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this post was submitted on 08 Oct 2025
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Privacy
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Signal stores the hash of the phone number. So you can query them for a specific phone number, but are unable to figure out phone numbers based on the hashes (outside of brute force - trying every 12-digit phone number).
And after doing that, you learn "this person uses/used Signal", with no information about particular messages whatsoever.
Okay, I was not aware that it was only the hash of the phone number. I was under the impression that it was the phone number itself.