> Losing connection for extended periods of time can get in the way of "timely" key updates but they won't cause the encryption to fail.
To be fair, if the car is offline while a newly installed app logs in, then the app won’t be able to locate the car until the car checks in. Which is not actually the end of the world, and there are ways to mitigate this. (See iMessage and Keybase for a couple of different approaches to this. See Signal for a shockingly poor group of bizarrely mutually incompatible solutions that barely work. I think that Matrix tries, too. MLS should be able to handle it, and piggybacking off an existing standard like MLS might be entirely reasonable albeit dramatically more complex than the simple solution I outlined.)
To be fair, if the car is offline while a newly installed app logs in, then the app won’t be able to locate the car until the car checks in. Which is not actually the end of the world, and there are ways to mitigate this. (See iMessage and Keybase for a couple of different approaches to this. See Signal for a shockingly poor group of bizarrely mutually incompatible solutions that barely work. I think that Matrix tries, too. MLS should be able to handle it, and piggybacking off an existing standard like MLS might be entirely reasonable albeit dramatically more complex than the simple solution I outlined.)