Organizations should begin preparing for post-quantum cryptography now—not because a quantum computer is known to be close, but because migration takes planning and attackers may already be collecting encrypted data to decrypt later. Start by finding where public-key cryptography is used, identifying information that must remain secret for years or decades, and building a risk-based migration plan.
What quantum computing puts at risk—and what it does not
The security concern centers on today’s public-key cryptography, including RSA and elliptic-curve systems. These systems support tasks such as establishing encryption keys, authenticating users or services, and creating digital signatures. A sufficiently capable quantum computer could undermine some of those public-key methods.
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That does not mean every form of encryption or every cryptographic technique is equally affected, or that a quantum computer is about to break all internet security. The practical response is to identify vulnerable public-key uses and plan a controlled transition, rather than assume that a single product or setting makes an entire organization “quantum-safe.”
Post-quantum cryptography (PQC) means cryptographic methods designed to resist attacks by both classical and quantum computers. The methods are adopted through software, services, protocols, products, and infrastructure. Quantum readiness is therefore a migration and risk-management effort, not a one-time purchase.
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Why the “harvest now, decrypt later” risk makes timing matter
“Harvest now, decrypt later” describes an adversary collecting encrypted information today and retaining it in the hope of decrypting it when a capable quantum computer becomes available. The information may be protected against present-day attacks and still face a future confidentiality risk.
This matters most when information must remain private or valuable for a long time. NIST identifies health records, financial information, intellectual property, and national-security data as examples of potentially long-lived sensitive information. If its required secrecy lifetime is longer than the time available to complete a secure migration, waiting for a quantum computer to appear could be too late.
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There is no reliable arrival date for a cryptographically relevant quantum computer. NIST says predictions vary widely and that no one knows when such a machine will be built. Its explainer also gives historical context: integrating an algorithm into information systems after standardization has taken 10 to 20 years. That is a historical observation, not a forecast that every PQC migration will take that long.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteWhich post-quantum standards are finalized?
NIST says its first three PQC standards are finalized and ready for implementation. The names and primary purposes are:
| Standard | Primary purpose |
|---|---|
| ML-KEM (FIPS 203) | Establishing shared cryptographic keys |
| ML-DSA (FIPS 204) | Digital signatures |
| SLH-DSA (FIPS 205) | Digital signatures using a hash-based approach |
These finalized standards are distinct from algorithms still being evaluated. NIST’s project page reported on July 28, 2026, that it had withdrawn HAWK after a vulnerability was reported in the candidate under consideration; NIST said the finding did not affect finalized standards such as ML-KEM and ML-DSA. NISTIR 8610, published May 14, 2026, describes additional signature candidates under evaluation. A candidate is not a finalized standard simply because it is being assessed.
NIST IR 8547, published as an initial public draft on November 12, 2024, describes an expected transition approach; its public-comment period closed January 10, 2025. It is a draft, not a final mandatory migration deadline. For current status, distinguish standards ready for implementation from draft guidance and candidates still under evaluation.
What organizations should do now
A useful first move is to establish a cross-functional project team and give it authority to coordinate security, IT, procurement, risk, privacy, and operational technology where relevant. The joint CISA, NSA, and NIST factsheet recommends a project-management team and a quantum-readiness roadmap.
- Inventory cryptographic use. Record where public-key algorithms and protocols are used across applications, services, systems, certificates, keys, communications, and software or firmware signing. Include supplier dependencies: cryptography may be embedded in products or services the organization does not operate directly. Andrew Regenscheid, a NIST mathematician and cryptographic expert, describes understanding reliance on cryptography and building an inventory of systems, applications, and data as the first step.
- Identify long-lived sensitive information. Map what the organization must keep confidential, for how long, and which systems, communications, applications, and vendors handle or protect it. A list of cryptographic assets without the data’s confidentiality lifetime cannot show which exposures deserve priority.
- Prioritize by consequence and exposure. Rank systems using the sensitivity and required secrecy lifetime of their data, their dependence on vulnerable public-key cryptography, and the consequences of compromise or service disruption. This creates a defensible order of work instead of treating every asset as equally urgent.
- Build and maintain a migration roadmap. Set owners, sequencing, testing plans, operational dependencies, and interoperability requirements. Plan for how systems will accommodate algorithm changes without breaking services. NIST’s final CSWP 39, published December 19, 2025, frames this capability as crypto agility: adapting or replacing algorithms across protocols, applications, software, hardware, firmware, and infrastructure while preserving security and operations.
- Ask vendors for specific readiness evidence. Ask when and how each relevant product or service will support finalized NIST standards, what upgrades or dependencies are required, and how interoperability will be maintained. Include PQC readiness in procurement and modernization decisions where appropriate; distinguish a documented implementation plan from a general claim of being “quantum-safe.”
- Track standards and guidance by status. Use finalized standards for implementation planning, and label draft transition guidance and candidate algorithms accurately. Revisit the inventory and roadmap as products, standards, and migration guidance change.
When assessing a vendor proposal or migration plan, check its actual coverage of protocols, algorithms, applications, endpoints, certificates, and dependencies; whether it prioritizes data by secrecy lifetime; how it handles compatibility, rollout, and service continuity; and how readily algorithms can be changed again. Also verify the stated standards status and the supplier’s upgrade path. These questions help expose the difference between a concrete migration plan and an unsupported assurance.
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What individuals can do
- Keep operating systems, browsers, applications, and connected devices updated; enable automatic updates where appropriate.
- Ask banks, cloud providers, messaging services, and other relevant providers whether and when they plan to support finalized NIST PQC standards.
- Do not attempt to replace cryptographic settings yourself or assume that buying a generic router, computer, VPN, or accessory provides quantum resistance.
NIST expects software applications, browsers, and other tools to adopt PQC over time. Individual update habits and questions to providers are useful, but they do not replace an organization’s coordinated inventory, risk assessment, and system migration.
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