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Authentication method and system with a smartcard

  • US 5,347,580 A
  • Filed: 06/01/1993
  • Issued: 09/13/1994
  • Est. Priority Date: 04/23/1992
  • Status: Expired due to Fees
First Claim
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1. A method for authenticating a user with a smartcard to a system including an authentication server and a plurality of distributed work stations connected to said server, said smartcard having a unique card identifier and including a running value device, input-output means, and encrypting means with a secret card key, said server having stored user names, user personal identifiers, at least one secret key, and card identifiers, said method comprising the following steps:

  • (1) indicating with a smartcard a card running value and computing with the smartcard a first encryption of the card running value under a the secret card key;

    (2) receiving at a work station a user name, a card identifier, the card running value, and a user authenticator computed from a user'"'"'s personal identifier and the first encryption;

    (3) transmitting from the work station to the server the user name, the card running value, the card identifier, and a second encryption of the card running value under the user authenticator;

    (4) determining with the server a potential secret card key from the received card identifier and a potential personal identifier from the received user name;

    (5) computing with the server a first potential encryption of the received card running value under the potential secret card key, and, combining the potential personal identifier and the computed first potential encryption to obtain a potential user authenticator;

    (6) computing with the server a second potential encryption of the received card running value under the potential user authenticator, and comparing the second potential encryption to the received second encryption; and

    (7) determining if the second potential encryption matches the received second encryption, and transmitting an accept signal from the server to the work station if a match is determined.

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