Certificate authorities and workload identity: are your controls keeping up?

TL;DR: Certificate authorities do more than issue TLS certificates: they verify identity, anchor trust stores, and increasingly sit inside machine identity and certificate lifecycle workflows, according to DigiCert. For IAM and NHI teams, the control problem is no longer issuance alone but continuous validation, renewal, and trust governance across devices, APIs, and cloud services.

NHIMG editorial — based on content published by DigiCert: What's a certificate authority? A beginner's guide to CAs

Questions worth separating out

Q: How should security teams govern certificate authorities in a machine identity programme?

A: Treat certificate authorities as part of the identity control plane, not as a one-time procurement choice.

Q: Why do certificates create operational risk even when encryption is in place?

A: Encryption protects data in transit, but it does not guarantee that the endpoint is trusted, owned, or still valid.

Q: What breaks when certificate inventory is incomplete?

A: Incomplete inventory breaks ownership, renewal planning, and revocation response.

Practitioner guidance

• Map every certificate to an owner and service Build a certificate inventory that ties each certificate to a business service, technical owner, and renewal path.
• Automate renewal before expiry becomes outage risk Prioritise automatic renewal for high-volume and customer-facing certificates, then add alerts for certificates that cannot be automated.
• Align validation level to transaction sensitivity Use stronger validation for services that handle sensitive data or high-trust interactions, and do not rely on domain validation alone for critical business-facing services.

What's in the full article

DigiCert's full blog post covers the operational detail this post intentionally leaves for the source:

• Validation workflow details for DV, OV, and EV certificate issuance across different trust scenarios
• Certificate deployment patterns for single-domain, wildcard, and multi-domain use cases
• Operational guidance on certificate lifecycle management, including renewal and expiration handling
• Trust-store and browser distrust implications for continuity planning and remediation

👉 Read DigiCert's guide to certificate authorities and certificate trust →

Certificate authorities and workload identity: are your controls keeping up?

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