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by frabcus
1591 days ago
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This page gives some details and the technical reason can be inferred: https://support.signal.org/hc/en-us/articles/360007061452-Do... It doesn’t send the number to them - Signal don’t get the contact list from your phone. It uses a very clever private contact discovery protocol. The reason their phone has to know is so that they can then message you. Otherwise there would be no way to message people - a phone has to know who is on Signal to be able to do that. While the notification could be off by default, since the phone necessarily has to know when your contacts are on Signal for the app to function, it is being transparent about the privacy situation. Details of the private contact discovery system: https://signal.org/blog/private-contact-discovery/ |
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