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Card-type storage medium protecting data stored in its memory by interrupting an existing transaction after a predetermined permissible number of accesses

  • US 5,845,069 A
  • Filed: 01/22/1998
  • Issued: 12/01/1998
  • Est. Priority Date: 08/01/1994
  • Status: Expired due to Term
First Claim
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1. A method for managing security for a card-type storage medium having a storage unit keeping a data file therein, comprising the steps of:

  • setting beforehand a permissible number of file accesses in one transaction for said data file;

    counting a number of file accesses to said data file after an authentication process and after a start of a transaction when said transaction is started between said card-type storage medium and a transaction apparatus accessing said card-type storage medium to execute said transaction, comparing the number of file accesses counted with said permissible number of file accesses set beforehand, determining that an error has occurred if said number of file accesses exceeds said permissible number of file accesses, and interrupting said transaction.

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