3 ms·
My friends often joke that a person who is checking our tickets is able to do precisely this mentally in their head – when that person is satisfied by seeing a
by yreg 3y ago
My friends often joke that a person who is checking our tickets is able to do precisely this mentally in their head – when that person is satisfied by seeing a QR code rather than scanning it.
It became very popular over here with the Green Passes (EU Digital Covid Vaccination Certificates). Waiters, etc. were supposed to check whether the guests are vaccinated, but 99% of them just demanded any random QR code to be shown to them, took a look at it and considered it done.
Unless we are a country of hidden math geniuses :)
- bluGill 3y agoIt would probably only take a week of training/practice for someone to get good enough to read them manually. Particularity if the vaccination codes have a common pattern - the same mask, format information and the like. I would expect you can look at a few areas to see if the person is vaccinated (though this wouldn't pick up on someone else's vaccinated status)
- mr_mitm 3y agoThere is a digital signature embedded in the QR code. No one can verify that in their head.
- bluGill 3y agoWe don't need to verify everything though, just extract the vaccinated/not field which is probably in the same location on every QR code (or at least it should be possible to make it in the same area), and maybe the name of the person the QR code is for.
- 418tpot 3y agoThe signature is the whole point of the QR code though, otherwise someone could just trivially create a QR code that has their name and "vaccinated = yes".
- tln 3y agoLOL, the EU's vaccination QR codes are 90+ modules wide, BASE 45 encoded and compressed.