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Re:What can you use instead of Google and Facebook? by edraferi on Friday January 24, 2020 @02:22PM (#22141544)
How do you deliver end-to-end encryption in a federated architecture like that?
Re:What can you use instead of Google and Facebook? by dnpp123 on Friday January 24, 2020 @02:56PM (#22141850)
You can peek at : https://matrix.org/docs/develop/ tldr; similar to signal afaik

The docs there for E2E are fairly old but get you an idea how it works. E2E has improved a lot in the last few months IMHO.