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Identification system for authenticating both IC card and terminal

  • US 4,746,788 A
  • Filed: 09/15/1986
  • Issued: 05/24/1988
  • Est. Priority Date: 09/17/1985
  • Status: Expired due to Term
First Claim
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1. An identification system comprising:

  • IC card means;

    IC card terminal means capable of electrically communicating with the IC card means when the IC card means is loaded thereon;

    said IC card means including first memory means for storing at least data unique to said IC card means and encrypted unique data obtained by encrypting said unique data;

    said IC card terminal means including decrypting means for decrypting said encrypted unique data stored in said first memory means to derive decrypted unique data;

    said IC card means further including first comparing means for comparing said decrypted unique data sent from said IC card terminal means with said unique data stored in said first memory means so as to judge whether said unique data is coincident with said decrypted unique data; and

    said IC card terminal further including second comparing means for comparing said decrypted unique data with said unique data stored in said first memory means and sent from said IC card means so as to judge whether said unique data is coincident with said decrypted unique data, thereby confirming identities of both said IC card means and said IC card terminal means.

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