Do P2P Messaging apps that don't require the internet exist? (lemmings.world)

submitted 10 hours ago by Ju135@lemmings.world to c/privacy@lemmy.ml

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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.

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[-] IDKWhatUsernametoPutHereLolol@lemmy.dbzer0.com 3 points 5 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.

Use SSE to encrypt text
Copy-Paste the Ciphertext to Rattlegram
Sent it over the radio
On the other end, use Raddlegram to turn the audio back to the ciphertext
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)

this post was submitted on 30 Jan 2025

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