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Method and apparatus for protected exchange of status and secret values between a video source application and a video hardware interface

  • US 6,920,221 B1
  • Filed: 03/31/2000
  • Issued: 07/19/2005
  • Est. Priority Date: 08/29/1999
  • Status: Expired due to Term
First Claim
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1. In a video source device, a method comprising:

  • a video source application requesting from a video hardware interface status with respect to a link linking said video source device to an external video sink device, and supplementing said status request with a first basis value to a symmetric ciphering/deciphering process;

    the video source application receiving from said video hardware interface said requested status and a verification key, generated through said symmetric ciphering/deciphering process employing said first basis value; and

    the video source application verifying the correctness of said verification key to determine whether to trust said provided status.

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