Am I the only one that finds it disturbing that @whispersystems pushes a notification when a contact becomes a user of Signal?
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But how does it find out that a contact is a user? Is it querying in the background?
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Yes, periodically transmits a truncated hash of the number in the background. Nothing is stored server side:https://whispersystems.org/bigbrother/eastern-virginia-grand-jury/ …
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Cool. Thanks!
End of conversation
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