this post was submitted on 14 Mar 2025
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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.
I get what you're saying but it's at least a little bit funny that they are regularly used for security in the form of scan to login (e.g. Steam), verify your session (e.g. Matrix), etc. Of course these are in a closed ecosystem so the QR code itself is not the security. But I just found it funny you said that when 90% of my QR code usage is for security.
I mean, generating a one time QR code for login is one thing. It's the equivalent of a one time password. But a permanent QR code is not that. They still aren't inherently secure, but they can be used in situations where showing a code in plain text would be just as secure.
Yeah, my language was overly broad. You can use QR codes as part of a system where the security is going on elsewhere, but the integrity of the QR code itself isn't something that can be relied on for security.