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In the key agreement, contact exchange and introduction protocols we refer to the master key. In the transport protocol we refer to the root key. When adding a contact in person, the key agreement protocol's master key is used as the transport root key. When a contact is introduced, the introduction protocol's master key is used as the transport root key.
Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. Unlike traditional messaging tools such as email, Twitter or Telegram, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices. If the Internet's down, Briar can sync via Bluetooth or Wi-Fi, keeping the information flowing in a crisis. If the Internet's up, Briar can sync via the Tor network, protecting users and their relationships from surveillance.