We all know Signal, Matrix, Telegram, SimpleX, etc… But if you can’t access the internet you can’t communicate. Pretty logic. But would it be possible, at least theoretically, to create an app that permits to message people even if the internet goes down?

It might be a dumb question I really have no idea to be honest.

  • Mr. Zeus@feddit.orgEnglish
    3·
    6 hours ago

    wouldn’t a cheap walkie-talkie be more practical in that situation?

    That’s not secure or encrypted

    • ERROR: Earth.exe has crashed@lemmy.dbzer0.comEnglish
      3·
      6 hours ago

      You can encrypt a radio.

      Rattlegram is an app on iOS/Android that alllows converting text to audio and play it over your phone’s speaker

      Secure Space Encryptor (SSE) (known as Paranoia Text Encryption on iOS) is an Open Source app that can encrypt text.

      1. Use SSE to encrypt text
      2. Copy-Paste the Ciphertext to Rattlegram
      3. Sent it over the radio
      4. On the other end, use Raddlegram to turn the audio back to the ciphertext
      5. Use SSE to decrypt.

      Voila! Off-Grid Encrypted communications.

      Warning: Encryption over radio is illegal in many countries 😉 (but fuck the law lol, who cares)