Briar

Briar is a messenger based on secure Tor networks, as well as Wi-Fi and Bluetooth.

The application uses a peer-to-peer system with no central servers for data transfer, so the service cannot be blocked by taking away servers. Thus, participants exchange messages directly with each other through end-to-end encryption. The messenger uses Tor protocols by default. If the government blocks this onion routing, the app will continue to function via nearby Wi-Fi and local Bluetooth networks.

It is designed for activists, journalists, and anyone else who needs a safe, simple, and reliable way to communicate. Unlike traditional messaging tools such as email, Twitter, or Telegram, Briar does not depend on a central server — messages are synchronized directly between users' devices. If the Internet is down, Briar can sync via Bluetooth or Wi-Fi, enabling information transfer during crises or rallies. It is fully decentralized, confidential, encrypted and open source.

Open source: https://code.briarproject.org/briar/briar Questions about non-complete security basics/errors/problems can be asked here: https://code.briarproject.org/briar/briar/-/issues List of all changes in Briar: https://code.briarproject.org/briar/briar/-/wikis/changelog Official developer's website: https://briarproject.org The official Briar repository for F-Droid: https://briarproject.org/fdroid/repo?fingerprint=1FB874BEE7276D28ECB2C9B06E8A122EC4BCB4008161436CE474C257CBF49BD6 You can also support the developer financially with bitcoin or cash: https://liberapay.com/~34745, 1NZCKkUCtJV2U2Y9hDb9uq8S7ksFCFGR6K, https://flattr.com/thing/592836