I think so.
https://simplex.chat/blog/20240314-simplex-chat-v5-6-quantum-resistance-signal-double-ratchet-algorithm.html
Does Keychat use post-quantum encryption?
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No, Keychat uses the same libsignal codebase as the Signal app.
Signal added a post-quantum key exchange: https://signal.org/blog/pqxdh/
