The practical starting point for post-quantum work is a scoped cryptographic inventory. Combine automated discovery with interviews and structured requests to system owners, application teams, procurement staff and suppliers. Record which algorithms and cryptographic functions each system uses, why it uses them, what data and services depend on them, and who can change them. Then rank the findings by business impact, exposure to quantum-vulnerable public-key cryptography, data-confidentiality lifetime and replacement effort.
What is a cryptographic inventory?
A cryptographic inventory is a maintained record of cryptography across an organization’s systems, applications, services, devices and data flows. It is more than a list of algorithms. A useful record connects an observation—such as an RSA certificate, an ECDH handshake or a firmware-signing key—to its purpose, location, owner, protected information, dependencies, supplier and replacement constraints.
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The inventory should describe cryptographic metadata, not secrets. Record a key’s type, associated algorithm, owner, application, expiration date and lifecycle status, but never copy private keys, seed material or other key material into the inventory. Treat the inventory as an operational system of record with access controls, change history and a clear maintenance owner.
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Why post-quantum inventory work matters now
Large-scale quantum computers could eventually undermine widely deployed public-key techniques used for key establishment and digital signatures. The exposure is not uniform: symmetric encryption and hashing generally require different transition treatment from public-key algorithms, and the urgency depends on the information protected and the role cryptography plays.
Some encrypted information has a confidentiality lifetime measured in years or decades. An attacker can copy encrypted traffic or archives today and attempt to decrypt it later, a risk commonly described as “harvest now, decrypt later.” Systems that create or validate signatures also deserve attention: a compromised signing algorithm can affect software updates, firmware, documents, certificates and trust decisions long after the original transaction.
NIST finalized its first three post-quantum cryptography standards in 2024 and encourages organizations to begin transitioning. Dustin Moody, who leads NIST’s post-quantum cryptography standardization project, said: “We encourage organizations to begin their transition to these standards immediately to ensure their data remains secure in the quantum era.” That encouragement is not a universal replacement deadline. Each organization still needs to assess dependencies, supplier support, interoperability and the time required to test a change safely.
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The joint CISA, NSA and NIST fact sheet dated August 17, 2023, recommends early planning, inventories of quantum-vulnerable assets, risk assessment and vendor engagement. NIST’s draft IR 8547, published November 12, 2024, describes a planned transition from quantum-vulnerable algorithms to post-quantum digital-signature and key-establishment standards. Its comment period closed January 10, 2025; it was an initial public draft at that point, so verify its current status before using it as a formal deadline or policy requirement.
Define the scope and ownership before scanning
Write down what the first inventory covers and who is accountable for keeping it current. A small, explicit scope is better than an organization-wide claim that nobody can validate. Expand it in controlled waves.
- Enterprise IT: servers, endpoints, identity systems, databases, backup platforms, storage and internal applications.
- Cloud and hosted services: managed databases, content delivery, API gateways, hosted email, SaaS integrations and provider-managed certificates.
- Network services: TLS, SSH, VPN, wireless authentication, directory protocols and service-to-service encryption.
- Applications and libraries: source code, third-party packages, runtime configuration, cryptographic APIs and hard-coded protocol choices.
- Software and firmware signing: build systems, update servers, signing appliances, package repositories, boot chains and validation mechanisms.
- Devices and operational technology: embedded products, industrial controllers, medical or building systems and offline environments where relevant.
- Data stores and flows: archives, backups, replicated data, message queues and transfers to suppliers or partners.
- Supplier products: appliances, managed services, libraries and components whose cryptography your organization cannot directly inspect.
Assign an inventory owner, a technical steward for each business area and an approval path for exceptions. Define how a new service, certificate, library or supplier will be added, how findings are reviewed, and how retired assets are removed. Include procurement and architecture teams so cryptographic requirements appear in purchasing and design decisions rather than only during an emergency.
