Long-lived certificates and embedded secrets create risk because they are difficult to find, update, and retire at scale. If an organisation cannot rotate or replace them cleanly, post-quantum migration becomes a slow, high-friction programme that extends exposure and increases the chance of missed dependencies.
Why This Matters for Security Teams
Long-lived certificates and embedded secrets are not just hygiene issues. They become a post-quantum cryptography (PQC) problem because every static credential is a dependency that must be discovered, inventoried, rotated, and retired before cryptographic migration can be trusted. If secrets are embedded in code, images, pipelines, or device firmware, they are often far harder to replace than the encryption algorithms themselves. The result is migration drag, hidden trust paths, and a wider blast radius if legacy cryptography is later weakened.
Security teams usually underestimate how much secret sprawl turns a crypto programme into an operational cleanup effort. NHIMG’s Guide to the Secret Sprawl Challenge shows why unmanaged secrets persist across CI/CD, collaboration tools, and cloud workloads, while the OWASP Non-Human Identity Top 10 frames exposed credentials as a core identity risk, not just a storage issue. In practice, many security teams discover the hardest-to-replace certificates only after a migration deadline has already forced emergency exceptions.
How It Works in Practice
PQC migration does not begin with swapping one algorithm for another. It begins with finding every place a certificate, token, API key, or private key is trusted. Long-lived secrets are risky because they create persistent trust relationships that survive code changes, team changes, and platform changes. If a certificate is baked into an application image or a secret is embedded in a script, the system may continue to run for months or years without any practical way to replace it safely.
The operational answer is to shorten trust windows and reduce secret permanence. That usually means:
- Replacing embedded secrets with centrally managed, runtime-fetched credentials.
- Using short-lived certificates or tokens with automated renewal and revocation.
- Tracking certificate ownership, usage, expiry, and dependency chains before migration.
- Prioritising high-value systems where compromise or delayed rotation would be most damaging.
Current guidance suggests that PQC readiness is inseparable from secrets governance. NIST’s Cybersecurity Framework 2.0 emphasises asset visibility, risk management, and recovery planning, which map directly to certificate inventory and lifecycle control. NHIMG’s Ultimate Guide to NHIs — Static vs Dynamic Secrets is useful here because it shows why dynamic secrets reduce the long-tail exposure that makes crypto transition slow and brittle. The Akeyless survey found that only 44% of organisations are using a dedicated secrets management system, which helps explain why so many environments still rely on embedded credentials and manual cleanup. These controls tend to break down when certificates are hardcoded into legacy appliances or firmware because replacement requires coordinated vendor, application, and operations change windows.
Common Variations and Edge Cases
Tighter secret rotation often increases operational overhead, so organisations have to balance migration speed against service stability. That tradeoff is especially sharp in legacy systems, industrial environments, and third-party integrations where certificate replacement can require downtime or vendor support.
Some edge cases need special handling. Device certificates may be long-lived by design, but they still need an inventory and renewal path. Offline systems may not support dynamic secret retrieval, so compensating controls such as hardware security modules, constrained trust anchors, or staged replacement programmes become necessary. There is no universal standard for PQC transition sequencing yet, but best practice is evolving toward prioritising the most exposed and most persistent credentials first.
For practitioners, the real issue is not whether a certificate uses a legacy or post-quantum algorithm today. It is whether the organisation can reliably find, replace, and revoke every instance of that trust relationship without breaking production. NHIMG’s The State of Secrets Sprawl 2025 illustrates how frequently secrets remain scattered across code and collaboration systems, which is exactly why crypto agility fails in the field. When embedded secrets live inside devices, container images, or vendor-managed software, migration slows because the dependency cannot be changed at the same pace as the cryptography.
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 | Long-lived secrets and certificates are classic non-human identity lifecycle risk. |
| NIST CSF 2.0 | PR.AA-01 | Identity and credential management underpins trust path reduction for PQC readiness. |
| NIST AI RMF | AI RMF helps when agentic systems rely on embedded secrets and long-lived trust. |
Inventory NHI credentials, shorten TTLs, and automate rotation before PQC migration starts.
