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Well, if you look at computers, which cars kind of are, there's a trend to go from "security from obscurity" to full blown locks and encryption.
Take a look at how Microsoft is pushing for all Windows 11 computers to have a Trusted Platform Module (TPM, not to be confused with Tire Pressure Monitor) version 2.0 or newer with secure boot. If they can encrypt hard drives and everything else with secret keys then it becomes a lot harder to hack computers.
The same with cars. If the tele data isn't so already, it will be soon encrypted. I'm sure CAN bus and all that is going to go the same route too if it hasn't. Soon sensors will have encryption chips and send encrypted digital data instead of analog voltage signals like they do now.
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