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Why Signal’s post-quantum makeover is an amazing engineering achievement
(arstechnica.com)
This is a most excellent place for technology news and articles.
Because Matrix barely works half the time and has some significant security/privacy flaws still. One of which is: if there's a bug that makes it possible for someone to snoop your metadata and the fix requires a server update... You're SOL if the people you're talking to don't get the update.