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The reliable way to find quantum-vulnerable TLS is to build a cryptographic inventory, then verify each certificate against the live TLS handshake. Certificate metadata tells you what an X.509 certificate contains; an authorized endpoint scan tells you which key-exchange groups, signature schemes, protocol versions, and cipher suites the service can actually negotiate. You need both views because a certificate can look modern while its gateway, proxy, or load balancer still permits quantum-vulnerable public-key algorithms.
Use certificate-transparency records for public discovery, exports and asset records for internal discovery, and timestamped scans for live behavior. Map every finding to an owner, API, dependency, data-retention requirement, and replacement lead time so the result becomes a migration plan rather than an unprioritized list.
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What “quantum-vulnerable” means for TLS and APIs
NIST’s transition guidance treats today’s widely deployed public-key cryptography as vulnerable to a sufficiently capable quantum computer. For a TLS and API inventory, the practical flags are RSA, finite-field Diffie–Hellman, and elliptic-curve public-key algorithms used for signatures or key establishment. Record where each algorithm appears: in the certificate, the handshake, a gateway, a load balancer, a reverse proxy, a service mesh, or an application library.
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Symmetric algorithms and hashes need their own strength and policy review. Do not label an endpoint quantum-vulnerable solely because it uses a particular AES mode or SHA family. The inventory should record those choices, but the quantum-transition flag in this workflow is driven by public-key signatures and key establishment.
NIST’s Initial Public Draft of IR 8547, published November 12, 2024, describes the transition away from existing quantum-vulnerable standards toward post-quantum key-establishment and signature standards. NIST released three post-quantum cryptography FIPS standards in August 2024. Those milestones make an inventory useful now, but migration remains an ongoing transition, not a one-time scan.
Start by defining scope and ownership
Discovery fails when teams scan only the obvious public web tier. Write down the systems and environments that can terminate TLS or carry API traffic, and assign an owner before collecting data.
- Public domains, subdomains, wildcard domains, and alternate names.
- Private DNS zones and internal service names.
- API gateways, ingress controllers, load balancers, reverse proxies, and web application tiers.
- Service-mesh sidecars and east–west service endpoints.
- Application hosts, machine-to-machine APIs, and administrative interfaces.
- Cloud load-balancing identities, managed certificate stores, secret-management records, and certificate-authority accounts.
Give every asset an environment such as production, staging, development, or disaster recovery. Record a technical owner and a business owner. Include the port and service identity, not just a DNS name; the same hostname can expose different TLS services on different ports or through different front ends.
Obtain authorization for active testing. Certificate-transparency collection is passive, but endpoint enumeration and handshake probing can trigger security controls or affect fragile systems. Define permitted source addresses, testing windows, SNI names, ports, and rate limits before a scan begins.
Discover public certificates with certificate-transparency data
Certificate-transparency data is a practical first pass for public assets. Services such as crt.sh let you search issued certificates for a domain or organization. Export the certificate identifiers and names, then de-duplicate by certificate fingerprint. Include expired and revoked certificates in the historical set when they help explain an endpoint or an uncompleted renewal; classify their current status separately.
Public records are a discovery source, not proof that a certificate is still deployed. For each certificate, try to connect it to a live endpoint by matching subject names and SANs with DNS, inventory records, and an authorized TLS observation. A wildcard certificate may front many APIs, while the same API can have different public and internal certificates.
Record the transparency search date and the organization or domain query used. Keep the original certificate or a durable fingerprint so a later reviewer can reproduce why an asset was included, excluded, or linked to another certificate.
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Find internal certificates and endpoints
Internal systems are rarely visible in public certificate-transparency logs. Export certificate stores and listener configurations from load balancers, ingress controllers, API gateways, service meshes, reverse proxies, and application hosts. Pull corresponding identities from private DNS, the configuration-management database, cloud inventories, and secret-management systems.
