A useful post-quantum cryptography (PQC) readiness assessment does more than count encryption algorithms. It identifies where cryptography is used, what systems and data depend on it, which exposures matter most, and how safely the organization can change algorithms and protocols. Its final output should be a risk-ranked, owned migration roadmap—not an unsupported pass/fail score.
What should the assessment establish?
It should give decision-makers a defensible picture of the organization’s cryptographic exposure and its ability to respond. That means connecting cryptographic uses to systems, business services, data, suppliers, and accountable owners. An algorithm list without those relationships cannot show which migration deserves attention first.
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NIST’s Migration to PQC FAQ, last updated June 30, 2026, describes an inventory as a record of cryptography across systems, applications, services, devices, and data flows. The joint CISA, NSA, and NIST quantum-readiness factsheet likewise ties inventory to risk assessment and migration prioritization. These are foundations for an assessment, not a universal official checklist or scoring formula.
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It is a structured record of where cryptographic mechanisms are used and what relies on them. Start by setting scope, then collect evidence from multiple sources: architecture and configuration records, code and software dependencies, runtime or network observations, cloud and supplier documentation, and conversations with system owners. Validate discoveries with the people responsible for the systems; an automated finding alone may not establish how a cryptographic component is used in production.
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Set a boundary that reflects the real environment
Consider on-premises infrastructure, cloud platforms, SaaS, operational technology, endpoints, embedded devices, externally managed systems, and acquired environments. Record what is included, what is excluded, why, and who is responsible for resolving unknowns. Business-service and data owners should be in scope alongside technical teams so findings can be ranked by consequence rather than treated as an undifferentiated count.
Capture enough detail to act
For each cryptographic use, record the asset or service, owner, environment, business-service dependency, algorithm, key type, purpose, protocol, cryptographic library or provider, and implementation version where known. Include certificates and chains, trust relationships, key ownership and lifecycle dates or status—but never collect or store key material in the inventory.
Describe the protected data, its sensitivity and expected confidentiality lifetime, and whether the cryptography supports confidentiality, integrity, authentication, or another purpose. Track vendor dependencies, support lifecycle, replacement constraints, discovery evidence and confidence, and migration status. NIST identifies protocols and services such as TLS, SSH, VPN, code signing, and email encryption as relevant inventory areas; the full operational record should be tailored to the organization rather than mistaken for a mandated schema.
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How should you decide what to prioritize?
Prioritize by the harm of delayed migration and the difficulty of making a change—not simply by the number of vulnerable algorithms found. The government factsheet supports using inventory and data criticality for risk-based prioritization. The following dimensions are a practical assessment synthesis, not a government-prescribed scoring formula:
- Confidentiality lifetime and sensitivity: Could information captured now remain sensitive for years? Consider “harvest now, decrypt later” exposure where an adversary stores encrypted data today in hope of decrypting it in the future. NIST discusses this risk; it is not evidence that a cryptographically relevant quantum computer exists today.
- Mission or business impact: What would loss of confidentiality, integrity, or authentication mean for the service, customers, safety, or operations?
- Dependency reach: Is the cryptographic use embedded in a widely used platform, shared service, certificate chain, supplier product, or many downstream systems?
- Change difficulty and lead time: Is the system difficult to upgrade, constrained by hardware, dependent on a vendor release, or subject to long procurement and validation cycles?
- Operational impact: Could a change disrupt availability, interoperability, recovery, or business-critical workflows?
Document the rationale and evidence behind each priority. If a dependency, owner, or data lifetime is unknown, make that uncertainty visible and assign a discovery action instead of treating the asset as low risk by default.
Which standards and implementation details should the assessment check?
As of October 7, 2026, NIST’s first three finalized PQC standards are FIPS 203, FIPS 204, and FIPS 205. NIST says the standards can and should be put into use now. Their publication does not establish that every product, protocol, certificate workflow, or legacy system is compatible.
| Standard | Algorithm | Purpose |
|---|---|---|
| FIPS 203 | ML-KEM | Key establishment |
| FIPS 204 | ML-DSA | Digital signatures |
| FIPS 205 | SLH-DSA | Digital signatures |
Ask each supplier which algorithm and protocol profiles its product supports, in which release, with what validation status, and with which peers or hardware. Distinguish a roadmap announcement from a delivered, supportable implementation. Check applicable sector rules and validation requirements rather than assuming a standard’s publication settles them.
