International Civil Aviation Organization Public Key Directory

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.

A September 2011 United States Central Intelligence Agency document released by in December 2014 explains the purpose and scope of the system:

The United Nations became the first non-state member in October 2012, enabling issuing of e-UNLP, the electronic form of the United Nations laissez-passer.

In December 2014, ICAO self-reported the PKD as having 45 participating member countries.

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

In January 2017, ICAO self-reported the PKD as having 55 participating member countries.