Smart card and method for bidirectional data transfer between a terminal and a smart card
First Claim
1. A method for bidirectional data transfer between a terminal and a smart card with a purse function, comprising:
- writing a transfer value from the terminal to a balance-of-account memory of the smart card;
writing a write-in control value (E) to a control memory of the smart card together with the writing of the transfer value to the balance-of-account memory; and
erasing the write-in control value (E) as soon as the transfer value is completely stored in the balance-of-account memory.
1 Assignment
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Accused Products
Abstract
A method for bidirectional data transfer between a terminal and a smart card with a purse function comprises writing a transfer value from the terminal to a balance-of-account memory of the smart card, writing a write-in control value (E) to a control memory of the smart card together with the writing of the transfer value to the balance-of-account memory, and erasing the write-in control value (E) as soon as the transfer value is completely stored in the balance-of-account memory. In addition, a smart card for bidirectional data transfer between a terminal and a smart card with a purse function comprises at least one balance-of-account memory for storing a transfer value transmitted by the terminal and a control memory. The balance-of-account memory is assigned to the control memory for storing a write-in control value (E), which is alterable depending on the presence of a fault. The transfer value stored in the balance-of-account memory is finally stored only if the control memory has assumed a writing confirmation state.
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Citations
12 Claims
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1. A method for bidirectional data transfer between a terminal and a smart card with a purse function, comprising:
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writing a transfer value from the terminal to a balance-of-account memory of the smart card;
writing a write-in control value (E) to a control memory of the smart card together with the writing of the transfer value to the balance-of-account memory; and
erasing the write-in control value (E) as soon as the transfer value is completely stored in the balance-of-account memory. - View Dependent Claims (2, 3)
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4. A smart card for bidirectional data transfer between a terminal and a smart card with a purse function, comprising:
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at least one balance-of-account memory for storing a transfer value transmitted by the terminal; and
a control memory for storing a write-in control value (E), wherein said at least one balance-of-account memory is assigned said control memory for storing a write-in control value (E), alterable depending on a presence of a fault, and wherein said transfer value stored in said balance-of-account memory is finally stored only if the control memory has assumed a writing confirmation state. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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Specification