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Process for protection against fraudulent use of smart cards, and device for use of the process

  • US 5,162,638 A
  • Filed: 10/31/1990
  • Issued: 11/10/1992
  • Est. Priority Date: 11/03/1989
  • Status: Expired due to Term
First Claim
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1. A process for validating a new smart card after an end of period of validity of an old smart card in a system of distribution of one of goods and services, wherein said system includes at least one management center and at least one terminal connected to said center, said process comprising the steps of:

  • assigning an identity to each user which identity is memorized in at least two cards sent to said user; and

    verifying at the end of the period of validity of said old card that a new card has the same identity as said old card, wherein said terminal reading and transmitting the identity of said old card to said new card which is inserted into said terminal after said old card has been withdrawn from said terminal; and

    at least one field is reserved in the cards for memorization of unique data relative to the identity of the user and wherein it is checked in said cards that when the users start to use said new card, said field of the new card is identical to that of the old card.

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