The question at hand
Your organization relies on thousands of API keys, service accounts, OAuth tokens, and machine credentials. Every CI/CD pipeline, microservice, and monitoring agent needs credentials to function. The question isn't whether to secure these non-human identities (NHIs). It's whether you should apply the same identity governance you use for employees or create a different system.
Security teams are divided. Some believe your existing IAM controls are sufficient if extended to NHIs. Others argue that machine identities operate at a scale and speed that traditional identity management can't handle. Both perspectives come from real operational experience.
Extending Employee IAM
The "treat them the same" camp argues that you already have identity governance in place. You've built role-based access controls, conduct access reviews, and maintain audit trails. Why start from scratch?
Your RBAC system defines what a deployment service account can access. Quarterly access reviews catch orphaned credentials. Your SIEM correlates authentication events, whether from a person or a pipeline. Adding NHIs to this framework means one governance model, one audit process, and one set of controls for ISO 27001 Annex A.9.2 (user access management).
This approach simplifies reporting. When auditors ask "how do you manage privileged access?", you show them one system. Your access request workflow handles both the engineer needing production database access and the monitoring agent needing read permissions. Your privileged access management tool rotates credentials for both humans and services.
Operationally, your security team already knows this system. You don't need to train them on a separate NHI platform or maintain two different policy sets. The cognitive load remains manageable.
Purpose-Built NHI Management
The "build something different" camp argues that scale changes everything. You might have 500 employees but 50,000 service accounts. Employee credentials change when roles change or someone leaves, maybe a few times a week. NHI credentials should rotate daily or even hourly. These are different challenges.
Consider your CI/CD pipeline. It creates ephemeral credentials for every build, potentially hundreds per day. Your employee IAM system wasn't designed for credentials that last 15 minutes. It expects long-lived identities with stable permissions. Forcing short-lived machine credentials into a human-centric system leads to brittle automation or overly broad permissions just to keep things running.
Visibility becomes a problem at scale. Employee access reviews work because managers know their team members. Who reviews the 3,000 Kubernetes service accounts in your production cluster? Often, it's "nobody" or "the platform team does it once a year and approves everything because they don't understand what half of them do."
Purpose-built NHI tools operate at machine speed. They discover credentials automatically, map them to workloads, detect anomalous usage patterns, and rotate them without human intervention. They're designed for the reality that you can't manually review 50,000 identities quarterly.
Where Practitioners Land
In practice, most security teams use a hybrid approach. They extend their IAM for long-lived service accounts that behave like employees: the main database service account, the primary monitoring credential, the backup service. These change infrequently enough for quarterly reviews to make sense.
For everything else, they build or buy automation. Kubernetes secrets are managed by external secrets operators. CI/CD credentials come from workload identity federation. Cloud service accounts use short-lived tokens from instance metadata services.
The dividing line isn't "human versus machine." It's "can this be reviewed manually or does it need automation?" If your security team can understand an identity and review its permissions quarterly, extend your IAM. If the identity exists for minutes, is created programmatically, or you have thousands of them, automate it.
This hybrid approach is evident in how teams implement NIST CSF v2.0 PR.AC-1 (identities and credentials are issued, managed, verified, revoked). They use existing IAM for the "issued and revoked" part when it's manual and purpose-built tools for the "managed and verified" part when continuous management is needed.
Our Take
Start with your employee IAM, but recognize its limits. If you're granting service accounts 90-day credential lifetimes because rotation breaks your deployment process, you've hit the limit. If your access reviews skip entire categories of credentials because nobody understands them, you've hit the limit. If you're discovering credentials in production that never went through your provisioning workflow, you've definitely hit the limit.
The right answer depends on what you're managing. A service account for your payroll system? Treat it like an employee. The 500 credentials your microservices use to call each other? You need automation.
Don't wait until you have 50,000 NHIs to build automation. The teams struggling most are those who extended their employee IAM to 10,000 service accounts and now can't migrate without breaking everything. Start automating high-velocity, short-lived credentials now, even if you only have a few hundred. Your future security team will thank you when you're not trying to manually review 5,000 API keys during your next SOC 2 Type II audit.
