Build a living cryptographic inventory from code, configuration, network endpoints, certificates, asset records, and supplier information. Record each algorithm’s purpose, owner, dependencies, protected data, and lifecycle status; then rank entries by quantum exposure, confidentiality lifetime, business impact, signing role, and upgrade difficulty. No single scanner can reveal every use, so reliable planning depends on reconciling several discovery methods and keeping the results current.
What a post-quantum cryptography inventory is
A cryptographic inventory is a descriptive record of where and how an organization uses cryptography. NIST’s National Cybersecurity Center of Excellence describes it as covering systems, applications, services, devices, and data flows. A useful inventory connects a mechanism to the business activity it protects rather than listing algorithms in isolation.
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The immediate objective is visibility. You cannot sensibly prioritize a migration until you know which systems use quantum-vulnerable public-key cryptography, what data or trust relationships depend on it, who owns each implementation, and how difficult it will be to replace. The inventory is therefore an input to risk assessment and migration planning, not proof that a system is currently exploitable.
Post-quantum work is not a blanket replacement of every cryptographic algorithm. Your records must distinguish public-key encryption, key establishment, and digital signatures from symmetric encryption, hashing, and other uses. They must also capture the purpose and context of each use: a TLS certificate, an SSH host key, a software-signing key, a device-management channel, or an embedded library may require different treatment.
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NIST says its first three post-quantum cryptography standards were finalized in 2024 and advises organizations to begin transitioning. Technology managers can start by inventorying applications that use encryption. The appropriate sequence and any deadline, however, depend on your systems, sector, jurisdiction, suppliers, and applicable standards; the reviewed guidance does not establish one private-sector deadline for everyone.
Set scope and accountability before scanning
Write a scope statement that names the environments and trust relationships you will examine. Include production and development systems where cryptography can reach production, and include technology operated by another party when your organization relies on its keys, certificates, protocols, or signing process.
- IT infrastructure, applications, databases, identity systems, and APIs.
- Operational technology, industrial control systems, laboratory equipment, and safety-related networks.
- Internet-facing and partner-facing services, including cloud and hosted platforms.
- Endpoints, appliances, mobile and embedded devices, firmware, and update mechanisms.
- Certificate authorities, certificate-issuance workflows, hardware security modules, and key-management services.
- Software and firmware signing, boot validation, package repositories, and update distribution.
- Supplier products, managed services, libraries, and components whose cryptography is not directly administered by your team.
Assign a program owner with authority to request evidence and resolve conflicting records. Involve security architecture, infrastructure, application engineering, identity and certificate teams, OT specialists, procurement, legal or third-party risk staff, and system owners. The joint CISA, NSA, and NIST guidance specifically calls for procurement experts to engage supply-chain vendors about technologies that will require migration.
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Use several discovery views instead of one scan
Different methods expose different layers of cryptographic use. An endpoint scan can show what a public service negotiates today but miss dormant code, internal-only services, or an algorithm embedded in a supplier appliance. Code review can reveal a library call that is not exercised in a test environment but may not show a certificate deployed by an operations team. Treat every method as evidence with a defined coverage boundary.
Inspect source code, binaries, and configuration
Search application repositories, infrastructure-as-code, build pipelines, deployment manifests, operating-system configuration, container images, and policy files for algorithm names, protocol settings, cryptographic library calls, certificate paths, key aliases, and signature-verification routines. Look for both direct use and inherited defaults from a framework, operating system, cloud SDK, or appliance.
Record the component and version that supplies the cryptography. A vulnerable algorithm may be selected explicitly, enabled by a library default, or present only in a compatibility mode. Capture whether the code is active, conditionally compiled, disabled by policy, or unknown. Software bills of materials and dependency inventories help locate transitive cryptographic libraries, but they do not by themselves prove runtime use.
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Probe network-facing TLS and SSH services
Enumerate external and internal endpoints, ports, load balancers, service meshes, VPN gateways, management interfaces, and partner connections. Record negotiated protocol versions, key-exchange mechanisms, certificate algorithms, host-key algorithms, and supported fallback modes. Repeat from relevant network positions when policy or segmentation changes what a client can observe.
NIST’s post-quantum FAQ names pqcscan as an example for SSH and TLS server discovery and sslscan2 as an example for TLS cipher-suite discovery. These are starting points, not a complete inventory, and their results should be validated against service configuration and ownership records.
