

90GB of both RAM+NAND combined. I’m guessing most of it is actual persistent storage for all the stuff the infotainment system uses (including imagery and offline map data for GPS, which is probably a big one), rather than actual memory in the sense of desktop computing.
Or, if the app has the private key for decryption for the user to be able to see the messages, what’s stopping the app from copying that decrypted text somewhere else?
The thread model isn’t usually key management, it’s more about the insecure treatment of the decrypted message after decryption.