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this post was submitted on 27 Mar 2025
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Privacy
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A place to discuss privacy and freedom in the digital world.
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
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Out of band key exchange is great -as long as people can physically meet and exchange QR codes. In reality, they are often sent via less secure means. As always, the humans are the weakest security link.
Fair point, it always feels dirty to send invite-link through WhatsApp, the dominant messenger in EU.
How would one go to solve the invite problem? How does Signal handle this?
Phone number and trust-on-first-use for most people, with out-of-band fingerprint verification for the paranoid. It really depends on the threat model and the security practices/awareness of your colleagues, but a link shared on some social media or lower-security chat network is more vulnerable to a man-in-the-middle attack than a phone number for your average Joe. There are a lot of ways a person could get a manipulated invite link.