Connecting the world and beyond

Programme

Fourth ITU-T X.509 Day

Fully Virtual, 5 September 2025

13:00 - 13:10	Opening remarks Seizo Onoe, Director, Telecommunication Standardization Bureau, International Telecommunication Union (ITU) Arnaud Taddei, Chair, ITU-T Study Group 17 \| Broadcom
13:10 - 13:30	Keynote - X.509 in 2025: Navigating the post-quantum era This keynote will provide a high-level overview of how the X.509 standard is evolving to meet current challenges (PQC readiness, decentralized trust, etc.) and the vision for its future. Stiepan Kovac, CEO, QRC Eurosmart, Luxembourg
13:30 - 14:00	Thematic presentations Erik Andersen, Editor of ITU-T X.509 \| ISO/IEC 9594-8: "Decentralized PKI and cross-border identity: Innovations in DPKI and implementing X.509 in global digital identity frameworks" "Trust in AI-enabled systems: How certificate-based trust and identity management can underpin security for and from AI and ML systems"
14:00 - 14:40	Examples of ITU-T X.509 adoption / implementation Klinger Assaf: "Work of ITU-T Study Group 11 on combating fraudulent communications (scam calls, robocalls, etc.)" Jad el Cham, Senior Technical Training and Development Officer, RIPE Network Coordination Center: "Resource public key infrastructure (RPKI)" Steffen Fries, Principal Engineer Security, Siemens AG, Germany: "PQC transition considerations for power system automation in IEC 62351" Hoyt L Kesterson II, Senior Security & Risk Architect, CNC Consulting: "X.509 for digital signatures"
14:40 - 15:20	Panel discussion - Building resilient trust infrastructures William Kadio Kassy, Deputy Director of Digital Transformation, Autorité de Régulation des Télécommunications/TIC de Côte d'Ivoire (ARTCI) Sofia Celi, Senior Cryptography Researcher, Brave Sungchae Park, Senior Researcher, Soonchunhyang University, Korea (Rep. of) \| Rapporteur, Question 1/17 Brandy Smith
15:20 - 15:35	Interactive Q&A and open floor discussion
15:35 - 15:40	Summary and closing Arnaud Taddei, Chair, ITU-T Study Group 17 \| Broadcom