I detect horseshit. Cc @Pinboardpic.twitter.com/PpgLMcVZJA
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they do a pretty elaborate dance to keep from storing the hashes too long, too, since it’s easy to guess phone number hashes
indeed, reversing phone number hashes is trivial.
from (very cursory) look at Signal source, seems contacts regularly re-uploaded to expand in-app list, &…
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