Enumerate certificates and their relationships
Collect certificates from public transparency records, certificate authorities, load balancers, web servers, service meshes, device stores, and application bundles. NIST’s examples include crt.sh for searching certificates associated with domains or organizations. Match each certificate to its private-key owner or custodian, issuing chain, deployment locations, dependent service, expiration date, renewal process, and signature algorithm.
A certificate list is not the same as a cryptographic inventory. It may omit pinned certificates, private trust stores, machine-to-machine identities, short-lived workload certificates, or keys used for signing rather than authentication. Use it as one discovery stream and record the gaps.
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Ask owners and suppliers about invisible use
Send system owners a structured questionnaire that asks which protocols, libraries, certificate stores, key-management services, signing flows, and external dependencies their systems use. Require an evidence attachment or a named person who can confirm the answer. Ask whether cryptography is supplied as a managed cloud function, appliance feature, firmware component, or vendor library.
For suppliers, request supported algorithms and protocol versions, cryptographic implementation locations, certificate and key-rotation mechanisms, signing dependencies, upgrade paths, product support timelines, and any planned post-quantum or hybrid capability. Procurement records should link the response to a contract, product version, and vendor contact so that it can be refreshed when the supplier changes its offering.
What to record for every inventory entry
Use one record per meaningful cryptographic implementation or dependency. If a service uses separate mechanisms for authentication, key establishment, data-at-rest encryption, and software signing, record those uses separately so that their risks and migration actions are visible.
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| Field | What to capture | Why it matters |
|---|---|---|
| System and component | Application, device, service, library, module, environment, and version | Identifies the change target and prevents duplicate records |
| Owner and support contact | Business owner, technical owner, operations team, supplier, and escalation path | Provides accountability for validation and remediation |
| Algorithm and purpose | Algorithm, key type, parameter or security level when known, and purpose such as authentication, key establishment, encryption, hashing, or signing | Separates quantum-vulnerable public-key use from other cryptographic functions |
| Protocol or service | TLS, SSH, IPsec, S/MIME, application protocol, update channel, boot process, or proprietary mechanism | Shows how replacement affects interoperability |
| Key and certificate metadata | Key type, owner or custodian, certificate subject and issuer, expiration, rotation method, lifecycle status, and storage location | Supports renewal, replacement, and dependency analysis without exposing key material |
| Dependencies | Calling applications, dependent services, clients, identity providers, trust stores, libraries, and downstream processes | Reveals migration sequencing and blast radius |
| Protected data or process | Data classification, business function, transaction, device command, software package, or firmware update | Allows confidentiality lifetime and business impact to be assessed |
| Location and exposure | Cloud, data center, branch, OT zone, device fleet, public endpoint, partner connection, or isolated network | Indicates attack exposure and operational constraints |
| Evidence and discovery date | Scanner output, configuration path, source file, certificate record, owner confirmation, vendor statement, and date collected | Makes confidence and staleness visible |
| Lifecycle and migration status | Active, dormant, retired, replacement planned, pilot, blocked, or unknown; target owner and next action | Turns discovery into a managed work queue |
The algorithm, protocol, keys and key metadata, certificates, dependent systems, and protected data correspond to fields highlighted in NIST’s inventory examples. The remaining fields form a practical operating template; NIST does not prescribe one universal schema.
Validate, reconcile, and score confidence
Do not copy scanner output directly into a migration backlog. Reconcile each finding with at least one independent source when practical: configuration with an endpoint result, a certificate record with its deployment owner, or a vendor statement with the product version in use.
- Normalize names. Map hostnames, service names, cloud resources, product identifiers, and certificate subjects to a consistent asset identifier.
- Merge duplicates carefully. Keep separate records when the same system uses different algorithms for different purposes, environments, or trust domains.
- Mark evidence type. Distinguish externally observed behavior, configuration evidence, source-code evidence, inventory metadata, owner confirmation, and supplier confirmation.
- Assign confidence. Note whether the finding is confirmed, probable, stale, contradicted, or unknown, and state what evidence would resolve it.
- Resolve ownership. Route unowned systems to the asset-management or procurement team rather than leaving them as anonymous technical findings.
