Post-quantum cryptography
Encryption and signature schemes designed to remain secure against an adversary holding a large quantum computer.
Post-quantum cryptography is the family of algorithms believed to resist attack by a quantum computer, most of them based on lattice, hash, code or isogeny problems rather than on the factoring and discrete-logarithm problems that today's public-key cryptography relies on. National standards bodies have published selected schemes for key establishment and for digital signatures, along with migration guidance.
It runs on ordinary hardware. Nothing about deploying it requires quantum technology - it is a software and protocol migration, and the engineering questions are key and signature sizes, handshake cost, and how long a transition period runs with both classical and post-quantum schemes in place. Hybrid modes, which combine a classical and a post-quantum exchange so the result is at least as strong as either, are the usual first step.
The reason to do it before a capable machine exists is that recorded traffic cannot be protected retroactively - and the reason to design for it to be changed again is crypto-agility, since the current selections are the best available today rather than a permanent answer.
Evidence that keeps pace with the decision.
Evaluate Nuclir against the systems, markets, and decisions that matter to your organization. The result is current intelligence with the context needed to use it responsibly.