The Triple Ratchet Protocol: A Bandwidth Efficient Hybrid-Secure Signal Protocol
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Presented at Real World Crypto 2025 by
Secure Messaging apps have seen growing adoption, and are used by billions of people daily. However, due to imminent threat of a "Harvest Now, Decrypt Later" attack, secure messaging providers must react know in order to make their protocols hybrid-secure: at least as secure as before, but now also post-quantum (PQ) secure.