>Telegram claims that E2E encryption cannot be extended to group chats for backup reasons: to keep the highest level of security, messages from Secret Chats are

>Telegram claims that E2E encryption cannot be extended to group chats for backup reasons: to keep the highest level of security, messages from Secret Chats are not stored after delivery. Hence, if a phone is lost, the content of Telegram’s Secret Chats is lost. This sounds like a feature to me. Keeping old messages conveniently available to the user means they are conveniently available to an attacker. This is particularly important on a device like a smart phone that keeps everything conveniently available to the user all the time. This way of doing things does in fact make those Secret Chats more secure than Signal's regular chats in practice.