this post was submitted on 15 Sep 2021
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Privacy
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If you use additional measures to protect yourself it becomes a bit more difficult to correlate the info, but they still also know when a specific client with a specific phone number connects to their network. So maybe they have to run that timing attack over a few hours, but the end result is the same.
Not to point out the obvious, but if someone uses a burner phone to initially setup their signal account, that is another big layer of privacy
Burner phones which barely exist outside USA.
Oh shit, well I had no idea. Hell, I know in China you used to easily get a burner number, but now it is restricted.. Well listen, that certainly changes the conversation.
Do you know if there are any pay-as-you-go phone plans in Europe ?
Yes, but nearly all countries require you to register the SIM cards with your government ID.
There are, but are linked to your personal ID which makes it not the same.
I don't think so. I didn't really fully understood how sealed sender worked until now and only trusted Signal to implement it properly. I'm currently reading this which explains how it works and it seems to provide similar guaranties to what I assumed. The server can only have the IP of the sender. There seem to be some issues, but it's not as trivial as you seem to think it is. They may also have implemented the mitigations since.