Test the actual deployment, not just the product claim
Build tests around the systems and protocols in scope. Where relevant, examine certificate and key sizes, handshake or message behavior, performance, constrained-device limits, fallback and downgrade handling, logging, backup and recovery, and interoperability across supported versions and counterparties. Record test conditions, results, defects, mitigations, and the owner authorized to accept any residual risk.
NIST has also selected HQC for standardization as an additional key-establishment option and describes work on another digital-signature standard. These are not finalized replacements for the three published FIPS standards; keep them separate in planning and do not label them as approved deployed standards.
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Can the organization change cryptography safely?
Assess crypto agility: the ability to replace and adapt cryptographic algorithms across protocols, applications, software, hardware, firmware, and infrastructure while preserving security and ongoing operations. NIST’s final CSWP 39, announced December 19, 2025, explains the concept and its approaches, challenges, and trade-offs; it does not prescribe one universal implementation recipe.
Look for cryptographic choices that can be changed through controlled configuration or policy where appropriate, rather than being scattered through business logic. Map dependencies that would require redesign, confirm that teams can test changes in representative environments, and check that deployment procedures include monitoring, rollback, and operational ownership. An algorithm appearing on a product roadmap is not evidence that the organization can migrate it safely.
What should the assessment deliver?
The deliverable should turn findings into work that can be funded, assigned, tested, and tracked. At minimum, expect:
- A scoped, validated inventory with evidence and confidence levels, plus explicit gaps and exclusions.
- A dependency map connecting cryptographic uses to systems, services, owners, suppliers, and protected data.
- A risk-ranked backlog with documented rationale, decisions, and approved exceptions.
- Migration waves with target standards, dependencies, accountable owners, supplier actions, and required interoperability or performance testing.
- Procurement, budget, staffing, and validation needs, including replacement or support constraints.
- Milestones and a recurring review process for changes in systems, suppliers, standards, and migration status.
Choose measures that show evidence and progress rather than implying an externally certified readiness score. Examples include the share of in-scope assets with validated cryptographic records and the share of high-priority dependencies with approved migration plans. These are organization-specific measures, not published NIST benchmark thresholds.
How do you evaluate discovery tools or assessment approaches?
Compare approaches on whether they reveal useful, verifiable coverage and make the resulting information usable. Consider:
- Coverage across source code, runtime environments, cloud, networks, operational technology, and third parties.
- How findings are evidenced and validated, including the rate of unresolved or false-positive discoveries.
- Whether the approach maps dependencies and business context instead of producing isolated algorithm detections.
- Inventory export and integration with asset, risk, and configuration-management systems.
- Support for interoperability and performance testing, as distinct from discovery alone.
- How sensitive inventory information is protected and who can access it.
- Operating cost, required expertise, supplier support, and the effort needed to keep findings current.
NIST identifies discovery and inventory, as well as interoperability and benchmarking, as PQC project workstreams. These comparison criteria are practical evaluation questions, not an official ranking of tools. A workbook or discovery product may help organize the work, but the cited guidance does not establish that a particular paid product or appliance is required.
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NIST’s PQC transition plan says it plans to deprecate and ultimately remove quantum-vulnerable algorithms from NIST standards by 2035, with high-risk systems transitioning earlier. That is a standards transition plan, not a universal deadline for every private organization. The June 2026 White House executive order is U.S. federal policy context; federal agencies and National Security Systems have distinct applicability requirements. Other organizations should check their own regulatory, contractual, and sector obligations rather than adopting a federal milestone as if it automatically applied to them.
No universal private-sector readiness score or numerical threshold for passing an assessment is established in the cited guidance. A credible assessment states its scope, evidence, risk criteria, unresolved gaps, and organization-specific progress measures clearly.
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