What counts as a non-human identity
Non-human identity is the umbrella term for every identity that does not belong to a person: service accounts running applications, API keys and OAuth tokens connecting services, cloud workload identities, CI/CD pipeline credentials, RPA bots, and increasingly AI agents acting on systems autonomously.
The term overlaps heavily with machine identity, and the two are often used interchangeably. Where a distinction is drawn, machine identity emphasizes the credentials of devices and workloads — certificates and keys — while NHI is the broader governance framing that also covers software actors like bots, integrations, and AI agents.
What unites the category is behavior: NHIs authenticate without a person present, operate around the clock, and hold standing permissions that no manager sees in a daily workflow.
Why NHIs are a growing risk
NHIs typically outnumber employees many times over, yet receive a fraction of the security attention. They rarely have MFA, their credentials are often long-lived and shared between environments, and they frequently hold broad permissions granted once and never revisited. When an integration is retired, its credentials tend to live on.
Several prominent breaches in recent years began with a compromised NHI — a leaked token, an over-privileged OAuth integration, or a forgotten service account — precisely because these identities offer persistence without triggering the alerts tuned for human behavior.
Auditors and frameworks are catching up: access reviews, least privilege, and lifecycle requirements that once applied only to user accounts are increasingly expected to cover service accounts and integrations too, and the rise of autonomous AI agents is accelerating that scrutiny.
Governing NHIs in practice
Governance starts with discovery and ownership: build an inventory of service accounts, keys, tokens, and integrations, and require a named human owner for each. An NHI without an owner cannot be reviewed, renewed, or safely retired.
Then apply the same discipline used for people, adapted to machines: least-privilege scoping instead of broad admin roles, scheduled credential rotation or short-lived credentials instead of permanent secrets, lifecycle rules that expire an NHI when its owning application is decommissioned, and inclusion in periodic access reviews. Monitoring should flag anomalies such as an NHI suddenly accessing new resources or authenticating from unexpected places.
Identity platforms are extending in this direction, and platforms like Monosign can bring service accounts under the same directory, policy, and review framework as human identities.