this post was submitted on 16 Jan 2025
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:D same. I think the solutions could be applied elsewhere too. They'd be very interesting.
That depends on the client. Some clients will exit, some will stay in the room. Encrypted matrix rooms use "perfect forward secrecy", meaning new people can't read the past, and old people removed from the group/chain/chat cannot read new messages. So, being kicked from a room would still allow you to see all the chat history you stored. Or if you sign in with a device that didn't get the "kick" message yet, the server could still send you all the messages up until the point of the kick message.
I'm not sure how Matrix implements it and server + client implementations can differ.
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Perfect backwards secrecy what be a trade-off I'd personally be fine with. To speculate a bit, the fact it's a 2 person room in the Futo Circles case inplifies things a bit. Your keys are different with every single person. It's like sending a mass e2ee message to every single contact you have, just that it's only fetched from the server if they go looking.
Having to re-encrypt stuff does seem like the biggest downfall here (if this understanding is even correct 😅)
This is indeed a complicated question, thanks for taking the time to respond :)