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Signal Protocol and Post-Quantum Ratchets
(signal.org)
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this post was submitted on 03 Oct 2025
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Contact info gets hashed in a clever way which doesn't send your info (although i guess phone number hashes could be brute forced?) Meta data is also not available. They have no way to know who you are talking to. The only info they have is that you logged ij with a ip at a time. I believe they can't even reliable track how many messages you send. Even with a compromised server most of the magic happens in the open source client side app so that they can't gather very much. I understand your concerns about popular centralized services but i really believe that they are unfound with signal.