- Document exceptions. Record inaccessible networks, unsupported devices, proprietary protocols, and systems that cannot be safely probed.
This reconciliation approach is an operational response to the different discovery surfaces; it is not a prescribed NIST test protocol. Confidence is useful because an externally visible endpoint tells you what is observable now, while code, vendor review, or architecture records may reveal dormant, internal, or embedded use.
Prioritize systems for post-quantum migration
Use the inventory to create an ordered risk and dependency backlog. A quantum-vulnerable public-key algorithm deserves attention, but the algorithm alone does not determine priority. Consider the data’s confidentiality lifetime, the system’s criticality and exposure, the role of signatures, supplier constraints, and the feasibility of an upgrade.
| Priority factor | Questions to ask | Typical implication |
|---|---|---|
| Confidentiality lifetime | Could captured traffic or stored ciphertext remain sensitive for years or decades? | Move long-lived sensitive data and “harvest now, decrypt later” exposure higher |
| Quantum-vulnerable public-key use | Does the entry use a public-key algorithm for key establishment, authentication, or signatures that current guidance identifies for post-quantum transition? | Flag for standards mapping and a replacement plan |
| Business criticality and exposure | Would compromise interrupt safety, revenue, identity, regulated operations, or a widely exposed service? | Prioritize systems with severe consequences or broad reach |
| Software and firmware signing | Does the key authorize updates, boot images, packages, or device commands? | Address trust-root design, verification compatibility, and rollback planning early |
| Dependency and supplier risk | Is the mechanism embedded in a product, protocol, certificate chain, or managed service that requires a vendor release? | Start vendor engagement and contract planning before a crisis |
| Migration feasibility | Can the system support a standards-based or hybrid transition, and can clients and peers be upgraded together? | Use easier pilots to build capability while separately tracking hard blockers |
A practical scoring model can assign a small, documented scale to each factor, then require a human review for safety-critical, regulated, or supplier-dependent systems. Keep the evidence and rationale beside the score. Inventory data enables risk assessment and prioritization; it does not establish that every listed system is immediately exploitable or dictate one universal migration order.
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Turn findings into a migration work plan
Start with discovery and architecture decisions
For each prioritized record, identify the cryptographic boundary, the parties that must interoperate, and the data or trust root that must remain valid during transition. Decide whether the target approach is a direct algorithm replacement, a protocol or library upgrade, a hybrid deployment, a certificate and trust-store change, or a hardware or supplier replacement. The appropriate choice depends on standards, product support, performance, message sizes, and operational testing.
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Test compatibility without weakening production security
Build a representative test path that includes clients, servers, proxies, certificate validation, logging, monitoring, backup and restore, and failure recovery. Measure operational effects that matter to the system—such as handshake behavior, message sizes, device memory, latency, or firmware image handling—under your own conditions. Do not enable experimental algorithms in production merely to claim progress.
Plan trust and signing transitions
Software and firmware signatures can outlive the systems that verify them. Inventory signing keys, certificate chains, timestamping, update manifests, bootloaders, recovery images, and offline procedures. A migration plan should specify how old and new signatures are accepted during a controlled transition, how compromised or retired keys are revoked, and how devices that cannot be upgraded are isolated or replaced.
Coordinate suppliers and contracts
For every supplier-dependent record, create an action with an owner, requested evidence, target product version, test window, and fallback plan. Procurement should ask whether cryptography is configurable, which components require a firmware or hardware change, how long the supplier will support the current product, and how certificates and signing keys are migrated. Capture commitments in the same system as internal remediation work.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep the inventory current and useful
An inventory is a continuing operating process, not a one-time checklist. Assign a status and owner to every record, and update it when systems, certificates, libraries, endpoints, vendors, or signing flows change. Trigger updates from events such as a new application release, certificate issuance or renewal, network exposure change, cloud-service onboarding, device-fleet update, supplier release, or retirement.
The sources reviewed do not prescribe one refresh interval for every organization. Set an organization-defined review schedule based on change volume and risk, then supplement it with event-driven updates. Re-run discovery after major architecture changes and periodically sample records for stale ownership, expired certificates, unreported dependencies, and unexplained algorithm changes.
Track useful measures without confusing activity with readiness:
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- Percentage of records with confirmed algorithm, purpose, evidence, and protected-data classification.
