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Method of electronic payment by chip card by means of numbered tokens allowing the detection of fraud

  • US 5,305,383 A
  • Filed: 08/16/1993
  • Issued: 04/19/1994
  • Est. Priority Date: 04/03/1991
  • Status: Expired due to Fees
First Claim
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1. A method of performing an electronic automated transaction by initializing a management card from an initial management card, said management card for interfacing with a consumption card, to copy a plurality of tokens to said consumption card in order for said consumption card to transfer tokens to a vendor by interfacing said consumption card with a vendor card to copy a predetermined number of tokens to said vendor card, each of said cards including a microprocessor and input and output terminals, comprising the steps of:

  • generating a distribution array in said initial management card, said distribution array including an initial set of t consecutive entries in said initial management card, a random portion of said numbers being removed from said set;

    generating a subset of numbers from said initial set and copying each number of said subset to said management card to form a sales array;

    said sales array including t number of entries, each entry corresponding to one of said tokens;

    each token being valid for payment upon interfacing said consumption card with said vendor card;

    copying a predetermined amount of tokens from said sales array of said management card to said consumption card;

    upon transacting a sale, copying a predetermined number of tokens from said consumption card to said vendor card;

    updating said consumption card to prevent said copied tokens from again being copied to said vendor card or a further vendor card; and

    comparing the corresponding number of each token received by said vendor card with the corresponding number on said management card to authenticate a valid transfer of tokens between said consumption card and said vendor card.

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