With the recently introduced SecOC (Secure Onboard Communication) standard, car manufacturers seek to make the CAN bus networks that form the backbone of modern day cars more secure. This standard adds a MAC (message authentication code) to the CAN messages, which can be used to validate that these messages come from a genuine part of the car, and not from a car thief or some third-party peripheral.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/03/08/extracting-secoc-keys-from-a-2021-toyota-rav4-prime/