this post was submitted on 09 Nov 2021
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Privacy
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I'm guessing that you and your contacts exchange MAC and Onion addresses. Then Briar looks for that MAC address via WiFi/Bluetooth or an Onion address on Tor.
I've watched a video where Torsten Grote explains some of it. In fact you're right when you say it uses the onion address on Tor (I also had assumed that). But he doesn't explain how the contacts exchange work on a local LAN. I'm not sure it uses the MAC addresses because those are not reliable in the sense that they can be easily spoofed. But maybe I'm wrong because in the end what counts is if the device know the private key or not. Here's the video: https://media.ccc.de/v/34c3-8937-briar