Long range (LoRa) mesh networks are interesting alternatives to communication, especially when state actors are blocking internet access for various reasons.
More details about meshtastic: https://meshtastic.org/
About its current state of encryption: https://meshtastic.org/docs/overview/encryption
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Here’s a video with a lot of guidance and examples of use: https://youtu.be/EAQI2ZSmxPU?si=lF5xr8fKyCRHEk7F
That’s the video in this post