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Authentication method and system using IC card

  • US 6,076,164 A
  • Filed: 08/29/1997
  • Issued: 06/13/2000
  • Est. Priority Date: 09/03/1996
  • Status: Expired due to Term
First Claim
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1. A method of authenticating between a user and a network access entity using an IC card, comprising the steps of:

  • executing an initial authentication using the IC card when the user first communicates with the network access entity;

    commonly holding authentication information in both the user and the network access entity if the initial authentication achieves success; and

    executing a re-authentication using said commonly held authentication information without using the IC card when the user communicates again with the same network access entity within a predetermined period of time after the last authentication,wherein said initial authentication is an authentication using a public key cryptographic technique, and wherein said re-authentication is an authentication using a secret key cryptographic technique.

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