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I work at Signal and wrote much of that code, so I'm familiar with it :). Yes, it uses a server for media distribution and uses encryption keys that the server
by pthatcherg 6y ago
I work at Signal and wrote much of that code, so I'm familiar with it :).
Yes, it uses a server for media distribution and uses encryption keys that the server does not know.
- dbrgn 6y agoThanks! Since I've also written a lot of audio/video call code, it's always interesting to learn about design choices of other applications. Do you rotate the group key regularly and/or on group events (e.g. a person leaving the group call)? What SFU do you use, and did it require custom modifications? Or is it even a fully custom server-side solution?
- pthatcherg 6y agoWe rotate the keys whenever someone joins or leaves, although the mechanism is more efficient when someone joins than one someone leaves. I don't think we've made the SFU repository public yet, so I don't think I can comment on that yet. Likely I'll be able to in the future.