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The solution I just mentioned specifically avoids an internet connection or third parties. It's a self-signed cert you add to your computer's CA registry. 100% offline and independent of anything but your own computer and the router. The QR code doesn't require an internet connection. And the first standard I mentioned was designed for industrial devices.

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Not only would that set a questionable precedent if users learn to casually add new trust roots, it would also need support for new certificate extensions to limit validity to that device only. It's far from obvious that would be a net gain for Internet security in general.

It might be easier to extend the URL format with support for certificate fingerprints. It would only require support in web browsers, which are updated much faster than operating systems. It could also be made in a backwards compatible way, for example by extending the username syntax. That way old browsers would continue to show the warning and new browsers would accept the self signed URL format in a secure way.

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