Slides of keynote given at Cybersec Europe 2025.

Public key cryptography is essential in our society. We use it constantly, for instance to secure digital communication. Powerful quantum computers could break this in the long term and are already a risk today. Someone who intercepts secure communication today may indeed be able to decipher it in the future with a powerful quantum computer.

We need to replace our cryptography. History has taught us that such a migration path is cumbersome and can take many years. Multiple new migrations may be ahead of us, not only due to the threat of cryptographically relevant quantum computers.

Cryptographic agility promises to drastically smoothen such migrations. But what does it mean in practice? This talks dives into the topic, inspired by concrete cases from the public sector.