> For example CAN does not have a notion of source, it's really in the abstract a whole lot like a bus, just with cables. I get that. And if it did, the attack

> For example CAN does not have a notion of source, it's really in the abstract a whole lot like a bus, just with cables. I get that. And if it did, the attack would by spoofing that. Which is why the solution needs to filter what goes onto the bus - at the only point the source is known. > When it was all a wired network, it did not really matter so much. Well, consider if I told you there was a way to "cut the brakes" (at a future date, when the car is at speed, etc) on any car you've been in, without any tools needed or evidence left. Untraceable murder. It's only the scope of the current attack that makes that look minor.