TLS certificates are machine identities because they prove identity for workloads, services, and devices just as credentials do for people. They need inventory, ownership, renewal, and revocation controls, which are core NHI governance functions. Separating certificates from the NHI programme leaves a major identity class outside oversight.
Why TLS certificates sit inside NHI governance
TLS certificates are not just encryption artefacts. They are machine identities that prove a workload, service, device, or intermediary is allowed to connect. That makes them part of the same governance problem as any other non-human identity: who owns them, where they are issued, how long they live, what they can authenticate, and how quickly they are revoked when trust changes.
Security teams often separate certificate management from identity governance because certificates feel infrastructure-centric, but that split creates blind spots. A certificate can expose a privileged service just as easily as an API key can, and the operational failure modes are similar: expired credentials, weak ownership, uncontrolled issuance, and delayed revocation. The Top 10 NHI Issues guidance reflects the broader pattern that unmanaged machine credentials become security debt quickly, while the NIST Cybersecurity Framework 2.0 reinforces that identity, access, and recovery need coordinated control rather than separate silos.
In practice, many security teams only discover certificate governance gaps after an outage, a failed renewal, or an emergency rotation rather than through intentional identity oversight.
How certificates should be managed in practice
Good nhi governance treats certificates as inventory-managed, policy-bound, and revocable identities. That means every certificate should have a clear owner, purpose, issuance source, expiration date, and dependency mapping to the workload or service it protects. It also means renewal cannot be treated as a purely operational task, because renewal changes trust boundaries if the certificate is used for mutual TLS, service-to-service authentication, or device attestation.
Practically, teams should link certificate issuance to identity lifecycle controls already used for other NHIs. The same discipline described in the Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs applies here: onboard, approve, monitor, rotate, and revoke. Certificates should also be visible alongside other secrets, not hidden in separate tooling. That matters because certificate sprawl often travels with service accounts, workloads, and automation systems that are difficult to see in aggregate. NHI programmes that map these dependencies can reduce surprise failures and make renewal windows predictable.
- Maintain a certificate inventory with owner, subject, issuer, usage, and expiry fields.
- Set renewal and revocation rules based on business criticality, not just technical expiry.
- Tie certificate issuance to approval workflows and workload identity where possible.
- Monitor for shadow issuance, duplicate certificates, and certificates tied to retired services.
This is especially important because NHI compromise is common enough to be a governance issue, not a niche technical one. Oasis Security & ESG reported that 72% of organisations have experienced or suspect a breach of non-human identities in The 2024 ESG Report: Managing Non-Human Identities, which is why certificate oversight belongs in the same control plane as the rest of NHI inventory and access review. These controls tend to break down when certificates are embedded in legacy applications with no owner and no automated renewal path because revocation and replacement become manual emergency work.
Where the edge cases and tradeoffs appear
Tighter certificate governance often increases operational overhead, requiring organisations to balance faster change velocity against stronger identity assurance. That tradeoff is real in environments with service meshes, ephemeral workloads, and hybrid infrastructure, where certificates may be short-lived and replaced frequently. Current guidance suggests this should push teams toward automation, not toward looser controls, but there is no universal standard for every renewal model yet.
One common edge case is ephemeral infrastructure. If workloads are created and destroyed rapidly, certificate handling needs to align with workload identity and automated issuance rather than static registries. Another edge case is third-party integration, where external platforms may present certificates but ownership and revocation are controlled elsewhere. In those scenarios, governance should extend to the dependency chain, not just the local certificate store. The Ultimate Guide to NHIs and the 52 NHI Breaches Analysis both underline the same practical point: hidden machine credentials become incident drivers when nobody can answer who issued them, why they exist, or how they are retired. For certificate-heavy estates, governance succeeds only when identity, operations, and security teams share the same lifecycle view.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | Covers NHI credential rotation and lifecycle control for machine identities. |
| NIST CSF 2.0 | PR.AC-4 | Access control applies to certificate-backed service and device identities. |
| NIST AI RMF | AI risk governance helps when certificates support autonomous or AI-driven workloads. |
Inventory certificates as NHIs and automate rotation, renewal, and revocation under one lifecycle process.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on May 30, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
