A post-quantum cryptography (PQC) readiness assessment should show where your organization uses cryptography, what systems and data rely on it, which dependencies are most urgent to change, and whether you can make those changes safely. Its output should be a validated inventory and a risk-ranked migration roadmap—not simply a list of algorithms or a score with no evidence behind it.
What should the assessment establish?
It should connect cryptographic use to the services, systems, suppliers, and information it protects. That gives decision-makers a basis for setting priorities, sequencing migrations, and assigning owners. NIST’s Migration to PQC FAQ, last updated June 30, 2026, describes inventory and migration as central parts of the transition; the joint CISA, NSA, and NIST quantum-readiness factsheet likewise emphasizes inventory, data criticality, and risk-based prioritization.
There is no universal private-sector readiness score or pass threshold in those sources. Treat any score as an organization-specific summary, and require it to be backed by coverage, evidence, and explicit risk decisions.
Who and what belong in scope?
Set the assessment boundary before interpreting its findings. Include the people accountable for the work and the technology and services that could contain or depend on cryptography.
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- Accountability: name an executive sponsor, an inventory or migration lead, system and data owners, cybersecurity and privacy risk staff, procurement, legal or compliance, and relevant suppliers.
- Technology boundary: consider on-premises systems, cloud, SaaS, endpoints, operational technology, embedded devices, third-party services, and acquired or externally managed systems. Record exclusions and why they were made.
- Business context: identify the business services and data owners connected to each system, so a cryptographic finding can be assessed by its operational and information impact.
- Policy applicability: distinguish internal policy from obligations that actually apply. U.S. federal policy and requirements for National Security Systems have their own applicability and implementation rules; they should not be assumed to apply to every organization.
NIST’s federal migration FAQ offers a governance model for its federal context, but an organization outside that context should verify its own legal, contractual, and sector requirements.
What belongs in a cryptographic inventory?
NIST describes a cryptographic inventory as a record of cryptography across systems, applications, services, devices, and data flows. It can cover algorithms, protocols and services, keys and lifecycle metadata, certificates, dependent components, and the information being protected. The inventory should record metadata about keys—not the key material itself.
For each discovered use, capture enough detail to validate what it does and determine how it could be migrated:
- Asset and ownership: system, service, application, environment, accountable owner, and dependent business service.
- Cryptographic function: algorithm, key type, purpose, protocol, cryptographic library or provider, and implementation or version where known. Note whether it provides encryption, key establishment, signatures, authentication, or another function.
- Trust and lifecycle: certificates and certificate chains, trust relationships, key owner, and relevant lifecycle dates or status. Do not place secrets or private key material in the inventory.
- Protected information and impact: data type, sensitivity, expected confidentiality lifetime, integrity or authentication needs, and system criticality.
- Dependency and evidence: vendor or service dependency, support lifecycle, replacement constraints, discovery evidence, and confidence in the finding.
- Migration state: discovery and validation status, risk decision, approved plan or exception, testing, deployment, and retirement status.
Look beyond systems that visibly encrypt files. NIST’s FAQ identifies protocols and services such as TLS, SSH, VPN, code signing, and email encryption as possible inventory entries. Certificates, chains, and dependent components matter too: an algorithm may be only one link in a larger trust or application workflow.
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Inventory discovery is not the same as validation. Record how a use was found and whether an owner or technical check confirmed it. An unverified entry, an unexamined environment, and a confirmed absence of cryptography are different findings.
How should the assessment decide what is urgent?
Prioritize by the consequences of leaving a dependency unchanged and the difficulty of replacing it—not by raw counts of cryptographic uses. The CISA, NSA, and NIST factsheet supports relating vulnerable technology to the criticality of its data and using risk to guide migration priorities. The following are practical assessment dimensions, not an official government scoring formula:
- Confidentiality lifetime and sensitivity: how long the information must remain confidential and the harm if it is exposed.
- System and mission impact: the consequences of disruption or compromise, including effects on essential business services.
- Dependency reach: how many systems, users, partners, or workflows rely on the cryptographic function.
- Replacement difficulty and lead time: whether the implementation is embedded, supplier-controlled, difficult to update, or tied to a long procurement cycle.
- Operational impact: the risk that change could affect availability, compatibility, safety, recovery, or service continuity.
Include “harvest now, decrypt later” in the analysis where captured information could become readable in the future but must remain sensitive for years. NIST’s PQC explainer discusses this exposure and the need to identify applications using encryption. This is a reason to plan for long-lived data; it is not evidence that a cryptographically relevant quantum computer exists today.
Make the prioritization explainable: show the evidence behind each high-priority item, the consequence of delay, and who accepts any residual risk. If a ranking uses numerical weights, document how they were chosen rather than presenting them as a NIST-approved formula.
