In September last year, the Free Software Sydney meet-up group had an inaugural Jitsi Meet videoconference.
My (longer-than-planned) contribution to the conference aimed at introducing trust and security concepts, mainly in showing the prevalent role of hashes, and covered public-key cryptography uses, GPG, SSL CAs, trusting trust and reproducible builds.
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The whole video of the conference, also covering Free Software and Tor, can be found on the page of the event. PDF slides are available here.