What belongs in the inventory?
| Record category | Capture | Why it matters |
|---|---|---|
| Algorithms and functions | Algorithm, mode or parameter set, purpose, implementation and whether it is public-key, symmetric, hashing or post-quantum | Shows which uses may be quantum-vulnerable and what replacement function is required |
| Protocols and services | TLS, SSH, VPN, email encryption, authentication, code signing and other protocol roles | Connects an algorithm to a negotiation path and its interoperability constraints |
| Keys and certificates | Key type, algorithm, owner, application, creation and expiration dates, lifecycle state, certificate chain and trust anchor | Enables ownership, renewal and migration planning without collecting key material |
| Systems and components | Hosts, applications, libraries, hardware security modules, appliances, firmware and cloud services | Identifies where a change must be implemented and tested |
| Protected information | Data classification, confidentiality lifetime, regulatory or contractual obligations and locations | Allows long-lived and high-impact data to receive appropriate priority |
| Dependencies and suppliers | Upstream and downstream systems, vendor, product version, support contact and replacement constraints | Prevents a local upgrade from breaking a dependent service or trust chain |
| Evidence and confidence | Discovery method, timestamp, configuration or code reference, validation status and confidence level | Distinguishes a verified absence from an unobserved dependency |
Keep algorithm names tied to purpose. “RSA-2048” alone is ambiguous: it might identify a TLS certificate, a signing key, an SSH host key or an offline archival process, each with different migration implications. Likewise, record whether a library is merely present or whether an application actually invokes it.
How to discover cryptography from multiple angles
No single scanner sees an entire estate. Use overlapping methods and preserve the evidence behind each finding.
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Analyze source code, binaries and configuration
Search source repositories, dependency manifests, container images, build scripts and configuration for algorithm names, cryptographic APIs, certificate paths, protocol settings and disabled or legacy options. Binary analysis can reveal statically linked libraries or firmware components that source-code searches miss. Treat a string match as a lead, not proof of runtime use; confirm call paths, feature flags and deployed versions.
Scan network-facing services
Probe approved TLS and SSH endpoints, VPN gateways, mail services and other negotiated protocols. Capture certificate chains, supported cipher suites, key-exchange groups, signature algorithms and protocol versions. Schedule scans safely, rate-limit them and coordinate with operations teams, especially for fragile or operational-technology systems. A perimeter scan cannot reveal an offline signer, an internal library or a supplier-managed service that is not exposed to the scan.
Mine certificate and asset records
Use certificate-authority records, certificate stores, load-balancer inventories, DNS data, cloud control planes, configuration-management databases and software-asset records. Certificate transparency searches such as crt.sh can help identify certificates issued for domains or organizations, but reconcile results with internal ownership and include certificates for private names and non-public services that external records cannot show.
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Ask owners and suppliers directly
Send structured questionnaires to application owners, infrastructure teams and suppliers. Ask which algorithms and protocols are used, where keys are generated and stored, how signing and validation work, whether hybrid or post-quantum options exist, what versions support them, and what upgrade or replacement lead time applies. Require product version, deployment model and evidence rather than a generic statement that a product is “quantum safe.”
Include procurement and lifecycle events
Review contracts, statements of work, product roadmaps and end-of-support dates. A supplier may control a cryptographic library or firmware update mechanism even when your team owns the surrounding application. Capture renewal dates and replacement lead times so a migration can align with planned upgrades instead of forcing an unsupported emergency change.
A six-step inventory workflow
1. Set scope, roles and success criteria
Define the business units, environments and asset classes in the first wave. Name accountable owners and decide what counts as sufficient evidence. Establish handling rules for sensitive configuration and a change process for new findings.
2. Collect initial observations
Run code and configuration analysis, approved network scans, certificate searches and asset-record queries in parallel with owner and supplier questionnaires. Record the collection date, tool or source and exact location of each observation.
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Map inconsistent names to a controlled vocabulary for algorithms, protocols, systems and business owners. Add purpose, protected data, dependencies, supplier, lifecycle dates and replacement constraints. Link multiple observations to one asset rather than creating duplicate records.
