memory, the second value representative of a second type of data;cal

[ We claim:] [1.]1. A method comprising the steps of:storing a first value in a first area of a card memory of a smart card, the first value representative of a first type of data;storing a second value in a second area of the card memory, the second value representative of a second type of data;calculating a third value, the third value being a function of both the first value and the second value; andstoring the third value in the card memory of the smart card as an integrity check.