What Is a non-human identity (NHI)?

Definition#

A non-human identity (NHI) is a digital identity used by a machine, application, service, workload, device, or automated process to authenticate and access resources. Examples include service accounts, API keys, cloud workload identities, certificates, bots, and machine-to-machine credentials.

The distinction matters because enterprise environments depend on automated access, while traditional identity programs often focus primarily on employees and other human users.

An NHI is closely related to a machine identity, although the terms can have different scopes depending on the organization. In practice, both refer to identities that allow systems, software, or devices to authenticate and act.

How it works#

An NHI typically has three components:

1. An identifier that distinguishes the machine or workload, such as a service account name, client ID, certificate subject, or cloud role.
2. An authenticator that proves control of the identity, such as a password, API key, private key, certificate, token, or federated credential.
3. An authorization policy that determines what the identity can access and what actions it can perform.

For example, a payment-processing service may use a workload identity to read transaction data from a database and write results to a message queue. The service authenticates using a short-lived token issued by an identity provider. Authorization policies then restrict the service to the required database and queue operations.

The security lifecycle resembles the lifecycle for human identities, but the operating details differ:

• Create: An application, platform, or administrator provisions the identity.
• Assign ownership: A team or system owner becomes accountable for its use and permissions.
• Authenticate: The workload presents a secret, certificate, token, or federated identity.
• Authorize: An access control system evaluates its permissions.
• Monitor: Logs and telemetry record authentication attempts and activity.
• Rotate: Credentials or keys are replaced before they become stale or exposed.
• Revoke: Access is removed when the workload, integration, or identity is no longer needed.

NHIs are difficult to govern when no individual owner is clearly associated with them. Cloud platforms, CI/CD pipelines, infrastructure-as-code tools, SaaS integrations, containers, and scripts can create them automatically. Credentials may also be copied into configuration files, environment variables, source repositories, images, or ticket attachments.

A mature NHI program needs more than a list of accounts. Each identity should be linked to its owner, purpose, environment, authentication method, permissions, dependencies, and last observed use.

Technical Notes: Basic discovery

Discovery should combine identity-provider data, cloud configuration, platform inventories, source-code scanning, and access logs. Kubernetes administrators can begin by reviewing service accounts:

kubectl get serviceaccounts --all-namespaces
kubectl get rolebindings,clusterrolebindings --all-namespaces

A simple inventory record might include:

name: payments-worker
type: workload-identity
owner: payments-platform
environment: production
auth_method: short-lived-token
last_seen: "2026-09-28T14:22:00Z"
permissions:
  - read: transactions
  - write: settlement-events
review_status: approved

This is not a complete control. Teams should also identify unused identities, broad permissions, long-lived credentials, shared accounts, credentials without owners, and identities active in sensitive environments.

When you’ll encounter it#

You will encounter NHIs across nearly every modern enterprise environment:

• Cloud platforms: Roles, managed identities, instance profiles, functions, and workload federation allow compute resources to access cloud services.
• Containers and orchestration: Kubernetes service accounts and pod identities let workloads call APIs or retrieve secrets.
• CI/CD pipelines: Build runners and deployment jobs need access to source code, artifact repositories, infrastructure, and production systems.
• Databases and messaging: Applications use service accounts or certificates to connect to databases, queues, caches, and event streams.
• SaaS integrations: Connectors synchronize data between customer relationship management, finance, support, collaboration, and security platforms.
• Developer tooling: Scripts, automation accounts, bots, and infrastructure-as-code tools use tokens or keys to perform repeatable tasks.
• Network and security devices: Firewalls, proxies, scanners, monitoring systems, and backup platforms authenticate to exchange data or run administrative actions.
• Operational technology and IoT: Devices and controllers may use certificates, keys, or device identities to connect to management platforms.
• AI and data workloads: Model-serving systems, agents, notebooks, and data pipelines require controlled access to data and internal APIs.

