Topic starter
24/06/2026 9:23 pm
TL;DR: Non-human identities now outnumber human users in many environments, making authentication and authorization gaps more consequential for zero trust access control, identity lifecycle management, and least privilege, according to Entro Security. The central issue is not whether authn and authz exist, but whether they are still fit for machine identities whose permissions, tokens, and certificates change faster than human review cycles.
Editorial analysis by NHI Mgmt Group, based on content published by Entro Security: “Authentication vs Authorization: Zero trust in the age of non human identities”.
Key questions
Q: What breaks when a non-human identity authenticates successfully but keeps overly broad permissions?
A: Authentication still works, but the security model fails at the authorization layer.
Q: Why do overly broad machine permissions create more risk than weak authentication alone?
A: Because authentication only proves who or what the identity is, while authorization controls what it can do next.
Q: How do security teams know if NHI authorization is actually working?
A: Look for consistent allow and deny decisions at runtime, complete audit logs for each request, and fewer services that need code-level permission checks.
Practitioner guidance
- Separate credential governance from entitlement governance Track certificate, token, API key, and OAuth lifecycle on one workstream, then review the permissions attached to each NHI on a different cadence.
- Inventory machine identities by real function Map service accounts, bots, devices, and workloads to the specific resource actions they need, then flag any identity whose permissions cannot be tied to an active workload.
- Reduce standing permissions on authenticated machines Replace broad default entitlements with narrowly scoped RBAC or ABAC policies so that a valid NHI credential does not imply wide application access.
Bottom line: Non-human identities create a control problem that starts at authentication but is decided by authorization scope and lifecycle discipline.
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25/06/2026 6:35 am
Authentication and authorization are no longer separable governance problems in NHI programmes: the first proves a machine is real, but the second determines whether that machine can do damage. In modern cloud estates, a valid certificate or token can be technically sound while the accompanying entitlements are still far too broad. Practitioners should treat the two controls as different failure domains, not as interchangeable steps in one access flow.
A few things that frame the scale:
- NHIs outnumber human identities by 25x to 50x in modern enterprises, according to the Ultimate Guide to NHIs.
A question worth separating out:
Q: Why do machine identities force IAM teams to change review processes?
A: Machine identities change the pace of governance because they can be created, used, and abandoned faster than periodic access reviews can respond. IAM teams need live entitlement signals, not only certifications, because service accounts and AI-connected access can outlive the business event that created them. That makes continuous control more useful than retrospective approval.
👉 Read our full editorial: Authentication vs authorization in NHI governance and zero trust