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Signal downplays encryption key flaw, fixes it after X drama
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this post was submitted on 12 Jul 2024
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It's better now, but for years and years all they used for contact discovery was simple hashing.. problem is the dataset is very small, and it was easy to generate a rainbow table of all the phone number hashes in a matter of hours. Then anyone with access to the hosts (either hackers, or the US state via AWS collaboration) had access to the entire social graph.
Yeah the way I remember it, they put a lot of effort into masking that social graph. That was a while back too, not recent.
What I'm saying though is that for the longest time they didn't, and when they changed the technique they hardly acknowledge that it was a problem in the past and that essentially every users social graph had been compromised for years.
Did it get leaked or something?