Messages are not fully encrypted by default. That means the company could, in theory, access the content of the messages, or be forced to hand over the data at the request of a government. Telegram Messenger Blocks Navalny Bot During Russian Election But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat. False news often spreads via public groups, or chats, with potentially fatal effects. In the United States, Telegram's lower public profile has helped it mostly avoid high level scrutiny from Congress, but it has not gone unnoticed.
from cn