The immediate risk is not that an identity is non-human. It is unmanaged access. A leaked API key may provide direct access without a normal interactive login. A stale service account may retain privileges after an application is retired. Shared credentials can make accountability and incident investigation difficult. An overprivileged workload may turn a compromise in one application into access to unrelated systems.

Analyst’s Take: Start with inventory and ownership before trying to refine every access policy. Without knowing which identities exist, who is accountable for them, and where they are used, teams cannot reliably identify stale credentials or excessive permissions. Production, sensitive-data, administrative, external-integration, and high-impact automation identities deserve the earliest review.

Security teams should prioritize NHIs connected to production, sensitive data, administrative functions, external integrations, and high-impact automation. Useful controls include:

• Maintain a centralized inventory with an accountable owner.
• Prefer short-lived, workload-bound credentials over static secrets.
• Store secrets in an approved secrets-management system, not source code or images.
• Apply least privilege and separate read, write, and administrative permissions.
• Rotate keys and certificates according to risk and operational need.
• Alert on unusual locations, workloads, times, or resource access.
• Review dormant and high-privilege identities regularly.
• Revoke access as part of application and integration retirement.

For human-accessible secrets used to administer NHI systems, teams may also use a dedicated password and secrets-management platform such as Try 1Password →. It should complement—not replace—workload identity controls, automated rotation, and machine-focused access policies.

NHI security risks#

NHI security programs commonly encounter five recurring risks:

1. Unknown identities: Accounts, keys, certificates, or tokens exist outside the central inventory.
2. Unclear ownership: No team or individual is responsible for reviewing access or responding to compromise.
3. Excessive privilege: A workload can access more systems or data than its function requires.
4. Credential exposure: Secrets appear in repositories, logs, images, environment variables, or tickets.
5. Incomplete retirement: Identities remain active after an application, integration, device, or pipeline is decommissioned.

These risks can combine. For example, an exposed API key belonging to an unowned service account may remain valid for months and provide broad access to production systems. Monitoring may detect suspicious use, but responders can struggle to determine whether the activity is legitimate or who should approve revocation.

Effective controls should therefore connect discovery, ownership, authentication, authorization, monitoring, rotation, and deprovisioning. A control that only detects secrets after they are exposed is less effective than a lifecycle process that prevents long-lived, unowned credentials from being created in the first place.

Related terms

• Machine identity: A broad term for the identity of a device, system, application, or workload. It can include both the identifier and its cryptographic credentials.
• Workload identity: An identity assigned to software running in a cloud, container, virtual machine, serverless function, or other execution environment.
• Service account: An account used by an application, service, or automation process rather than a person. It may be local to a platform or managed by a central identity system.
• API key: A credential used by an application or client to authenticate to an API. API keys can be difficult to scope and rotate if they are static or widely distributed.
• Application identity: An identity representing a software application when it requests access to another system.
• Device identity: An identity assigned to a physical or virtual device, commonly used for enrollment, authentication, management, or secure communication.
• Secrets management: The practice of storing, distributing, rotating, and revoking sensitive credentials such as keys, passwords, and tokens.
• Privileged identity management: Controls for governing elevated access, including approval, time limits, monitoring, and review.
• Identity governance: The broader discipline of managing identity lifecycle, ownership, access policy, certification, and compliance.
• Zero trust: A security approach that evaluates access based on identity, context, policy, and continuous verification rather than network location alone.

For more context on adjacent security concepts, see the software bill of materials FAQ. An SBOM does not replace NHI inventory, but it can help teams understand the software components and dependencies associated with applications that use machine identities.

Final takeaway#

For enterprise security teams, the practical definition is straightforward: an NHI is any identity that lets something other than a person authenticate and act.

Begin by building a governed inventory with an accountable owner. Then use it to find excessive permissions, stale credentials, exposed secrets, and access that should be revoked as workloads and integrations change. Strong NHI security treats every machine identity as a lifecycle-managed asset rather than an automatically trusted technical detail.

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