ITU's 160 anniversary

Committed to connecting the world

Fourth ITU-T X.509 Day

​​​ Fourth ITU-T X.509 Day

15:00 - 18:00 CEST  

T​he International Telecommunication Union (ITU) is organizing the Fourth ITU-T X.509 Day that will take place virtually on 5 September 2025 from 15h00 to 18h00 CEST.

ITU-T X.509 is the universal language for public key infrastructure (PKI) and privilege management infrastructure (PMI) – the fundamental building blocks for secure transactions in business-to-business (B2B), business-to-customer (B2C) and government-to-citizen (G2C) environments. 

As a widely recognized standard, ITU-T X.509 provides a reliable and secure foundation for a wide range of industries, from agriculture and education to energy, finance, entertainment, health, manufacturing, transport, and utilities. The basic data structures defined in ITU-T X.509 support seamless interoperability and application-specific extensions, making it indispensable to businesses, consumers, governments and all organizations worldwide.

For over 35 years, ITU-T X.509 has been empowering businesses and organizations globally to secure their transactions and communications and ITU continues to honour the legacy of ITU-T X.509 by celebrating its achievements annually.


Target audience
Participation is free of charge and open to all interested stakeholders including ITU Member States, Sector Members, Associates and Academic Institutions and to any individual from a country that is a member of ITU and who wishes to contribute to the work. The event will be fully virtual and held in English only. Registration to the event is mandatory.
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Register here


Remote Participation: Connect to the ITU MyMeetings platform using the same ITU user account with which you registered for the meeting. You can launch the remote session by clicking the JOIN button from 30 minutes prior to the start of the meeting.

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