- Number of unknown or contradicted findings awaiting validation.
- Number of high-priority systems with an approved migration design and test plan.
- Supplier products lacking a documented upgrade path.
- Signing and trust-root dependencies that could block an emergency update.
Use the inventory to define requirements for crypto agility. NIST describes crypto agility as the ability to adapt or replace algorithms across protocols, applications, software, hardware, firmware, and infrastructure while preserving security and operations. In practice, that means avoiding hard-coded algorithm assumptions, centralizing policy where possible, separating keys and certificates from application code, supporting controlled configuration changes, and testing replacement paths before they are urgent.
How to evaluate discovery approaches and tools
When comparing an internal process or software utility, judge it against the inventory’s purpose rather than a headline scan count.
- Coverage: Can it examine code, configuration, endpoints, certificates, cloud services, embedded or OT systems, and vendor-managed technology?
- Evidence quality: Does every finding show how it was detected, when, under what access conditions, and with what limitations?
- Business mapping: Can a finding be linked to an owner, data classification, business process, dependency, and remediation ticket?
- Operational impact: Can discovery run safely on sensitive networks and fragile devices without changing state?
- Scale and repeatability: Can it be rerun, deduplicated, compared over time, and used for event-driven updates?
- Integration: Can results be exported to asset, certificate, configuration, vulnerability, and risk systems without losing context?
- Secret handling: Does it collect metadata while avoiding secret key material, and can access be controlled and audited?
NIST’s named scanners and certificate-search examples can accelerate initial discovery, but the FAQ explicitly notes that its tool list is not exhaustive. A tool that sees only externally observable TLS behavior is valuable for that surface; it should not be represented as proof of complete organizational visibility.
Common inventory failures and recovery actions
“We scanned the internet, so we are done.”
External scans miss internal services, dormant code, private trust stores, embedded devices, and vendor-managed functions. Add code and configuration review, certificate enumeration, owner interviews, and supplier questionnaires. Mark unobserved areas as coverage gaps rather than silently treating them as clear.
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An algorithm without purpose, data classification, owner, and dependency cannot support a migration decision. Split records by use and attach the business process, protected data, protocol, and dependent clients or services.
“We copied private keys into the tracking system.”
Remove secret material immediately, rotate any key that may have been exposed, and retain only metadata such as key type, owner, algorithm, certificate relationship, expiry, storage location, and lifecycle state.
“The vendor says it is quantum-safe, but there is no evidence.”
Request the product version, supported algorithms and protocols, configuration instructions, validation documentation, signing dependencies, and upgrade or replacement timeline. Record the response and confidence level, and test the claimed behavior where safe.
“We gave every finding the same deadline.”
Re-score by confidentiality lifetime, public-key exposure, business impact, signing role, supplier dependency, and feasibility. Keep unresolved uncertainty visible; a low-confidence critical system may deserve investigation before a high-confidence low-impact service is changed.
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A repeatable operating checklist
- Approve scope covering IT, OT, cloud, hosted services, embedded technology, certificates, and signing flows.
- Name an accountable owner and participating architecture, operations, application, OT, procurement, and supplier contacts.
- Choose the controlled system of record and prohibit secret key material.
- Discover use through source and configuration review, endpoint inspection, certificate enumeration, asset records, owner interviews, and vendor engagement.
- Create separate records for each algorithm purpose, protocol, environment, and dependency.
- Attach evidence, discovery dates, coverage limits, confidence, and ownership.
- Deduplicate and reconcile findings across discovery methods.
- Map algorithms and purposes to current standards and applicable sector or jurisdiction requirements.
- Rank systems by confidentiality lifetime, quantum-vulnerable public-key use, criticality, exposure, signing role, supplier dependency, and upgrade feasibility.
- Assign migration designs, tests, supplier actions, deadlines, and fallback plans to the highest-priority records.
- Update records on material change and according to an organization-defined review schedule.
- Use lessons from each migration to improve crypto agility and the next inventory cycle.
NIST mathematician Dustin Moody summarized the urgency this way: “We encourage organizations to begin their transition to these standards immediately to ensure their data remains secure in the quantum era.” Starting with a defensible inventory turns that advice into an actionable sequence: discover, verify, prioritize, migrate, and keep the map accurate as technology changes.
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