What is post-quantum cryptography and should organizations already be planning for it?
Post-quantum cryptography refers to cryptographic algorithms designed to remain secure against attacks from both today’s conventional computers and future quantum computers. This matters because sufficiently powerful quantum computers could eventually break some of the cryptographic methods currently used to protect sensitive data and communications.
Organizations should therefore already be planning for the transition, but without panic.
The European Union has developed a coordinated roadmap for the transition to post-quantum cryptography. It calls on Member States to begin that transition by the end of 2026 and identifies 2030 as an important target for protecting high-risk systems, including critical infrastructure.
The reason for starting now is not that a cryptographically relevant quantum computer will necessarily arrive tomorrow. There is a more immediate concern known as “store now, decrypt later.”
An attacker can intercept and store encrypted information today in the hope of decrypting it once the necessary quantum capability becomes available. Information that must remain confidential for many years can therefore already be at risk. The European Commission has identified this as an important reason to start the transition early.
It will not be enough to protect only external connections. Post-quantum protection will eventually need to include internal communication as well.