A digital identity assigned to a non-human entity such as a software application, service account, API key, bot, machine, or AI agent that enables it to authenticate and interact with systems without direct human involvement. NHIs now outnumber human identities in most enterprises by 25 to 50 times.
Expanded Definition
Non-Human Identity, or NHI, is the identity layer used by software entities that must authenticate, authorize, and act inside digital systems without a person at the keyboard. That includes service accounts, API keys, workload identities, bots, and increasingly autonomous NIST Cybersecurity Framework 2.0-aligned workloads and AI agents. The term is widely used in NHI security, but usage in the industry is still evolving because some vendors bundle NHIs into broader machine identity or secrets management narratives.
The practical distinction is that an NHI is not just a credential, and it is not just a workload. It is the combination of identity, privilege, authentication method, and lifecycle governance that lets the entity operate safely across systems. NHI management therefore covers issuance, rotation, revocation, access scoping, monitoring, and offboarding. NHI Management Group’s Ultimate Guide to NHIs treats that full lifecycle as the baseline for governance, not an optional add-on.
The most common misapplication is treating an API key or certificate as the identity itself, which occurs when teams secure the secret but ignore the account, permissions, and system-level behavior behind it.
Examples and Use Cases
Implementing NHI governance rigorously often introduces inventory and rotation overhead, requiring organisations to weigh tighter control and faster incident containment against operational friction for development and platform teams.
- A CI/CD pipeline uses a service account to deploy containers into production, with access limited to a narrow RBAC scope and rotated on a scheduled basis.
- An AI agent calls internal tools through an identity that is governed with JIT access and ZSP principles, rather than inheriting broad standing privileges.
- An integration partner authenticates with an API key, but the key is mapped to a dedicated NHI profile so access can be reviewed, logged, and revoked independently.
- A secrets platform stores certificates for a workload identity, while the owning team uses Top 10 NHI Issues to benchmark common failure modes such as duplication, stale access, and poor offboarding.
- A cloud workload federation design follows identity boundaries that align with NIST Cybersecurity Framework 2.0 outcomes for access control and monitoring.
Examples such as the Cisco DevHub NHI breach show how a single exposed identity can become a broader control failure when the surrounding lifecycle is weak.
Why It Matters in NHI Security
NHI risk becomes urgent because NHIs often outnumber humans by orders of magnitude, and their privileges are frequently broader than operators realise. In NHI Mgmt Group research, 97% of NHIs carry excessive privileges, which increases unauthorized access and expands the attack surface. That finding matters because NHI compromise is rarely a single-secret problem; it is usually a governance problem that includes overreach, duplication, stale credentials, and weak ownership.
Misunderstanding NHI also leads to false confidence. Teams may believe a vault, scanner, or PAM product has solved the issue, when in reality the identity still has standing access or remains active after offboarding. The 52 NHI Breaches Analysis and the Ultimate Guide to NHIs — What are Non-Human Identities both reinforce the same operational reality: visibility, ownership, and revocation speed matter more than credential storage alone.
The most relevant control lesson is that NHI governance must be built into Zero Trust and access review workflows, not bolted on after a leak or compromise. Organisations typically encounter NHI as an emergency after secrets exposure, failed offboarding, or lateral movement, at which point the identity becomes operationally unavoidable to address.
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 Zero Trust (SP 800-207) and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Covers secret handling and lifecycle weaknesses common in NHI deployments. |
| NIST Zero Trust (SP 800-207) | section 2.3 | Zero Trust requires strong workload identity and least-privilege enforcement for NHIs. |
| NIST CSF 2.0 | PR.AC-4 | Access permissions management maps directly to least-privilege control for non-human identities. |
Inventory NHIs, tie each secret to an owner, and rotate or revoke credentials on a defined schedule.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on May 16, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
