EU Digital COVID Certificate

[1] The EU Digital COVID Certificate was created to facilitate travel within the European Union.

[2][3][4] By December 2022, the member states had issued more than 2 billion EU Digital COVID Certificates.

[1] It was usually supplied in the form of a QR code, either contained in a PDF file, or as a printout.

To check the validity of the EUDCC, special software was required which scans the QR code and verifies the digital signature, for example the mobile application CovPassCheck-App.

The resulting data is compressed with zlib and encoded into the final QR code.