this post was submitted on 06 Oct 2024
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Privacy
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Depends, who do you want to shield what information from? Signal knows all of their users’ phone numbers. You can hide it from other Signal users. All depends on your threat model.
Only the hash of your phone number.
How exactly is it hashed? There aren't that many possible phone numbers, so it might be viable to just try every valid number until you find one that matches
Here's what Signal says: https://signal.org/blog/contact-discovery/