

By default, yes. It is possible to create a so-called secret chat, which is standard for signal and similar, but that’s something you have to manually do. Furthermore, it’s not even possible to make secret chats for groups. When it was initially released, I was cautiously optimistic that it could turn into a good, secure application, but knowing it’s been this long and it hasn’t, I wouldn’t consider that likely.





I’m not entirely sure what you’re trying to say here. To clarify, telegram uses a store-forward architecture, meaning that it deletes messages from the server once they have been received by everyone. Until that time, the messages are stored on the server in plaintext, unless you’re using a secret chat. They do this to avoid having to exchange keys between different clients, but what that really means is that it isn’t actually private most of the time.