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Recreating a cryptographic key in a replacement device

  • US 8,259,947 B2
  • Filed: 01/05/2004
  • Issued: 09/04/2012
  • Est. Priority Date: 01/07/2003
  • Status: Active Grant
First Claim
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1. A method operational for authentication in a public cryptographic system comprising:

  • creating a first private key and corresponding first public key at a mobile user device;

    creating a second private key associated with the first private key and creating a second public key corresponding to the second private key at the mobile user device;

    outputting the second private key from the mobile user device such that it is not stored on the mobile user device while retaining the first private key in the mobile user device, wherein outputting the second private key comprises transmitting a plurality of shares of the second private key from the mobile user device to a plurality of different entities once, such that the second private key can be re-created and used when the first private key is inaccessible;

    transmitting the first public key and the second public key to a verifier device; and

    using the retained first private key for authentication of the mobile user device prior to using the second private key.

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