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Smart card and method for bidirectional data transfer between a terminal and a smart card

  • US 6,402,026 B1
  • Filed: 12/10/1999
  • Issued: 06/11/2002
  • Est. Priority Date: 12/19/1998
  • Status: Expired due to Term
First Claim
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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.

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