Patents by Inventor Christopher E. FENNER

Christopher E. FENNER has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Ex post facto platform configuration attestation
    Patent number: 11431752
    Abstract: Implementations described herein disclose a platform configuration register (PCR) attestation system using a trusted platform module (TPM) of a device. The PCR attestation system provides one or more computer executable instructions to create a non-volatile (NV) index in a TPM of the computing device, with a PCR policy specifying that the values of PCRs on the TPM are equal to predetermined set of values, and if the PCR policy is satisfied, setting a value of an NVWritten attribute to specify that the PCR policy was satisfied since the last time the device booted.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: August 30, 2022
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Christopher E. Fenner
  • Attestable and destructible device identity
    Patent number: 10917237
    Abstract: Implementations described herein disclose a device identity management system using a trusted platform module (TPM) of a device. The device identity management system provides one or more computer executable instructions to receive a secret random number at a trusted platform module (TPM) of a device, generate a hash of an existing device identity stored in a non-volatile (NV) identity index using the secret random number, and store the hash as the device identity in the NV identity index.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: February 9, 2021
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Christopher E. Fenner
  • EX POST FACTO PLATFORM CONFIGURATION ATTESTATION
    Publication number: 20190394241
    Abstract: Implementations described herein disclose a platform configuration register (PCR) attestation system using a trusted platform module (TPM) of a device. The PCR attestation system provides one or more computer executable instructions to create a non-volatile (NV) index in a TPM of the computing device, with a PCR policy specifying that the values of PCRs on the TPM are equal to predetermined set of values, and if the PCR policy is satisfied, setting a value of an NVWritten attribute to specify that the PCR policy was satisfied since the last time the device booted.
    Type: Application
    Filed: June 22, 2018
    Publication date: December 26, 2019
    Inventor: Christopher E. FENNER
  • ATTESTABLE AND DESTRUCTIBLE DEVICE IDENTITY
    Publication number: 20190319790
    Abstract: Implementations described herein disclose a device identity management system using a trusted platform module (TPM) of a device. The device identity management system provides one or more computer executable instructions to receive a secret random number at a trusted platform module (TPM) of a device, generate a hash of an existing device identity stored in a non-volatile (NV) identity index using the secret random number, and store the hash as the device identity in the NV identity index.
    Type: Application
    Filed: April 16, 2018
    Publication date: October 17, 2019
    Inventor: Christopher E. FENNER