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It looks like it's the public part of your endorsement key used by TPM to verify your TPM is the original one used by the manufacturer. There isn't much information about what that particular EFI variable is used for though, here's some useful information:


  1. Digging into the HardwareHash and the OfflineDeviceID
  2. How Windows uses the TPM
  3. TPM Key Attestation


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