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Replacement of keys

  • US 20100215180A1
  • Filed: 06/11/2008
  • Published: 08/26/2010
  • Est. Priority Date: 09/25/2007
  • Status: Abandoned Application
First Claim
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1. A method for assigning a key to a device, the method comprising:

  • providing a device having a processor ID (CID) and an associated processor key (CK) and comprising a memory;

    at a first time, storing a personalization data ID (PDID) and associated personalization data (PD) in the memory;

    at a later time, sending the CID and the PDID to a security provider and receiving an activation value (AV) back from the security provider, the activation value AV being based, at least in part, on the CK and a personalization data key (PDK) associated with the PDID and the PD;

    computing, in the device, a result, based, at least in part, on the CK and the activation value, the result being produced by applying a first function g to the CK and the AV, such that the result=g(CK, AV); and

    storing the result in the memory,wherein a second function ƒ

    is used to compute the value of AV, such that AV=ƒ

    (CK, PDK), and f comprises an inverse function of function g, such that g(CK, ƒ

    (CK, PDK))=PDK,thereby assigning the personalization data key PDK to the device.

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