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4. Validate with people and evidence
Ask owners to confirm whether a finding is deployed, reachable, active and business-critical. Reconcile scanner output with source code, runtime configuration, procurement records and supplier statements. Mark unknowns explicitly and assign follow-up tasks; an unobserved dependency is not evidence that no dependency exists.
5. Score risk and migration difficulty
Assess confidentiality lifetime, data sensitivity, business criticality, public-key use, signature or key-establishment role, downstream dependencies, operational constraints, supplier support and replacement lead time. Separate cryptographic risk from general vulnerability severity so a low-exploitability service protecting long-lived secrets is not automatically ignored.
6. Convert priorities into a backlog and repeat
Create migration work items with an owner, target date, dependency list, test plan, interoperability requirements and exception path. Re-run discovery after major releases, certificate renewals, supplier changes, architecture changes and standards updates. An inventory that is never refreshed quickly becomes a historical report rather than a planning tool.
How to identify systems that need post-quantum upgrades
Use the inventory to find systems where a quantum-vulnerable public-key function is both important and difficult to replace. The following categories usually deserve early analysis:
- Key establishment and transport: TLS, VPN, SSH, messaging and API connections that use public-key exchange to establish session keys.
- Digital-signature creation: certificate authorities, code-signing services, firmware and software update systems, document-signing platforms and release pipelines.
- Digital-signature validation: bootloaders, package managers, browsers, identity systems and any service that decides whether an update or credential is trusted.
- Long-lived confidential data: archives, health or financial records, intellectual property, government information and backups whose confidentiality must last for many years.
- High-dependency infrastructure: identity, trust anchors, service meshes, hardware security modules and shared libraries used by many applications.
- Hard-to-replace or long-lived equipment: embedded and operational-technology devices with infrequent firmware updates, constrained memory or long procurement cycles.
Do not label every symmetric algorithm or hash as requiring the same replacement. Record its parameters and security role, then evaluate it within the organization’s standards and risk process. The inventory’s purpose is to expose where a post-quantum change is needed, where a design can be made crypto-agile, and where evidence is still missing.
Prioritize with a transparent decision framework
| Priority factor | Questions to answer | Typical effect on priority |
|---|---|---|
| Data sensitivity and lifetime | How harmful would disclosure be, and how long must confidentiality last? | Long-lived, highly sensitive data moves earlier |
| Cryptographic role | Does the component establish keys, create signatures, validate signatures or only provide a supporting function? | Key establishment and trust decisions generally require deeper transition planning |
| Business criticality | Would failure interrupt safety, revenue, identity, legal obligations or essential operations? | Critical services receive dedicated testing and rollback planning |
| Dependency reach | How many applications, tenants, suppliers or devices depend on it? | Shared roots and libraries need coordinated sequencing |
| Replacement lead time | Can the owner update software this quarter, or is new hardware and certification required? | Long-lead systems start earlier even when their exposure is indirect |
| Supplier and standards support | Is a supported implementation available, and does the supplier publish a tested path? | Unclear support creates an investigation or procurement work item |
| Operational constraints | Are there bandwidth, latency, memory, offline or safety limits? | Constrained environments need lab testing and staged deployment |
Use a documented scoring method, but do not hide judgment behind a single number. Preserve the reasons for a ranking and the evidence supporting it. A system with a moderate score but a two-year hardware replacement cycle may need to begin before a higher-scoring application that can be upgraded in a sprint.
What are some existing tools that can be used for cryptographic inventorying?
