PKD – Procedural and Technical Information
The PKD Interface Specifications are provided to prospective PKD Participants after submission of their Notice of Participation to the ICAO Secretariat and payment of the Registration Fee.
Some technical information such as generic Interface Specifications may be made available to prospective PKD Participants upon request.
Procedural documents relating to the operation of the ICAO PKD, including the
Regulations for the ICAO Public Key Directory and the
Procedures for the ICAO Public Key Directory are available for download at
The management of these various technical documents, including considering and approving amendments to them, is the responsibility of the PKD Board.
Automated Border Control (ABC) systems can significantly improve efficiency and security of border management processes when properly implemented. In order for such benefits to be realized, it is vital that electronic Machine Readable Travel Documents (eMRTDs) presented to ABC systems are fully validated and that the digital signature is properly verified. There is, as a result, an important link between deployment of ABC systems and participation in the ICAO PKD.
ICAO Annex 9 Recommended Practice 3.34.5 indicates that data from the PKD should be used to validate eMRTDs during their processing in ABC systems.
In order to allow State authorities, airport authorities and other interested parties to undertake a cost-benefit analysis for the deployment of ABCs in their facilities, ICAO has developed a Cost-Benefit Analysis Tool for ABC systems. Further information on this tool is available here.