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Signal knows who you’re talking to – Sane Security Guy
(sanesecurityguy.com)
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Kinda of a poor write up. I have my issues with this but signal doesn't really use phone numbers internally, it uses hashes of phone numbers. It's not as straight forward as this article makes it seem, and this is readily available information that the author could have found.
Hashing doesn't really do anything because there are too few possible phone numbers. Easy to bruteforce. See the researchers who enumerated the WhatsApp users database recently via the internet...