When should organisations treat API keys and tokens as NHI assets?

When API Keys and Tokens Cross into NHI Territory

api key and tokens become NHI assets when they are the mechanism a system uses to prove itself to another system. If the credential can log in, request data, call functions, or assume access without a person present, it is not just a secret string. It is part of the identity layer, with ownership, expiry, rotation, and access scope to manage.

That distinction matters because the practical risk changes once the credential represents an autonomous access path rather than a human convenience. At that point, the main questions are not “who knows the value?” but “what can this credential do, where is it trusted, and how far does compromise travel?”

What Makes the Asset an Identity, Not Just a Secret?

The deciding factor is function. A copied token sitting in a password manager may be sensitive, but a token that authenticates a service, workload, app, or integration is carrying identity and privilege. The same token may also be used for delegated access, machine-to-machine calls, or cross-product SaaS automation, which means it has a lifecycle independent of any human user.

That lifecycle usually includes issuance, distribution, storage, scope, rotation, revocation, and offboarding. Once those steps exist, the asset has governance obligations that mirror other non-human identities. The Ultimate Guide to NHIs is useful here because it frames the broader identity, lifecycle, and governance context that turns credentials into managed assets rather than ad hoc secrets.

Practically, organisations should treat the asset as NHI when compromise or misuse would create durable access, not just a one-time leak. A short-lived bearer token may still be sensitive, but a long-lived API key, refresh token, or client credential that can be reused across environments has an identity footprint that needs inventory and accountability.

How to Govern API Keys and Tokens Once They Are NHI Assets

The governance model should shift from “store the secret safely” to “control the identity behind the secret.” That means assigning an owner, scoping the credential to the smallest workable access path, and defining a revocation path that does not depend on someone remembering where the token was copied. It also means treating cross-environment use, shared credentials, and hardcoded distribution as warning signs.

At minimum, the organisation should be able to answer who issued the credential, what system it authenticates, what it can reach, when it expires, and how it will be removed when the application or integration changes. If that answer is unclear, the asset is already functioning like an unmanaged NHI. NHI Ownership and Accountability Guide and Guide to NHI Rotation Challenges both reinforce that ownership and rotation are not administrative extras, they are core controls for machine-facing access.

For OAuth-based integrations and SaaS connections, the same logic applies to consent, scopes, and token revocation. A token that can be replayed or reused outside its intended audience is an identity asset with material blast radius, even if no user ever directly handles it. SaaS-to-SaaS and OAuth App Governance Guide is a strong companion when the asset is really an integration identity expressed through tokens.

Risk and Threat Considerations

API keys and tokens become dangerous when teams treat them as static configuration instead of active identity material. Stolen or over-scoped credentials can enable silent access, lateral movement, or unauthorised API use long after the original issue was deployed, especially when the token is long-lived or reusable across environments.

Failure mechanism: The credential is issued broadly, stored poorly, copied into code or logs, or left active after the integration changes. An attacker or unauthorised party then reuses the token to authenticate as the service, often without triggering normal user-centric controls.

Impact: Compromise can expose data, trigger unauthorised actions, or let an attacker pivot through trusted integrations. The practical blast radius is determined by scope, expiry, revocation speed, and whether the organisation can detect non-human use patterns quickly enough.

Practitioner Guidance

What to verify: Confirm whether the credential can authenticate a non-human actor, whether it is tied to a named owner, and whether revocation is operationally tested. If any of those answers are missing, treat the credential as unmanaged identity material rather than a simple secret.

Decision rule: If a token can call production systems, access customer data, or drive automation without a person present, place it under identity governance, not only secret storage. If it is single-use, tightly scoped, and cannot independently establish access, it may remain primarily a secret-management concern.

Practitioner takeaway: The moment a key or token can act on its own, the control problem changes from protecting a value to governing an identity. That is the point where ownership, scope, rotation, and offboarding become mandatory, not optional.

Related resources from NHI Mgmt Group

• Why do valid API keys and OAuth tokens still create lateral movement risk?
• What breaks when a platform stores customer OAuth tokens and API keys without governance?
• How should teams govern API keys and tokens across hybrid cloud platforms?
• How can organisations reduce the risk of stale API keys and machine tokens?