I think there's still value in hiding the conversation from the server even if you must still trust the server to not behave maliciously. If some three-letter a

I think there's still value in hiding the conversation from the server even if you must still trust the server to not behave maliciously. If some three-letter agency contacts the server operator asking for a back channel to listen in, he or she could respond that it's not possible without malicious intent towards a user: http://www.macobserver.com/tmo/article/apples-imessage-encryption-too-tough-for-fbi http://www.macobserver.com/tmo/article/apples-imessage-encry...