NIST’s inventory FAQ names examples, not an exhaustive list or a comparative ranking. Capability, supported platforms, licensing, data handling and maintenance can change, so verify each tool directly before deployment.
| Tool or resource | Named use | Important qualification |
|---|---|---|
| pqcscan | Scanning SSH and TLS servers | Network visibility does not establish coverage of source code, offline systems or supplier components |
| sslscan2 | Testing SSL/TLS-enabled services and discovering supported cipher suites | Results need asset ownership and business-purpose context |
| crt.sh | Finding SSL/TLS certificates issued for domains or organizations | External certificate records do not replace internal certificate stores or private-service discovery |
| cyberzero PQC Edge Scanner | Looking for post-quantum transition signals at a domain’s public edge | Edge observations are only one part of an enterprise inventory |
| SandboxAQ AQtive Guard | Listed by NIST among collaborator tools for cryptographic inventory work | Confirm current scope, deployment model and support directly |
| Data-Warehouse PCert | Listed by NIST among collaborator tools | Validate supported environments and export or integration options |
| Keyfactor AgileSec | Listed by NIST among collaborator tools | Check current product capabilities, licensing and maintenance |
| Cisco Mercury | Listed by NIST among collaborator tools | Confirm what evidence it collects and how it handles restricted environments |
| Tychon Cryptographic Inventory | Listed by NIST among collaborator tools | Verify coverage and ownership workflows for your estate |
| CodeQL | Listed in the collaborator-tool section; open source | Useful for code analysis, but code findings must be connected to deployed assets and runtime configuration |
| PQC Coalition Inventory Workbook | Starting point for centrally tracking migration by system or asset | A workbook needs an owner, access controls, validation rules and a process for keeping it current |
NIST also points readers toward the CycloneDX cryptographic bill-of-materials guidance for CBOM work and to migration resources such as the Netherlands PQC Migration Handbook, Canadian quantum-readiness guidance, ETSI TR 104 016 and the MITRE PQC Migration Roadmap. Use these as planning references and verify their current editions.
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How to compare scanners and inventory platforms
Do not choose a tool because it produces the longest list. Compare the evidence and the operational work required to turn findings into migration decisions.
| Comparison axis | What to examine |
|---|---|
| Coverage | Source code, binaries, configurations, network protocols, certificates, cloud services, endpoints, embedded or operational-technology systems and supplier products |
| Evidence quality | Whether each finding shows algorithm, purpose, location, owner and dependency, and whether an operator can reproduce it |
| Deployment and access | Agentless or agent-based operation, required permissions, offline support, data handling, scan safety and network impact |
| Integration | Asset management, software bills of materials, vulnerability management, procurement, ticketing and governance workflows |
| Maintainability | Update cadence, supported platforms, export formats, ownership, audit history and ability to rerun discovery |
| Migration utility | Dependency mapping, prioritization, crypto-agility planning, interoperability testing and reporting |
NIST does not provide comparative test results or declare one listed tool best. A sensible evaluation uses a representative pilot: include a public service, an internal application, a container or build pipeline, a certificate authority, an offline or embedded asset and a supplier-managed service. Measure false positives, missed dependencies, evidence quality, operator effort and the ease of exporting records into your backlog.
Turn inventory findings into a migration backlog
Each high-priority record should become an actionable work item rather than a note that says “replace RSA.” A useful item contains:
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- Current algorithm, protocol role, implementation and deployed version.
- Data protected, confidentiality lifetime and business impact.
- Upstream and downstream dependencies, trust anchors and validation paths.
- Target post-quantum or hybrid design, subject to approved standards and supplier support.
- Required software, hardware, certificate, key-management or contract changes.
- Performance, packet-size, memory, latency and interoperability tests.
- Deployment stages, monitoring, rollback method and exception approval.
- Target date, acceptance evidence and the next inventory review date.
Plan shared foundations first when they unblock many systems: identity, certificate issuance, signing infrastructure, libraries, service meshes and common gateways. In parallel, investigate long-lead devices and supplier products so a missing upgrade path is visible before a contract or hardware decision becomes irreversible.
