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Method and apparatus for providing bus-encrypted copy protection key to an unsecured bus

  • US 20020164022A1
  • Filed: 03/02/2001
  • Published: 11/07/2002
  • Est. Priority Date: 03/02/2001
  • Status: Active Grant
First Claim
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1. A method for providing a bus-encrypted copy protection (CP) key to an unsecured bus, the method comprising steps of:

  • exchanging, between a first processor and a second processor, public keys that are shorter in length than public keys used to originally generate a copy protection key, over the unsecured bus to develop a shared secret bus encryption key, the shared secret bus encryption key having a first length;

    generating, by the first processor, the CP key;

    encrypting, by the first processor, the CP key using the shared secret bus encryption key and a symmetric encryption algorithm to produce a bus-encrypted CP key; and

    providing the bus-encrypted CP key to the unsecured bus for the second processor.

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