Under the new system, the personal identification number will be automatically generated when citizens apply for new ID cards. The number will appear physically on the card and be digitally embedded in its chip, with data maintained in a centralized registry by the Digital Governance “>General Secretariat for Information Systems and Digital Governance . 

Source: https://idtechwire.com/greece-mandates-digital-id-numbers-on-new-national-identity-cards/