> The most secure messenger with Signal protocol is no arguably Signal Messenger, besides end-to-end encrypted messages, almost all metadata are also encrypted. whistleblowers, privacy advocates, journalists, and security technologists all recommend Signal as the most secure messenger.<p>The signal protocol and its implementation 'libsignal' are cryptographically secure compared to the alternatives mentioned in the authors blog post. The only problem I have is the client application.<p>Just like Telegram, phone number sign up in the default application is required which is still a gigantic turnoff, given that the phone numbers used for verification could be stored on a third-party SMS service, which is a shame for 'privacy'.