A non-human credential is a secret used by software, automation, or an AI agent to authenticate or act on a system’s behalf. Examples include API keys, tokens, certificates, and service account secrets. These credentials need lifecycle governance because they often persist beyond the human task that created them.
Expanded Definition
A non-human credential is any authenticator that allows software to prove identity and obtain access without a person present at the keyboard. In NHI security, this includes API keys, bearer tokens, client certificates, service account secrets, and short-lived credentials issued to workloads or agents. The key distinction is not the format of the secret, but the fact that the credential is bound to machine execution and often survives beyond the task that created it.
Usage in the industry is still evolving because some teams treat all machine credentials as interchangeable, while others separate long-lived secrets from ephemeral credentials and federated identities. That distinction matters: a static secret stored in code or a pipeline has a very different risk profile from a scoped, time-bound token governed by policy. The OWASP Non-Human Identity Top 10 frames this problem as an identity lifecycle and exposure issue, not just a password management issue.
NHI Management Group has documented how secret sprawl and insecure sharing practices remain common, including in the Guide to the Secret Sprawl Challenge and the Ultimate Guide to NHIs – Static vs Dynamic Secrets. The most common misapplication is treating a non-human credential as a reusable implementation detail, which occurs when teams embed secrets in code, configs, or tickets instead of governing issuance, scope, and rotation.
Examples and Use Cases
Implementing non-human credentials rigorously often introduces operational friction, requiring organisations to weigh developer velocity against stronger scoping, rotation, and revocation controls.
- A CI/CD pipeline uses a short-lived token to pull artifacts from a registry, with access bound to the job and automatically revoked after completion.
- An AI agent calls internal tools through a delegated credential that is limited to a narrow set of actions, reducing blast radius if the agent is abused.
- A backend service authenticates to a database with a client certificate managed through a central lifecycle system instead of a hardcoded password.
- A cloud workload uses federated identity rather than a long-lived API key, aligning with the guidance in NIST SP 800-63 Digital Identity Guidelines.
- A repository scan finds a secret committed to source control, leading to emergency rotation and a post-incident review informed by the CI/CD pipeline exploitation case study.
These patterns also appear in breach research such as the Reviewdog GitHub Action supply chain attack, where exposed automation credentials became an attacker entry point. In practice, the term covers both the credential itself and the controls around how it is issued, stored, discovered, and retired.
Why It Matters in NHI Security
Non-human credentials are often the shortest path from a minor exposure to a material compromise because they grant direct machine-to-machine access, usually with no phishing prompt, no user challenge, and no human approval step. When these credentials are overprivileged, copied across environments, or left active after the workload changes, they become durable attack paths that scale faster than human account abuse.
The operational risk is not theoretical. NHIMG research shows that 23.7% of organisations still share secrets through insecure methods such as email or messaging applications, while 88.5% acknowledge that non-human IAM practices lag behind or merely match human IAM maturity. Those gaps make non-human credentials a governance issue as much as a technical one. The 2024 Non-Human Identity Security Report also highlights how strongly organisations want dynamic ephemeral credentials, which reflects the pressure to reduce long-lived secret exposure.
Event-driven abuse can happen quickly once a credential escapes. NHIMG research in LLMjacking: How Attackers Hijack AI Using Compromised NHIs shows attackers attempt access to exposed AWS credentials within minutes. Organisations typically encounter the consequence only after logs, billing anomalies, or unexpected tool activity reveal misuse, at which point non-human credential governance becomes operationally unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST SP 800-63 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Directly addresses secret sprawl and lifecycle control for machine credentials. |
| NIST SP 800-63 | AAL2 | Guides assurance expectations for credential strength and authentication protection. |
| NIST CSF 2.0 | PR.AC-1 | Supports access control management for identities, including non-human identities. |
Match workload credential assurance to risk and avoid weak reusable secrets where stronger proof is possible.
