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SECURE EXECUTION ENVIRONMENT ON EXTERNAL DEVICE

  • US 20090292919A1
  • Filed: 05/23/2008
  • Published: 11/26/2009
  • Est. Priority Date: 05/23/2008
  • Status: Active Grant
First Claim
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1. One or more computer-readable storage media that store executable instructions to perform a method of interacting with a machine, the method comprising:

  • receiving, from said machine, a request that, when carried out, causes a device on which said instructions execute to perform an action;

    verifying said machine'"'"'s identity;

    querying said machine as to said machine'"'"'s execution state, wherein a component of said machine reports said machine'"'"'s state based on one or more values that are stored in registers that (a) are reset whenever said machine is booted, and (b) are resistant to being set to arbitrarily-specified values during operation of said machine;

    determining that said machine'"'"'s state, as reported by said component, satisfies one or more criteria; and

    based on said determining, performing said action.

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