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Computer system apparatus and method for improved assurance of authentication

  • US 20030229802A1
  • Filed: 06/11/2002
  • Published: 12/11/2003
  • 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;

    retrieving while in the secure virtual machine state data stored in a platform configuration register;

    then locking the retrieved data against subsequent access by any virtual machine instantiation subsequently initiated;

    initiating authentication of a file while the computer system is in an insecure machine state;

    responding to initiation of authentication by transitioning the computer system to a secure machine state;

    announcing to a user entry into the secure machine state; and

    deriving from the locked data keys for authentication of the file.

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