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On Reddit's r/privacy, you can no longer criticize Facebook
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this post was submitted on 25 Mar 2025
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The comment that you replied to does not imply the phone number can be used to decrypt messages. All they are saying is that because Signal accounts are tied to phone numbers, a potential adversary already has one piece of the puzzle (who is talking to whom). If somehow, some way, the encryption were ever compromised, then the adversary would have both pieces—in other words, they would know not only who is talking to whom but also what they are saying.
If the encryption is ever hacked, knowing who you are is probably the least of anyone's concerns. I would imagine that any adversary could build a profile or plan a response without knowing a particular phone number.
"These two people are planning civil rights activism here on Friday," is just as useful as, "MLK Jr and Malcolm X are planning activism here on Friday."
Thankfully, they'd have to not only break encryption but also MitM the conversations, since Signal doesn't actually store chat data on their servers.