this post was submitted on 28 Aug 2024
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Privacy
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What are you talking about? you get a phone number from signal, and what will you be able to derive from it? there is no graph. signal does not hold any "relationships" information.
The phone number is a unique identifier for your account. When you send a message to another user on Signal, that message goes to the server, and then gets routed to the other party. The server therefore has to know which parties talk to each other. Let me know if you have trouble understanding this and need it explained in simpler terms.
Youre right, thats how it works in almost all messaging apps. But signal implemented sealed sender specifically to counter this.
You can read more about it here: https://signal.org/blog/sealed-sender/
I encourage you to read the first paragraph, which is important in the context of our conversation.
Anyone who has worked with centralized databases can tell you how useless that is. With message recipients and timestamps, its trivial to find the real sender.