ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,401,499, issued on Aug. 26, was assigned to GM Global Technology Operations LLC (Detroit).

"Symmetric key attestation of removable circuits" was invented by Brian Farrell (Troy, Mich.), Christopher J. Kloote (Livonia, Mich.), Manohar Reddy Nanjundappa (Cedar Park, Texas) and Kenneth W. Junk (Marshalltown, Iowa).

According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus includes a compute device having a microcontroller unit circuit, multiple processing circuits, and a backplane bus. Initial unsecured communications through the backplane bus are restricted. The microcontroller unit circuit is operational to authenticate the processing circuits with a plu...