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In-reply-to » I am not familiar with the functionality of Telegram or Signal, but things I have heard about both make me skeptical of their entries in this document. Signal requires a phone number to sign up, and I believe that you can connect it to your contact list on your phone to find other people using Signal. If this is the case, wouldn't they have to store at least a hash of your phone number? Hashed information is listed elsewhere in the document.

@mckinley@twtxt.net

Signal requires a phone number to sign up, and I believe that you can connect it to your contact list on your phone to find other people using Signal. If this is the case, wouldn’t they have to store at least a hash of your phone number? Hashed information is listed elsewhere in the document.

Signal do this “discovery” of your contact list client-side only.

I’m not sure on the exact details of how your “Phone number” si used; but I do know, and this is publicly available data and knowledge that Signal go to great length to not store, collect or process any kind of metadata that goes through
Signal brokers. I believe the Signal broker servers are also open source too if
I’m not mistaken. Have a read through some of their recent blogs.

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