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Methods for secure backup of personal identity credentials into electronic devices

  • US 7,788,501 B2
  • Filed: 08/12/2008
  • Issued: 08/31/2010
  • Est. Priority Date: 08/06/2002
  • Status: Active Grant
First Claim
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1. A method for secure backup of biometric encryption keys associated with a first biometric personal identification device for future restoration of an encrypted digital signature, the method comprising:

  • dividing, at the first biometric personal identification device, a first symmetric key to produce a first portion of the first symmetric key and a second portion of the first symmetric key different from the first portion of the first symmetric key;

    encrypting a digital signature associated with the first portion of the first symmetric key based on a party public key associated with a party to produce the encrypted digital signature, the encrypted digital signature being associated with the first portion of the first symmetric key;

    sending the encrypted digital signature associated with the first portion of the first symmetric key to a backup storage repository separate from the first biometric personal identification device such that the encrypted digital signature associated with the first portion of the first symmetric key is retrievable during a first symmetric key restoration by a second personal identification device, the encrypted digital signature associated with the first portion of the first symmetric key configured to be decrypted during the first symmetric key restoration based on a party private key associated with the party;

    dividing, at the first biometric personal identification device, a second symmetric key to produce a first portion of the second symmetric key and a second portion of the second symmetric key different from the first portion of the second symmetric key;

    generating, at the first biometric personal identification device, a digital signature associated with the first portion of the second symmetric key based on a device private key associated with the first biometric personal identification device;

    encrypting the first portion of the second symmetric key and the digital signature associated with the first portion of the second symmetric key based on the party public key associated with the party to produce an encrypted first portion of the second symmetric key and an encrypted digital signature associated with the first portion of the second symmetric key; and

    encrypting the second portion of the second symmetric key based on a user-selected identifier to produce an encrypted second portion of the second symmetric key.

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