this post was submitted on 14 Mar 2025
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How would you make an arbitrary QR code have a verifiable signature?
I can see a system where you have to scan the QR code in a specific app for that purpose (e.g. a dedicated QR code payment app which approved businesses sign up to, which either includes or remotely queries a database of valid endpoints). At that point though, where you're requiring a dedicated app anyway, you may as well invent your own 2D code system with blackjack, hookers and signing. But yeah, I don't understand how this would work otherwise. QR codes just aren't made for security. They shouldn't be used anywhere security is required.
Well, by using a QR code you don't have to invent your own 2D system, as blackjack and hookers aren't really necessary.
Just make your own URI protocol, and encode any signature in the link. Bonus if you can register your protocol in Android or IOS, but I don't know if this is possible.
Apps an indeed register URL schemes with their domain or chosen protocols to open by default on Android.