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5min chapter
Messaging Layer Security (MLS) with Raphael Robert
Security Cryptography Whatever
The Spectrum of Ways to Design Secure Group Messaging Systems
The original signal way of doing it was essentially that if you wanted to create a group, you would come up with an unguessable secret just to get 128-bit numbers on what that. So MLS makes it possible to design secure membership protocols that don't depend on a server making same decisions about who's in the group. The one addition here is that when you receive a message, you also know, you know, who the sender thought they were sending it to.
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