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Signal Protocol and Post-Quantum Ratchets
(signal.org)
This is a most excellent place for technology news and articles.
Considering Signal has been subpoenaed several times and proven in court the only thing they can give the feds is:
I don't think it'd be in their best interest to lie to the feds 6 times. You can quite literally read the subpoena for yourself, such as the most recent one in August 2024, which is only 2 pages long.