Explainer
Quantum-safe security starts with ordinary computers
Protecting data against future quantum computers depends on replacing the public-key mathematics in today's systems, not on quantum hardware. NIST approved its first three post-quantum standards in August 2024, and the migration has begun.
The change already has a starting point
On 13 August 2024, NIST announced approval of three post-quantum cryptography standards. One provides a way for communicating parties to establish a shared secret; two concern digital signatures, which help verify who signed data and whether it has changed.
What does “post-quantum” mean?
These methods run on conventional computers. Their mathematics is designed to withstand attacks from both conventional and future quantum computers. That is different from sending quantum states through a special communication link.
Why prepare ahead of time?
A sufficiently capable quantum computer could undermine widely used public-key cryptography. Information intercepted today may still be sensitive when a future attacker can decrypt it, and replacing cryptography across existing systems takes time.
What the milestone does—and does not—show
A published standard gives implementers a common specification. It does not mean every service has adopted it, or that an encryption-breaking quantum computer has been built. When reading a rollout announcement, look for which systems changed and what independent testing was performed.