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> FWIW, I was expecting something like "the mechanism is fundamentally flawed because the e2e encryption actually is designed in a way where the server can derive or find the key"

The mechanism wasn't intentionally designed that way. But the symmetric ChatKeys were created with Random(), seeded (at least partially) with time().

Thanks a lot, that's quite valuable!

I was hoping to introduce both new and old readers with the "Context" section, but it seems I failed at that. The new post contains all of the content of the previous one and extends it a bit, which is why I didn't link the old one.

I removed the "Context" section now and replaced it with two short sentences addressed at readers of the previous post. I hope this makes it easier for new readers.

Thank you! Fixed.