Matrix Encrypted Criminal Hub Taken Down by Law Enforcement - https://www.redpacketsecurity.com/police-shut-down-matrix-encrypted-criminal-hub/
Matrix Encrypted Criminal Hub Taken Down by Law Enforcement - https://www.redpacketsecurity.com/police-shut-down-matrix-encrypted-criminal-hub/
Briar is an interesting messaging app that utilizes tor and can communicate locally in case larger scale networks are down or undesirable. The need for an always-on inbox might detract slightly, but if used for real-time event communication, it would be very secure and useful. Couldn't have been shut down in #Tahrir Square or Hong Kong's Umbrella Revolution. No reason bluetooth can't be secured like LTE and wireless, although perhaps more easily scanned for than cellular.
#LoRa (although not part of Briar) is also of interest for local communication and can serve as a method to carry encrypted messages.
https://briarproject.org/how-it-works
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 apps, 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, Wi-Fi or memory cards, 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.