A place to discuss privacy and freedom in the digital world.
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
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https://en.wikipedia.org/wiki/Double_Ratchet_Algorithm
This is the encryption that they developed. Whatsapp and OMEMO (XMPP) use it as well. It has forward secrecy because if an attacker has the key for a message they can’t calculate the key for the key for the next message etc.
@sexy_peach So when I understood it right (just skimmed the text), the encryption keys changes per message?
Double Ratchet Messaging Encryption - Computerphile
https://youtu.be/9sO2qdTci-s?si=qPbDZ2-x_VSiEZ-1
Here is an alternative Piped link(s): https://piped.video/9sO2qdTci-s?si=qPbDZ2-x_VSiEZ-1
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I’m open-source, check me out at GitHub.
essentially, yes. There are two levels of encryption keys and they “ratchet” along (change). Only the lower level is used to encrypt the text so it’s much harder to figure out the other one.
@sexy_peach Thank you very much! Just now wondering, handle WA this differently? Since Ig we all know this message which appears when the “keys” ig, changed
I don’t know if I fully understand you here.
To my understanding whatsapp does it like this too. The key changing must be the high level key, since the message means that it’s an unknown key (thus not yet trusted). From new install or new device.
@sexy_peach Okay, got it, ig.