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Loading data onto an electronic device

  • US 20060236111A1
  • Filed: 09/08/2003
  • Published: 10/19/2006
  • Est. Priority Date: 09/16/2002
  • Status: Active Grant
First Claim
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1. A method of loading data into an electronic device (101, 205), the electronic device comprising a data memory (102) for storing data items and a key memory (105) for storing at least one cryptographic key of a cryptographic public key mechanism, the method comprising loading (S1, S701) a factory public key (PuKF) into the key memory;

  • loading (S2, S702) factory software (SW) signed with a factory private key (PrKF) corresponding to the factory public key into the data memory;

    characterised in that the method further comprises loading (S4, S704) into the key memory a product public key (PuKP) different from the factory public key for verifying subsequent data items to be loaded into the data memory after delivering the electronic device to a customer, the subsequent data items being signed with a corresponding product private key (PrKP); and

    disabling (S705) the factory public key prior to delivering the electronic device to the customer.

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