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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →CIOs should begin post-quantum cryptography (PQC) planning now—not because a quantum computer capable of breaking today’s public-key cryptography is known to be imminent, but because arrival estimates are uncertain, sensitive information can remain valuable for years, and enterprise-wide cryptographic change takes time. NIST has finalized three PQC standards and says they are ready to implement. The immediate work is to find where public-key cryptography is used, prioritize the highest-risk systems, engage suppliers, and plan a controlled migration.
Why does PQC planning matter before a quantum computer arrives?
Post-quantum cryptography is designed to protect against quantum-enabled attacks on cryptographic systems, particularly public-key cryptography. For an enterprise, adopting PQC is not simply a matter of selecting a new algorithm. Public-key cryptography is embedded in protocols, applications, infrastructure, hardware, firmware, and products supplied by third parties. Changing it can affect systems and organizations that depend on one another.
Quantum arrival dates are uncertain
NIST’s FAQ, updated June 30, 2026, describes estimates for a cryptanalytically relevant quantum computer ranging from some forecasts by 2030, to many estimates of 15–20 years, to views that it could take more than 30 years. These are widely varying estimates, not a consensus forecast or a firm deadline. No specific arrival date should be treated as assured.
Long-lived confidential data faces a different time horizon
In a “harvest now, decrypt later” scenario, an attacker collects encrypted information today and attempts to decrypt it in the future if sufficiently capable quantum computing becomes available. That possibility makes the confidentiality lifetime of information a practical factor in migration priorities. It does not mean that all encrypted data can be decrypted now, or that a quantum computer has already demonstrated this capability.
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The concern is greatest when information must remain confidential for a long time and could be exposed to collection. A system’s criticality, lifespan, external dependencies, and difficulty of upgrading also matter. These factors help determine where planning and testing should begin.
Which PQC standards are ready to implement?
NIST’s current post-quantum cryptography program page identifies three finalized standards as ready for implementation. They cover two different functions:
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| Standard | FIPS number | Function |
|---|---|---|
| ML-KEM | FIPS 203 | Key establishment |
| ML-DSA | FIPS 204 | Digital signatures |
| SLH-DSA | FIPS 205 | Digital signatures |
These standards are not interchangeable: a key-establishment function and a digital-signature function serve different purposes. CIOs should map each use to the systems, protocols, and counterparties that consume it before evaluating a specific implementation.
Distinguish finalized standards from candidates
An algorithm under consideration is not the same as a finalized NIST standard. NIST’s current program page reports that HAWK, which had been under consideration, was withdrawn in July 2026 after a reported vulnerability; NIST says the withdrawal does not affect the three finalized standards. This is one reason to check official status rather than treating every PQC proposal or supplier announcement as an adopted standard.
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What should a CIO inventory first?
Start by finding where public-key cryptography is used and what each use protects or enables. NIST’s Post-Quantum Cryptography FAQ and NCCoE migration work emphasize cryptographic visibility, risk management, interoperability, and benchmarking. The inventory should be useful for decisions, not just a list of algorithms.
- Cryptographic use: record the algorithms and protocols in use, and whether each instance supports key establishment, digital signatures, or another public-key function.
- Ownership and dependencies: identify the system and data owners, internal applications and infrastructure that rely on the cryptography, external counterparties, and supplier products involved.
- Data and system exposure: note the sensitivity and confidentiality lifetime of the information, exposure to collection, system criticality, and expected system lifespan.
- Change constraints: document upgrade paths, hardware or software dependencies, certificate and protocol relationships, supplier schedules, and other factors that could delay replacement.
Include security architecture, infrastructure, application teams, procurement, relevant legal or privacy stakeholders, and business owners of sensitive long-lived data. An inventory that misses an application owner or an external dependency may not reveal the full migration path.
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How should the enterprise organize a migration?
Joint CISA, NSA, and NIST guidance recommends a quantum-readiness roadmap and vendor engagement. NIST’s migration work likewise treats readiness as phased work involving visibility, risk management, interoperability, and benchmarking. A CIO can turn those principles into a governed program:
- Assign ownership. Name an executive sponsor, a technical program owner, and a cross-functional working group. Set a decision process and roadmap so PQC is managed as an enterprise change program rather than a one-off product purchase.
- Build the inventory. Gather cryptographic-use, ownership, dependency, supplier, and upgrade information across applications, protocols, infrastructure, hardware, firmware, and services.
- Rank migration priorities. Combine confidentiality lifetime and sensitivity with exposure to collection, criticality, system lifespan, external dependencies, and upgrade difficulty. Put high-risk systems earlier in the plan.
- Ask suppliers for specific evidence. Request supported standards and protocol versions, rollout timing, upgrade mechanisms, interoperability evidence, performance results, and an explanation of how algorithm changes will be handled.
- Test representative systems. Assess compatibility and operational effects in the organization’s own environment before broad deployment. Include the full protocol path, certificates, endpoints, and counterparties, not only an isolated algorithm.
- Fund phased work. Turn the inventory and priorities into budgeted projects with supplier milestones, test plans, rollback procedures, and measures of progress. Revisit dependencies and official guidance as the program advances.
What does NIST’s 2035 transition horizon mean?
NIST’s current program page sets 2035 as the horizon for deprecating and ultimately removing quantum-vulnerable algorithms from NIST standards, with high-risk systems transitioning earlier. This is a standards-transition horizon, not a safe date to begin discovery and not evidence that every private organization has the same binding deadline.
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NIST IR 8547, “Transition to Post-Quantum Cryptography Standards,” was published on November 12, 2024, as an Initial Public Draft; its comment period closed on January 10, 2025. It describes NIST’s expected approach but is a draft, not final guidance. For detailed algorithm-specific transition dates or procurement requirements, consult the latest NIST publication rather than inferring a mandate from the draft or the 2035 horizon. NIST’s account of the 2022 White House memorandum provides historical context for the U.S. goal to mitigate as much quantum risk as feasible by 2035; present-day planning should follow current NIST transition guidance.
How should CIOs evaluate PQC implementations?
There is no universal implementation winner established for every enterprise use case. Evaluate a candidate against the system and operational requirements it must meet, and ask suppliers to substantiate their claims.
- Standards status and function: confirm whether the implementation uses a finalized NIST standard or a candidate, and whether it provides the required key-establishment or signature function.
- Interoperability: verify that protocols, certificates, endpoints, and counterparties work together in the intended configuration.
- Performance and resource demands: benchmark throughput, latency, memory, network overhead, hardware support, and operational impact in the actual deployment. Results should not be generalized from a different environment.
- Supplier readiness: establish supported versions, delivery dates, dependencies, and upgrade mechanisms with each relevant supplier.
- Security basis and maturity: understand the implementation’s security basis and operational maturity, and distinguish official standard status from a vendor-specific proposal.
- Crypto agility: assess whether the organization can replace or adapt algorithms across protocols, applications, software, hardware, firmware, and infrastructure without unacceptable disruption.
- Operational controls: confirm that monitoring, change governance, and rollback are practical for the systems involved.
NIST’s 2025 final publication, CSWP 39, describes cryptographic agility as the capability to replace and adapt cryptographic algorithms while preserving security and operations. For CIOs, that means favoring governed configuration and upgrade paths over architecture that assumes one algorithm will never need to change.
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