You specifically wrote "sent in plaintext", which is factually incorrect. Telegram messages are never sent in plaintext. But to address your digression: Cloud

You specifically wrote "sent in plaintext", which is factually incorrect. Telegram messages are never sent in plaintext. But to address your digression: Cloud Chats (as opposed to E2EE Secret Chats) are both encrypted in transit and at rest [1]. The difference between the MTProto implementation between Cloud Chats and Secret Chats are, at a very high level, that part of the encryption key is held by Telegram. To be unequivocally clear, at no point are Cloud Chat messages ever stored in plaintext or sent in plaintext. [1] https://core.telegram.org/mtproto#authorization-and-encryption https://core.telegram.org/mtproto#authorization-and-encrypti...