MatrixRTC - The key sharing problem (matrix-conf-2025)

What this episode covers

Why is having large encrypted group calls difficult? How do other providers solve this? The future? Demos! Why are large encrypted group calls difficult to host? Specifically, we will go into the details about key sharing, how we can use some tricks to optimize it and how they are also a very big footgun. We will also see how other providers like jitsi, zoom, discord and cloudflare handle this. And then show off the new Famedly Call project! There will also be some mentions of MLS and how it fixes this problem and some caveats, therefore attending one of the MLS talks from before is recommended :D Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/QCYBMC/

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This episode is 17 minutes long.

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This episode was published on October 17, 2025.

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Why is having large encrypted group calls difficult? How do other providers solve this? The future? Demos! Why are large encrypted group calls difficult to host? Specifically, we will go into the details about key sharing, how we can use some...

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