Look for certificates that are mounted as files, injected as secrets, referenced by an appliance object, or generated automatically by an internal certificate authority. Include east–west traffic and mutual-TLS clients: a service that never appears in a browser-facing scan can still authenticate with an RSA or elliptic-curve certificate.
Normalize aliases and duplicate records. One certificate fingerprint can be attached to several listeners, and one listener can rotate between certificates during a renewal window. Keep the relationship rather than collapsing it into a single row; the deployment path matters when you schedule replacement.
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Observe the live TLS configuration
Use an authorized TLS scanner such as sslscan2 to enumerate protocol versions, supported cipher suites, signature algorithms, and key-exchange groups. Where SSH or TLS post-quantum transition signals are relevant, NIST identifies pqcscan as another scanning option. Choose a scanner version approved by your security team and store it with the result.
Run the test against the actual listener and supply the correct SNI name. Capture the source address, destination address, port, SNI, environment, UTC timestamp, scanner name and version, and any client profile used. A scan without this context cannot show which virtual host or policy produced the result.
Distinguish capabilities from the negotiated result. A server may support several groups and signatures but select one based on the client’s offer. Store both the complete supported set and the algorithm selected in a representative handshake. If policy requires a particular post-quantum or hybrid option, test a client that offers it and a client that does not; “supported” and “required in production” are different states.
Active scans should be repeatable and bounded. Start with one connection profile, then expand to approved profiles when you need to understand client compatibility. Do not infer an internal service’s behavior from a public proxy scan if the proxy terminates and re-encrypts traffic; scan each termination point that has a separate cryptographic policy.
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Inspect certificate and chain fields
For every certificate that can be linked to an endpoint, record the fields NIST SP 1800-16 calls for in a TLS server-certificate inventory:
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- Certificate fingerprint and serial identifier.
- Subject and every Subject Alternative Name (SAN).
- Issuer and the complete presented chain.
- Public-key algorithm and key size.
- Certificate-signature algorithm and hash.
- Not-before and not-after dates.
- Revocation status and the method used to check it.
- Renewal source, automation account, and renewal owner.
Do not treat a large key size as proof of quantum safety. RSA and elliptic-curve keys can meet current classical policies and still require migration analysis. Likewise, a certificate signed by a newer-looking hash does not remove a vulnerable public-key key-establishment option offered by the server.
Preserve the raw certificate and chain alongside normalized fields. Parsing errors, missing intermediates, and unusual extensions are easier to resolve when an investigator can compare the normalized row with the original object.
Join certificates to the API and service inventory
Certificate records become actionable when they are connected to the software and data they protect. For each endpoint, add:
- API product, route family, hostname, port, and environment.
- Gateway, proxy, load balancer, ingress controller, service-mesh component, or application library that terminates TLS.
- Upstream and downstream services, including partner or internal dependencies.
- Technical owner, business owner, and certificate-renewal owner.
- Data sensitivity, retention period, and whether traffic contains information that must remain confidential for many years.
- External exposure, replacement lead time, migration status, and an exception owner when the endpoint cannot yet change.
Maintain many-to-many relationships. A single certificate can front dozens of routes, and one API can have separate public, private, staging, and mutual-TLS certificates. If you flatten those relationships into one hostname column, you lose the dependency information needed to plan a coordinated change.
Classify quantum exposure without overclaiming
Apply a consistent classification to the certificate and live handshake records:
| Finding | What it means | Recommended inventory state |
|---|---|---|
| RSA, finite-field Diffie–Hellman, or elliptic-curve public-key signature or key establishment is present | The endpoint uses a classical public-key mechanism that belongs in the post-quantum migration analysis. | Quantum-vulnerable mechanism observed |
| A hybrid or post-quantum option is advertised by the endpoint | The implementation has a transition capability, but the scan does not prove that production clients use or require it. | Supported; production requirement not established |
| A hybrid or post-quantum option is negotiated in an approved client test | The tested client and server completed a transition-mode handshake. | Negotiated in test; verify policy and coverage |
| No relevant public-key detail was obtained | The observation is incomplete, not evidence of safety. | Unknown; rescan or obtain configuration evidence |
Keep certificate and handshake findings separate. A certificate may contain an elliptic-curve public key while the endpoint also offers classical finite-field groups; both facts belong in the record. Conversely, a certificate can be acceptable under a planned policy while a legacy proxy in front of it still permits a classical key exchange.
