@mdhughes @julia yea it forces the user (a potential attacker) to work with ciphertext only, in my experience most symmetric ciphers are a lot less vulnerable when you don't give the attacker known plaintext/ciphertext pairs. So this is clearly a great security feature of Matrix. ooc: (I had all these problems until I migrated away from matrix.org, since then matrix just works, group chats and all)