I'm continually impressed with how much good, new cryptography the Signal community keeps researching and developing to ensure that services can know as little about their users as possible https://signal.org/blog/signal-private-group-system/
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@micahflee yet they still rely on phone number as UUID. Seems pretty unsafe.
@Joshua yup, it's something many of us have been asking for for a long time. I know they're working on something, but no idea when it will be ready