trnck.dev
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it's most likely not a thesis, Ithink
authored by
Filip Troníček
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GitHub
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_posts/2025-11-30-instant-messaging.md
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_posts/2025-11-30-instant-messaging.md
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I chose to focus mainly on the encryption and data formats behind these protocols, as I thought the three would make an interesting comparison. Learning about how Signal does key derivation and how it can guarantee both forward secrecy and post-compromise security, my mind was truly boggled (in other words, I learned a lot).
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You can find the thesis as PDF [in Czech] [here](/static/Instant%20Messaging.pdf).
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You can find the paper as PDF [in Czech] [here](/static/Instant%20Messaging.pdf).
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The scope of the paper sadly limited the space to dive too deep into all of the protocols, but I was at least glad I was able to connect instant messaging with my love for <abbr title="Post-Quantum">PQ</abbr> cryptography – not only was I able to talk about <abbr title="Post-Quantum Extended Diffie-Hellman">PQXDH</abbr>, the quantum-resistant key agreement protocol we briefly touched on [more than 2 years back](/hello-internet/), but as it turns out, there is a new way the brilliant engineers behind the Signal messenger created to make messaging even more complex.
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