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Funfact: that’s not a simple solution as it sounds at first. It start to become very complex and expansive when you start looking at it in detail. It starts with costly crypto support at the microcontroller. It goes with complex key agreement protocols. Then everything needs to be unique for each and every car. Because of you don’t do all of this, you can defeat everything very easily.

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It doesn't have to be that complex. Enough HW crypto support exists in smaller and smaller MCUs. A good enough PSK programmed at the factory would probably be enough and that's the only thing that needs to be unique, everything else can be off-the-shelf vehicle-class components and open source.

Btw it's "fun fact" and it typically means there is something factual, not just guesswork.

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