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Computer system apparatus and method for improved assurance of authentication

  • US 7,085,933 B2
  • Filed: 06/11/2002
  • Issued: 08/01/2006
  • Est. Priority Date: 06/11/2002
  • Status: Active Grant
First Claim
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1. A method comprising the steps of:

  • initiating the operation of a computer system having trusted computing platform capabilities;

    executing code stored accessibly to the computer system to transition the computer system first to a state of presenting a secure virtual machine;

    said code, when executing on said computer system while in the secure virtual machine state, retrieving data stored in a platform configuration register and then locking the retrieved data against subsequent access by any virtual machine instantiation subsequently initiated;

    said code, when executing on said computer system while in an insecure state, responding to a user request for initiation of authentication of a file by transitioning the computer system to a secure machine state, announcing to the user entry into the secure machine state, and deriving from the locked data keys for authentication of the file.

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