Human and Non-Human Identities

What Human and Non-Human Identities Cover

Human and non-human identities are the digital subjects that request and consume access in modern environments. The distinction matters because people, service accounts, API keys, certificates, bots, and AI agents do not share the same ownership model, authentication method, or lifecycle.

For security teams, this term is not just about naming account types. It describes the full set of identities that can be granted authority, including identities that act continuously, run unattended, or operate across systems and clouds. That makes the category broad enough to include both workforce access and machine-to-machine access without collapsing them into one control model.

Why the Difference Matters in IAM

Human identities are usually tied to a person, a joiner-mover-leaver process, and accountability expectations such as approvals, reviews, and offboarding. Non-human identities often need different treatment because they are embedded in applications, integrations, pipelines, or infrastructure and may outlive the people who created them.

That difference affects how organisations design access governance. A password policy that works for staff may be unsuitable for a service account; similarly, a certificate or token can authenticate a machine even though no person is involved. The operational question is not whether the identity is “real”, but whether it can be uniquely governed, authenticated, authorised, and retired when its purpose ends. NHIMG’s Human vs Non-Human Identity explains the boundary where people and machine access overlap, while What are Non-Human Identities gives the underlying NHI taxonomy.

Common Identity Forms Across People and Machines

This term includes employee and contractor accounts, but it also extends to service accounts, application identities, workload identities, API keys, certificates, bots, and AI agents. Those forms are often overlooked because they may not look like traditional users, yet they still represent authority and can be misused if left unmanaged.

In practice, the main control challenge is that each identity type has a different trust boundary. A person can be challenged with interactive authentication and reviewed by a manager or owner. A machine identity may need federation, certificates, scoped tokens, or managed secrets instead. NHIMG’s Service Account Security Guide is useful for the machine side of that boundary, and the NHI Authentication Guide covers how those identities prove themselves in real environments.

Governance, Lifecycle, and Trust Boundaries

The practical meaning of the term is that governance cannot stop at human accounts. Organisations need to know who owns each identity, how it is authenticated, what it can do, where it is used, and how it is deprovisioned. Without that, orphaned service accounts, stale tokens, and overprivileged automations become hidden trust paths.

That is why this concept sits at the intersection of identity governance and operational security. A mature programme treats humans and non-humans as separate but connected populations, with different lifecycle events, different review cadences, and different failure modes. Joiner-Mover-Leaver is the right mental model for people, while the NHI Ownership and Accountability Guide explains why machine identities still need explicit ownership and retirement discipline.

Risk and Threat Considerations

Human and non-human identities create risk when organisations govern them as if they were interchangeable. The usual failure pattern is inconsistent visibility, weak ownership, and credentials or secrets that remain active after the original purpose has changed. That expands the blast radius of compromise and makes lateral movement easier once an identity is abused.

Failure mechanism: An identity is created for a task, then forgotten, reused, or granted broader access than it needs, which leaves a standing path for misuse, theft, or persistence.

Impact: Attackers can use the forgotten or overprivileged identity to access systems, impersonate services, move laterally, or exfiltrate data without needing to compromise a primary user account.

Practitioner Guidance

Why practitioners should care: The term should be used as a governance boundary, not just a naming convention. Teams need separate expectations for interactive human access and non-interactive machine access, because the wrong control model creates both operational friction and security gaps.

Practitioner note: When a programme says it manages “identities” but only inventories users, it is missing a large part of the attack surface. A practical inventory should include the account, the secret or credential that enables it, the owner, the scope of use, and the retirement path.

Related resources from NHI Mgmt Group

• When do non-human identities pose the greatest risk to organizations?
• What is the first step in managing non-human identities at scale?
• How should security teams govern non-human identities at scale?
• How should security teams govern non-human identities for compliance?