A non-human identity (NHI) is a digital identity used by applications, services, scripts, bots, workloads, and AI agents to authenticate and access systems. It usually proves its identity through secrets such as API keys, OAuth tokens, passwords, SSH keys, or digital certificates.
Understanding and managing these identities is increasingly important as cloud services, DevOps automation, and AI expand the number of NHIs across corporate environments. In some organizations, NHIs outnumber human identities by as much as 50 to 1.
Types of non-human identities
Types of non-human identities differ in how they authenticate and what tasks they perform:
- Service accounts allow operating systems, applications, databases, and background services to perform automated tasks or communicate with other resources.
- API keys, tokens, certificates, and cryptographic keys authenticate non-human identities and enable secure programmatic or machine-to-machine access. Common examples include API keys, access tokens, OAuth tokens, TLS/SSL certificates, and SSH keys used by applications, services, virtual machines, containers, devices, and other infrastructure.
- Cloud workload identities and IAM roles provide applications, containers, serverless functions, and other workloads with permissions to access cloud resources.
- CI/CD, automation, and RPA identities support deployment pipelines, scheduled scripts, infrastructure-as-code tools, and robotic process automation bots.
- AI agent identities enable autonomous or semi-autonomous agents to call tools, retrieve data, interact with applications, and complete tasks on behalf of users or systems.
Although all these identities are non-human, they typically have access to production data, customer records, or critical infrastructure, posing unique security risks.
Why NHIs pose security risks
Non-human identities introduce security challenges because they are often privileged and poorly governed compared to human accounts. In many organizations, NHIs are created for specific projects, integrations, or automation tasks and then retain access with static credentials and broad permissions.
Common non-human identity risks
Service and application accounts may receive broader permissions than their tasks require. If attackers compromise one of these accounts, they can use its legitimate permissions to access your sensitive data and critical systems.
Static secrets and credential sprawl
API keys, tokens, and passwords may be hardcoded in source code, copied between tools, stored in unprotected files, or left unchanged for long periods.
Limited visibility and unclear ownership
Organizations may lack a centralized inventory, making it difficult to determine who owns an identity, why it exists, what it can access, and whether it is still needed.
Credentials and accounts can remain active long after an application, integration, employee, or vendor no longer needs access, leaving blind spots in your environment.
Security tools designed for user behavior monitoring may overlook machine activity or fail to distinguish legitimate automation from suspicious use.
Lateral movement and privilege escalation
Once attackers compromise a single over‑privileged NHI, they can move laterally across systems, escalate privileges, and exfiltrate your sensitive data.
Because non-human identities operate quietly in the background, you may not spot a compromise for a long time.
Non-human identity security best practices
A strong non-human identity security program should combine identity discovery, access governance, credential protection, lifecycle management, and continuous monitoring.
ILM best practices
1
Discover and inventory every NHI
2
Enforce least privilege and just-in-time access
3
Vault and rotate secrets
4
Assign ownership and manage the full lifecycle
5
Continuously monitor NHI behavior
1. Discover and inventory every NHI
Identify all service accounts, application accounts, workload identities, keys, tokens, certificates, scripts, and bots across your on-premises systems, cloud platforms, SaaS applications, and CI/CD environments.
Record each identity’s purpose, permissions, dependencies, authentication method, and owner. A complete inventory helps you identify unmanaged or unnecessary identities before attackers exploit them.
2. Enforce least privilege and just-in-time access
Give each NHI only the permissions required for its specific function. Remove unnecessary access to achieve zero standing privileges and, where technically possible, use the just-in-time access principle. These approaches limit how long elevated access remains available and reduce the potential damage caused by compromised credentials.
3. Vault and rotate secrets
Store passwords, keys, tokens, and other sensitive credentials in an encrypted vault rather than hardcoding them in scripts or application code.
Automate credential rotation, use short-lived secrets where possible, and revoke exposed or unused credentials immediately. Regular rotation reduces the period during which a stolen secret remains useful to an attacker.
4. Assign ownership and manage the full lifecycle
Designate a human owner for every non-human identity. The owner should be responsible for reviewing its permissions, credential security, business purpose, dependencies, and continued necessity.
Establish identity lifecycle management procedures covering secure provisioning, access reviews, permission changes, credential rotation, and offboarding. When an application, integration, workload, or automation process is no longer needed, its accounts and credentials should be revoked immediately.
5. Continuously monitor NHI behavior
Track authentication events, access requests, privilege changes, resource usage, and unusual activity to identify and mitigate threats early. For example, if a backup service suddenly accesses customer records or an API token is connecting from an unusual location, these deviations may indicate malicious activity and should trigger immediate investigation and response.
Syteca is aprivileged access management (PAM) platform with identity threat detection and response (ITDR) capabilities that can help you secure a subset of NHIs, particularly service and application accounts. Syteca enables you to discover privileged and service accounts, securely vault and rotate their credentials, enforce least privilege, record sessions, send alerts with real-time response, and more.
Want to try Syteca? Request access
to the online demo!
See why clients from 70+ countries already use Syteca.
FAQ
Not exactly. In cybersecurity, the NHI meaning is broader than machine identity: a non-human identity is any digital identity used by an application, service, workload, device, automation, or AI agent. Machine identities are a subset of NHIs and generally refer to identities used by physical or virtual machines, devices, containers, and workloads, often authenticated through certificates or cryptographic keys.
A database service account is one of the most common examples. An application can use this account and its stored credentials to connect to a database, read or update approved records, and complete automated tasks.
Other examples include a CI/CD pipeline token, a cloud workload role, an API key used by an integration, or an AI agent identity that allows the agent to use approved business tools.