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Method of modifying secrets included in a cryptographic module, notably in an unprotected environment

  • US 8,411,864 B2
  • Filed: 02/27/2008
  • Issued: 04/02/2013
  • Est. Priority Date: 03/06/2007
  • Status: Active Grant
First Claim
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1. A method of modifying secrets included in a cryptographic module on a card, the cryptographic module including a set version number that corresponds to a set of a plurality of secrets in the cryptographic module, wherein the cryptographic module:

  • indicates whether a loading of a secret is either successful, or invalid; and

    allows reading of a version number for each secret;

    wherein the method comprises the steps of;

    assigning a predetermined number to the set version number of the set of secrets of the cryptographic module, if the set version number of the set of secrets is equal to a version number that requires a set of new secrets to be loaded, in order to indicate that the cryptographic module is being reloaded;

    for each secret in the set of secrets, loading a corresponding new secret and a version number of said new secret if a version number of the secret is different from the version number of the corresponding new secret to be loaded;

    assigning a set version number of the set of new secrets to the set version number of the set of secrets of the cryptographic module;

    wherein the set version number of the set of secrets of the cryptographic module on the card is recorded in a file of the cryptographic module of the card accessible via an immutable secret.

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