Do not publish a made-up adoption percentage. No authoritative figure establishes what share of all TLS or API endpoints is currently quantum-vulnerable. Your inventory should report your measured population, scope, date, and method instead.
Prioritize the migration queue
Not every finding has the same urgency. Rank the work using exposure, data lifetime, business value, and the difficulty of replacing the component.
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- External exposure: place internet-facing gateways, public APIs, and partner endpoints near the front of the queue because they are reachable by untrusted clients and often have long interoperability cycles.
- Long-lived sensitive data: elevate systems carrying records that must remain confidential for many years. Adversaries can collect encrypted traffic now and attempt to decrypt it later.
- High-value assets: prioritize identity, payment, administrative, and control-plane services whose compromise would have broad consequences.
- Replacement lead time: start early on appliances, embedded clients, proprietary libraries, and partner integrations that require procurement, firmware, certification, or coordinated releases.
- Dependency concentration: identify a gateway or service-mesh policy that fronts many APIs. Updating one well-understood termination point may remove a large portion of exposure, but only after every client and upstream path is tested.
Keep the owner and dependency links in the priority record. A severity label without a named team and a change path does not create a schedulable migration task.
Plan crypto-agile remediation
Use the inventory to test standards-based post-quantum replacements and hybrid modes in the exact TLS stack that will run in production. The test scope should include clients, API gateways, load balancers, reverse proxies, service-mesh sidecars, monitoring agents, certificate issuance, and any hardware security modules or policy engines in the path.
Test the complete connection path
Verify certificate issuance and validation, handshake negotiation, session resumption, mutual-TLS authentication, observability, and failure behavior. A server-side change is not complete if an older client cannot connect, a health check fails, or a monitoring system rejects a larger certificate or handshake message.
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Document whether a transition algorithm is merely enabled, preferred, or required. Record the client populations that can use it and the fallback behavior for clients that cannot. A hybrid mode that is never selected in production should not be counted as deployed protection.
Stage changes by dependency
Begin with a representative nonproduction route, then test production-like traffic and rollback procedures. Coordinate certificate renewal, gateway policy, client-library upgrades, and partner schedules. Keep an exception with an owner and an expiry date when a component cannot yet move.
Make policies crypto-agile
Avoid hard-coding one algorithm or curve into application code, appliance templates, or certificate automation. Use configurable policy, versioned deployment artifacts, and monitoring that can detect both the intended transition mode and an unexpected fallback to a classical mechanism.
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The following fields provide enough context to reproduce a finding and decide what to do next.
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|---|---|---|
| Asset and endpoint | Hostname, IP or service identity, port, SNI, environment, API owner, business owner | Identifies the listener and assigns responsibility. |
| Certificate | Fingerprint, subject and SANs, issuer, chain, public-key algorithm, key size, certificate-signature algorithm, hash, validity dates, revocation status, renewal source | Shows what was issued and how it is managed. |
| Live TLS | Protocol versions, key-exchange groups, signature schemes, supported cipher suites, negotiated result, client-authentication mode, scanner timestamp and version | Shows what the endpoint can and did negotiate. |
| Dependencies and risk | Gateway, proxy, or library; upstream and downstream services; data sensitivity and retention; external exposure; replacement lead time; migration status; exception owner | Turns a technical finding into a sequenced work item. |
Choose discovery methods by the question you need to answer
| Approach | Coverage | Observation depth | Operational profile | Best use |
|---|---|---|---|---|
| Certificate-transparency search | Public certificates visible in transparency logs | Certificate names, issuer, dates, and public-key metadata | Passive | Find unknown public names and certificates. |
| Internal exports and records | Private listeners, stores, gateways, meshes, and hosts | Configured certificates and deployment relationships | Low-impact collection from owned systems | Build the private-asset population. |
| Authorized active TLS scan | Reachable listeners for approved addresses, ports, and SNI names | Supported and negotiated protocols, groups, signatures, and ciphers | Active; requires permission and rate controls | Verify live behavior and policy enforcement. |
| CMDB, DNS, cloud, and secret-management correlation | Ownership, environment, dependency, and lifecycle context | Operational and business metadata | Record integration | Assign priority and replacement responsibility. |
A repeatable end-to-end runbook
- Set boundaries: list domains, private zones, gateways, proxies, meshes, hosts, ports, environments, and approved scan sources. Assign owners.
