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Apparatus and method for secure filed upgradability with hard wired public key

  • US 7,131,001 B1
  • Filed: 10/11/2000
  • Issued: 10/31/2006
  • Est. Priority Date: 10/29/1999
  • Status: Expired due to Fees
First Claim
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1. An apparatus for enabling functionality of a component, said apparatus comprising:

  • an identification module, said identification module having an identification number stored therein;

    a hash function module in communication with said identification module;

    a host in communication with said identification module, said host being configured to communicate with a manufacturer to request a guess passcode corresponding to the identification number stored in said identification module;

    a guess register in communication with said host;

    an encryption module in communication with said guess register;

    a public key module in communication with said encryption module, said public key module having a public key stored therein;

    a comparator in communication with said encryption module and said hash function module, wherein said comparator compares a first bit string to a second bit string to generate a function enable output for the component, and wherein said first bit string comprises a ciphertext bit string generated by the encryption module and said second bit string comprises a hash value generated by said hash function module; and

    a selecting device for selecting at least one of the function enable output and a bonding option output, said selecting device comprising an OR gate having at least one input for receiving said function enable output and the bonding option output.

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