Build a migration-ready record
A structured record can be represented in a spreadsheet, database or cryptographic bill of materials. The format matters less than consistent fields and evidence. For example:
{
"asset": "release-signing-service",
"owner": "software-platform-team",
"function": "creates signatures for application updates",
"algorithm": "public-key signature algorithm; exact parameter set recorded separately",
"location": "build environment and signing appliance",
"protected_data": "software release integrity",
"dependencies": ["update repository", "device validators", "certificate chain"],
"supplier": "not applicable",
"evidence": "configuration review and owner confirmation",
"confidence": "high",
"replacement_constraint": "firmware validators require coordinated update",
"priority": "high",
"next_action": "test supported post-quantum or hybrid signing path"
}
Keep the exact algorithm and parameter values in the controlled fields; the example deliberately emphasizes the relationships that make a finding useful. Store evidence references and timestamps so a reviewer can determine whether a record describes the current deployment.
Common inventory failures and how to correct them
Relying on one perimeter scan
Failure: The scan finds public TLS services but misses internal libraries, offline signers, embedded devices and supplier-controlled cryptography.
Correction: Combine code and configuration analysis, certificate and asset records, network observations, owner interviews and supplier questionnaires.
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Collecting algorithm names without purpose
Failure: A list of “RSA,” “ECC” or “AES” cannot show what would break or which data is at risk.
Correction: Record the protocol role, data protected, owner, location, dependencies and lifecycle constraints with every observation.
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Treating missing evidence as absence
Failure: A scanner returns no result and the record is marked “not used.”
Correction: Record unknown status and confidence, assign a validation owner and state what the discovery method could not see.
Ignoring signatures
Failure: The program focuses on encrypted network traffic and overlooks software and firmware update trust chains.
Correction: Inventory both signature creation and validation, including build systems, signing services, bootloaders, package managers and field-update mechanisms.
Assuming a supplier statement is sufficient
Failure: “Quantum-ready” appears in a product response without a version, configuration, test evidence or supported migration path.
Correction: Request the exact supported algorithms, deployment constraints, upgrade sequence, interoperability results, support dates and responsibility boundaries.
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Failure: The inventory is accurate on the day it is delivered but misses new certificates, libraries, services and acquisitions.
Correction: Tie updates to architecture review, procurement, release, certificate renewal and decommissioning processes, and schedule recurring discovery.
Where can you start your migration to PQC?
Start with assets that combine quantum-vulnerable public-key use, long-lived or sensitive information, high business impact, broad dependency reach or long replacement lead time. Establish a small pilot that exercises discovery, design, interoperability testing, staged deployment and rollback. Use the results to refine inventory fields and supplier questions before expanding.
Maintain crypto-agility as a design requirement: isolate algorithm choices behind configurable interfaces, avoid hard-coded certificate and key assumptions, support versioned negotiation, and test the ability to rotate algorithms without rewriting an entire application. Crypto-agility does not remove the need to migrate; it reduces the cost and risk of future changes.
Coordinate the roadmap with standards and suppliers. NIST’s finalized 2024 standards, the joint CISA/NSA/NIST guidance and the status of IR 8547 provide useful context, but they do not establish one schedule for every organization. Recheck standards status, product support and regulatory obligations as the roadmap proceeds.
A practical first 90 days
- Days 1–15: appoint an accountable owner, define scope, classify protected data and select representative systems, including signing and validation paths.
- Days 16–30: collect asset, certificate, software and supplier records; run approved TLS and SSH discovery; begin source and configuration analysis.
- Days 31–45: normalize findings, remove duplicates, link owners and dependencies, and mark unknowns and confidence levels.
- Days 46–60: validate high-impact findings with system owners, procurement and suppliers; confirm whether observations are deployed and active.
- Days 61–75: score confidentiality lifetime, criticality, public-key role, dependency reach, operational constraints and replacement lead time.
- Days 76–90: approve a prioritized backlog, select pilot migrations, define test and rollback evidence, and schedule recurring inventory updates.
The deliverable at the end of this period should be a defensible map of cryptographic use and uncertainty, not a claim that every asset has already been upgraded. That map lets leadership fund the systems that need the longest preparation and gives engineering teams concrete, testable migration work.
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