NHI vs. machine identity, the vocabulary argument.

The short answer

Machine identity and non-human identity refer to overlapping but not identical concepts. "Machine identity" historically centres on cryptographic identity primitives, certificates, keys, machine-bound credentials, and is the framing used by Venafi (now CyberArk), Gartner's "Machine Identity Management" category, and most PKI-anchored vendors. "Non-human identity" is the broader umbrella that also includes service accounts, OAuth tokens, SaaS-to-SaaS connections, and AI agents, identity constructs that are not naturally machine-bound.

Both frames are useful. The industry will probably continue to use both indefinitely. Our editorial convention on this site is to use NHI as the umbrella and treat machine identity as a specific subset.

"Machine identity", the origins

"Machine identity" as a named category traces most directly to Venafi, which built its business around certificate and key management in the 2010s, and to Gartner, which formalised "Machine Identity Management" as a market category with annual Hype Cycle coverage from around 2018 onwards. The framing has two characteristics:

• The identity-bearing unit is a machine, a server, a container, a device, a workload.
• The identity is carried by a cryptographic primitive, typically a certificate or a key.

This framing is coherent and has a long history. It matches cleanly to PKI, to mTLS, to code signing, and to most device-authentication contexts. It also matches cleanly to the CyberArk portfolio post-Venafi acquisition ($1.54B, 2024), and by extension to the Palo Alto Networks portfolio post-CyberArk acquisition ($25B, closed February 2026).

"Non-human identity", the origins

"Non-human identity" as a named category traces primarily to the cloud-native and SaaS-heavy landscape of the early 2020s, where a new category of identities, OAuth tokens, SaaS integration users, personal access tokens, cloud IAM roles, became too numerous and too risky to handle with existing IAM or PKI frameworks. Lalit Choda's Non-Human Identity Management Group (NHIMG), founded in 2023, was an early organising force. Astrix Security, Oasis Security, Entro, Token, and others built businesses around the framing.

In 2025, the OWASP Foundation formalised the term by publishing the OWASP Non-Human Identities Top 10, a dedicated working group's risk taxonomy, which cemented "non-human identity" as the framing most of the vendor-neutral community now uses.

The NHI framing is broader than machine identity. An OAuth refresh token held by a third-party SaaS is non-human, but it is not naturally "machine-bound" in the Venafi sense. A service account in Active Directory is non-human, but it is identified by a password, not by a certificate. An AI agent is non-human, but it has no physical machine binding at all, it is a logical construct.

Where the two terms overlap

Most serious NHI and machine-identity vendors now cover an overlapping scope. The overlap includes:

• Cloud IAM identities (AWS roles, Azure service principals), these are NHIs and have machine-identity aspects
• Kubernetes service accounts and their associated workload identity federation
• Mutual-TLS certificates for service-to-service authentication
• SSH keys and other long-lived cryptographic credentials
• Container-mounted credentials in Kubernetes and similar orchestrators

In practice, both NHI-framing and machine-identity-framing vendors compete for these use cases. Which term they prefer reflects their origin story, not a principled scope difference.

Where the two terms actually differ

The differences show up at the edges.

The pattern: the further from cryptographic primitives you move, into OAuth, SaaS integrations, AI agents, the more "non-human identity" fits and "machine identity" strains. The further into cryptographic primitives and device-bound authentication you go, the more "machine identity" fits.

Which vendors use which term

• "Machine identity" primary: CyberArk (post-Venafi), Keyfactor, DigiCert, AppViewX, Sectigo, Entrust.
• "Non-human identity" primary: Astrix Security, Oasis Security, Entro Security, Token Security, Aembit, Clutch Security, Silverfort (post-Rezonate), GitGuardian.
• Both/either: HashiCorp Vault (IBM), SailPoint (especially post-Agent Identity Security 2025), Okta, Microsoft Entra.

Gartner's nomenclature has evolved toward "Machine Identity Management" (MIM) for the overall market category, with a separate tracking of "Non-Human Identity Management" (NHIM) for the newer, SaaS-and-OAuth-heavy subcategory. Forrester and IDC have been more inclined to use "non-human identity" as the umbrella. This is still shifting, expect both terms to appear in analyst reports for at least the next two to three years.

Our position

We use "non-human identity" as the umbrella term on this site for three reasons:

1. Broader coverage. NHI includes OAuth tokens, SaaS integrations, and AI agents cleanly; machine identity has to stretch to cover them.
2. Industry momentum. OWASP, CSA, NHIMG, IETF WIMSE work, and most newer specialised vendors have converged on NHI.
3. Fewer semantic weirdnesses. Calling an OAuth refresh token a "machine identity" strains the category; calling it a non-human identity is natural.

We treat machine identity as the specific sub-domain of NHI concerned with cryptographic primitives, certificates, keys, PKI-anchored identity. It is a useful and coherent subset. When we cover certificate lifecycle, PKI, or related topics, we often use "machine identity" as the precise term for that subset.

If your organisation uses "machine identity" throughout, we are happy with that, the practical content about controls, lifecycle, and risk is the same either way. Pick the framing that fits your stakeholders' vocabulary and do not spend political capital on the nomenclature.

Frequently asked questions

What is the difference between NHI and human identity management?

Human identity management is anchored to a person with an HR record, a manager, a joining and leaving date, and the ability to complete an interactive authentication challenge. Non-human identity management has none of those. The identity is created by an engineer to solve an immediate problem, has no automatic retirement trigger, authenticates with a key or token rather than a password and second factor, and exists at a scale where per-identity human review is not viable.

Is non-human identity the same as machine identity?

They overlap substantially but the emphasis differs by lineage. Machine identity is the term preferred by Gartner and the certificate-lifecycle vendors, centring on cryptographic credentials such as certificates and keys. Non-human identity is the umbrella preferred by OWASP and the newer specialised vendors, covering service accounts, API keys, OAuth tokens, workload identities and AI agents as well. We use NHI as the umbrella and treat machine identity as a major subset.

What is a non-person entity?

Non-person entity, or NPE, is the term used in United States federal and defence identity contexts for what the commercial sector calls a non-human identity: devices, services and applications that hold credentials and are issued certificates under a PKI. If you are reading government identity guidance the concepts map closely even though the vocabulary differs.

What is NHI reuse and why does it matter?

NHI reuse is the practice of using a single non-human identity across multiple applications, environments or teams, usually because creating a new one was slower than borrowing an existing one. It matters because it destroys three things at once: attribution, because logs cannot tell you which consumer acted; least privilege, because the identity accumulates the union of every consumer's needs; and revocability, because nobody can safely rotate a credential whose consumers are unknown. It is one of the most common findings in a first assessment and one of the hardest to unwind.

Which term should we use internally, NHI or machine identity?

Whichever your existing tooling and vendors use, so long as the scope is written down. The practical risk is not choosing wrongly but choosing implicitly: teams that say machine identity often scope to certificates and keys, and leave OAuth grants, SaaS integrations and agent credentials outside the programme. Define the categories in scope explicitly and the label matters much less.