I used lvm with SSD cache few years, but time to time I have problems with loads after reboot. If forgot about reboots all work great with LVM raid + LVM cache. Cache can be configured without raid. And you can add or remove cache in any time. Docs: https://man.archlinux.org/man/lvmcache.7
So, that’s why they call PUBLIC chats in first place. In private chats all work exactly like in signal (DH end-to-end crypto with key verifying). But after 5 years some journalist finally read the documentation and newspapers was exploded. I known that from first day.
Telegram also honestly declares that there is no need to rely on anyone in matters of privacy. For example: We do not store customer IP, says signal developers. And how should I check it? Teleram just honestly says, “You have an mtproto proxy, build any kind of proxying chains and we won’t even theoretically know your address.” Feel the difference.
And I still don’t understand why MITM can’t just match two DH keys so that Alice and Bob’s signature checks match. But maybe I just don’t understand the cryptography chain well.
I don’t want tell that signal have bad crypto or telegram greates private messager. I say that all of that messengers have same security in private messages. Yes, signal support group private chats too, but that’s all. And if anyone can’t read docs, that not a telegram problem.