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Regarding your proposed scheme, what's to stop me taking a screenshot from the app and sharing it with all my friends? If the QR code contains no personal info

• pzo 5y ago
  You would have to share your phone which you are probably less likely. Scanner doesn't need to know who the code was generated for only if this is a legit authorized app - it's easy to check if this is a real app with some challenge-response instead of one way-communication
• mmcnl 5y ago
  The QR code has the first letters of your fist and last name, as well as date of birth (without the year). Let's say your name is Gerrit de Winter, born May 3 1973. The QR code would then contain: G W 5/3 Nothing is stopping you from sharing the code with your friends as long as they share these limited credentials, but those chances are very small. It's easier to get a valid QR code than finding a credential twin.