- Collect public evidence: query certificate-transparency data such as crt.sh for domains and organizations; export results and de-duplicate by fingerprint.
- Collect internal evidence: export certificate stores and listener configurations from every TLS termination layer, then correlate them with DNS, CMDB, cloud, and secret-management records.
- Normalize identities: resolve aliases, wildcard names, duplicate certificates, rotation windows, and separate public versus internal deployments.
- Scan authorized listeners: use sslscan2, and pqcscan where its SSH/TLS transition signals apply. Supply the correct SNI and record source address, port, timestamp, and scanner version.
- Store raw and parsed results: preserve certificates, chains, scanner output, and normalized fields so another analyst can reproduce the finding.
- Join records: map each certificate and handshake to an API route, gateway or library, owner, dependency, environment, and data-retention profile.
- Classify: flag RSA, finite-field Diffie–Hellman, and elliptic-curve public-key signatures or key establishment; separately record hybrid or post-quantum support and whether it is required.
- Prioritize: rank external exposure, long-lived sensitive data, high-value assets, dependency concentration, and replacement lead time.
- Plan and validate: test standards-based post-quantum and hybrid configurations across clients and infrastructure, then schedule staged changes with rollback and exception ownership.
Common failure modes and how to correct them
“The certificate looks modern, so the API is safe.”
Correct this by scanning the live listener. Certificate metadata cannot show every key-exchange group or signature scheme the endpoint offers.
“A public scan found nothing, so the internal API is clear.”
Export internal stores and configurations, then scan authorized private listeners. Private DNS names, service-mesh endpoints, and mutual-TLS clients do not appear in public transparency data.
“The server supports a post-quantum option, so migration is complete.”
Record support, negotiation, and production enforcement as separate states. Test representative clients and verify that policy does not silently fall back to a classical mechanism.
“One hostname equals one certificate and one service.”
Keep many-to-many relationships. Wildcards can front many APIs, and one API can have distinct certificates for public, private, staging, and mutual-TLS paths.
“A single scan is an enduring answer.”
Re-scan after certificate renewal, gateway or library upgrades, and TLS-policy changes. Store timestamps, versions, raw output, and exceptions so an auditor can distinguish a current state from an old observation.
“The inventory is complete when it has algorithm names.”
Add ownership, dependencies, data sensitivity, retention, exposure, and replacement lead time. Those fields determine which findings can be fixed first and which changes require coordinated releases.
Keep the evidence current
NIST’s NCCoE defines a cryptographic inventory as “a descriptive record of the cryptography used across an organization’s systems, applications, services, devices, and data flows.” It also states that maintaining one is important for quantum readiness because an organization cannot effectively prioritize or migrate cryptography it has not identified. NIST SP 1800-16 makes the operational point directly: “This visibility is achieved by maintaining an inventory of all TLS server certificates.”
Set a refresh trigger for certificate renewal, gateway and load-balancer changes, TLS-library upgrades, service-mesh policy updates, and new API launches. Keep the previous observation rather than overwriting it. A time series reveals an accidental reintroduction of RSA or a classical key-exchange group after a deployment, and it gives auditors the source address, SNI, port, scanner version, and policy state needed to reproduce the result.
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