• FiskFisk33@startrek.website
      link
      fedilink
      arrow-up
      3
      ·
      edit-2
      12 hours ago

      A guess/suggestion:

      You have an app with a private key. The qr code contains data encrypted with the corresponding public key. Your app decrypts the data and transmits it to googles servers, proving you are in possession of the secret key.