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Which standards and implementation questions should be checked?
As of October 7, 2026, NIST’s first three finalized PQC standards are FIPS 203, FIPS 204, and FIPS 205. NIST says they can and should be put into use now. Their publication does not mean every product, protocol, certificate workflow, or legacy system already supports them.
| Standard | Algorithm | Purpose |
|---|---|---|
| FIPS 203 | ML-KEM | Key establishment |
| FIPS 204 | ML-DSA | Digital signatures |
| FIPS 205 | SLH-DSA | Digital signatures |
For each relevant product or service, ask the supplier which algorithm and protocol profile it supports, in which release, with which peers or hardware, and under what validation status. Then assess the actual system’s requirements rather than treating a roadmap entry as proof of readiness.
- Check whether certificate and key formats, chains, and trust workflows work across the systems that need to interoperate.
- Test handshake or message behavior, performance, and constraints on embedded or resource-limited devices where relevant.
- Check fallback and downgrade handling, logging, backup, and recovery so the change does not create avoidable security or operational failures.
- Identify validation obligations, sector requirements, supplier dependencies, and the evidence needed to approve deployment.
NIST has also selected HQC for standardization as an additional key-establishment option and describes work on another digital-signature standard. These in-progress standards should not be represented as finalized replacements for the three published FIPS standards.
Can the organization change cryptography safely?
Readiness depends on more than choosing a target algorithm. NIST’s final CSWP 39, announced December 19, 2025, defines crypto agility as the capability to replace and adapt algorithms across protocols, applications, software, hardware, firmware, and infrastructure while preserving security and ongoing operations.
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Assess whether the organization can identify the affected dependencies, make a controlled change, confirm compatibility, and recover if the change causes problems. Useful evidence includes:
- Documented ownership of cryptographic configuration and change decisions.
- Known dependencies between libraries, applications, protocols, hardware, and suppliers.
- Configuration or policy mechanisms that can be changed without an avoidable redesign of the whole service.
- Test environments and procedures that cover relevant versions, peers, and operating conditions.
- Deployment monitoring, rollback or recovery procedures, and a way to handle exceptions.
Crypto agility involves trade-offs; an assessment should identify constraints and remediation options rather than assume one architecture or implementation recipe fits every system.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should the assessment deliver?
A useful deliverable turns evidence into an owned migration program. It should make clear what is known, what remains unverified, what takes priority, and what decisions or resources are needed.
- A scoped, validated inventory with evidence and confidence levels.
- A dependency map connecting cryptographic uses to systems, services, data, owners, and suppliers.
- A risk-ranked backlog, with rationale, target standards, and any approved exceptions.
- Migration waves that identify owners, prerequisites, supplier actions, and interoperability or performance testing.
- Procurement, budget, staffing, and policy needs, including replacement or support constraints.
- Milestones and a recurring review process for new systems, supplier changes, and completed migrations.
Choose progress measures that reflect meaningful coverage and change—for example, the share of in-scope assets with a validated cryptographic record, or the share of high-priority dependencies with an approved migration plan. These are suggested organization-specific measures, not published NIST benchmarks. Report the denominator and scope so a percentage cannot conceal an unassessed part of the environment.
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How should an organization evaluate discovery tools or assessment approaches?
Compare approaches against the environment and the decisions the assessment must support. NIST identifies discovery and inventory, as well as interoperability and benchmarking, as PQC project workstreams; the following criteria are practical evaluation questions, not an official NIST ranking.
- Coverage: can it help identify cryptography in code, runtime environments, cloud, networks, operational technology, and third parties relevant to your scope?
- Evidence quality: can findings be traced to their source and validated, with uncertainty made visible?
- Context: can findings be connected to dependencies, business services, data criticality, and accountable owners?
- Export and integration: can inventory data be used with existing asset, risk, and configuration-management systems?
- Migration support: does the approach support the interoperability and performance testing the affected systems require?
- Information handling: how is sensitive inventory information protected and access controlled?
- Operational fit: what expertise, supplier support, and ongoing effort are needed to maintain the inventory?
NIST’s FAQ points to a workbook as a possible starting point for a centralized inventory. A tool can assist discovery and tracking, but the assessment still needs owners to validate findings, judge risk, and plan changes.
How should the 2035 date be interpreted?
NIST’s PQC project page describes a plan to deprecate and ultimately remove quantum-vulnerable algorithms from NIST standards by 2035, with high-risk systems transitioning earlier. That is a NIST standards transition plan, not a universal deadline requiring every private organization to finish migration by 2035. Organizations should check which standards, contracts, sector rules, or government requirements apply to them and follow the relevant implementation guidance.
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