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INTEGRITY PROTECTED SMART CARD TRANSACTION

  • US 20110179283A1
  • Filed: 03/25/2011
  • Published: 07/21/2011
  • Est. Priority Date: 07/27/2007
  • Status: Active Grant
First Claim
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1. At least one computer storage media storing instructions that, when executed by a computer, cause the computer to perform a method for authorization using a smart card, the method comprising:

  • receiving, by the computer from the smart card, an encrypted modifier based on a random modifier that was previously encrypted using a randomly-generated data key;

    decrypting, by the computer, the received encrypted modifier based on an integrity key that includes a previous system code that uniquely identifies a previous configuration state of the computer held tamperproof by the computer, and that is further based on a storage root key held secret by the computer, the integrity key securely stored on the computer;

    receiving, by the computer from a user, a personal identification number;

    calculating, by the computer, a prime personal identification number based on the received personal identification number and the decrypted modifier; and

    unlocking, by the computer, the smart card in response to the calculated prime personal identification number matching a previously-set prime personal identification number stored on the smart card, the unlocking resulting in the authorization succeeding.

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