Yep.... you sure can...... An eBay account reportedly sold over 100 fake COVID-19 vaccination cards in two weeks
Or like a printer.....
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While, I think, at least in Coz, there is some degree of verification on the test results, as the actual testing companies are operating in the same county vs a vax card from some other country? I could be wrong. Maybe you can just as easily fake a test result?
Unless they are verifying the test results, which highly unlikely considering the amount of passengers on each flight, it would be just as easy to make fake COVID tests. It is a piece of paper, an email, or a website. So either way you are operating on faith IMO.
"They"? The way it is supposed to work is you go to your bank and ask for the bank's site SSL certificate on a clean freshly baked CD. (USB devices come with auto-play drivers/firmware that can't be tested/cleaned with regular antivirus software and are therefore unsuitable.) Now if in your bank "they" know what the above even means, and are able to give you the goods, do you know how to import that cert into all your browsers?