Some modern vehicles with FlexRay have full-bus encryption, and very modern CAN systems usually use HMAC for security sensitive stuff like immobilizer and key c

Some modern vehicles with FlexRay have full-bus encryption, and very modern CAN systems usually use HMAC for security sensitive stuff like immobilizer and key commands. I think ADAS systems will probably use similar in the coming years as vendors become more concerned and upset with system tampering. But, yeah, overall, most vehicle control systems are far less evil than people seem to think. I think part of the issue is that the "vehicle hacking" community have managed to massively over-hype basic protocol / message reverse engineering.