The International Civil Aviation Organization Public Key Directory (ICAO PKD) is a database maintained by the International Civil Aviation Organization holding national cryptographic keys related to the authentication of e-passport information.

The ICAO PKD content is open to the public, and can be downloaded for free at https://download.pkd.icao.int/.^[1]

The United Nations became the first non-state participant in October 2012, enabling issuing of e-UNLP, the electronic form of the United Nations laissez-passer.^[2]

In December 2014, ICAO reported the PKD as having 45 participants.^[3]

In 2015 the German Bundesdruckerei (German Federal Printing Office) won the request for tender of the ICAO to provide the ICAO PKD.^[4]

In July 2017, ICAO reported the PKD as having 58 participants.^[3]

As of November 2017, 60 participants were part of the ICAO PKD, with the European Union being the 60th member and at the same time the second non-state participant.^[3]

As of March 2024, 95 participants were part of the ICAO PKD.^[3]

• Passenger name record
• Passport
  • Biometric passport
  • Machine-readable passport
• Public-key cryptography