Securing Machine Identities: A Step-by-Step Approach to Non-Human Identity Management

Introduction

With the explosion of AI workloads, APIs, and automated processes, non-human identities (NHIs)—such as service accounts, bots, and machine-to-machine credentials—now outnumber human identities in many organizations. These identities often lack proper governance, creating significant security blind spots. Recognizing this challenge, Cisco recently moved to acquire Astrix Security, a leader in non-human identity protection, to strengthen its identity-centric security portfolio. This guide walks you through a practical, step-by-step process to tackle NHI risks in your own environment, drawing on best practices that align with industry-leading approaches like those being integrated into Cisco's security ecosystem.

What You Need

• Inventory tools: A discovery platform (e.g., cloud asset management, directory services) to list all authenticated entities.
• Identity governance software: Solutions capable of managing both human and non-human identities (e.g., Azure AD, Okta, or dedicated NHI solutions like Astrix).
• Access to source code repositories and CI/CD pipelines: To find embedded secrets and tokens.
• Security information and event management (SIEM) or user and entity behavior analytics (UEBA) tools: For monitoring aberrant access patterns.
• Cross-functional collaboration: Buy‑in from DevOps, security, and IAM teams.
• Policy templates: Predefined rules for least privilege and credential rotation.

Step 1: Map Your Current Non-Human Identity Landscape

Begin by identifying every non-human identity across your infrastructure. Use automated scanners to discover service accounts, API keys, OAuth tokens, machine certificates, and secrets in code repositories. Catalog each identity’s purpose, owner, and access privileges. Document where credentials are stored (e.g., vaults, environment variables, hard‑coded files). This baseline is essential because you cannot protect what you do not see.

Step 2: Centralize Identity Governance

Bring all NHIs under a unified identity governance framework. Integrate your directory services (Active Directory, cloud identity providers) with a solution that treats non-human identities as first‑class citizens. Implement role‑based access control (RBAC) or attribute‑based access control (ABAC) specifically for machine identities. Assign clear ownership to each identity—just as you do for human employees. This centralization mirrors Cisco’s strategy of embedding NHI management into its broader identity security platform.

Step 3: Automate Lifecycle Management

Manual management of NHIs is unsustainable at scale. Automate provisioning, credential rotation, and decommissioning. For example, use secrets management tools (e.g., HashiCorp Vault, AWS Secrets Manager) to enforce regular key rotation without human intervention. Set expiration dates for temporary tokens and automate re‑certification every 90 days. Remove unused identities promptly to reduce the attack surface. Automation is the cornerstone of a mature NHI program.

Step 4: Enforce Least-Privilege Access

Review each NHI’s permissions and trim them to the minimum necessary. Remove inherited or excessive rights. For machine accounts, restrict lateral movement by limiting which resources they can access. Implement just‑in‑time (JIT) access for sensitive operations, granting permissions only when needed and revoking them automatically. This step directly reduces the blast radius of any compromised non-human identity.

Step 5: Monitor for Anomalous Behavior

Deploy behavioral analytics tuned to NHI patterns. Flag deviations such as a service account accessing resources outside its normal time window, a sudden spike in API calls, or an OAuth token being used from an unfamiliar IP. Integrate these alerts into your SIEM and orchestrate automated responses (e.g., revoke tokens, disable accounts). The Astrix acquisition brings sophisticated AI‑driven anomaly detection to this layer.

Step 6: Integrate NHI Security into Your Zero‑Trust Architecture

Non-human identities must be treated with the same zero‑trust rigor as human users. Require continuous authentication for every API call and machine‑to‑machine request. Enforce policy checks at every access attempt, regardless of source. Use technologies like mutual TLS (mTLS) and short‑lived certificates to strengthen machine identity verification. Cisco’s identity‑first approach aims to weave NHI protection into every security policy.

Step 7: Continuously Improve and Audit

NHI environments evolve rapidly. Schedule regular audits of your identity inventory, permissions, and compliance. Track metrics such as the number of orphaned identities, average credential age, and time to detect anomalies. Use findings to refine policies and automation rules. Stay informed about emerging threats targeting machine identities (e.g., OAuth token theft, AI‑driven attacks). Continuous improvement ensures your program adapts to new risks.

Tips for Success

• Start small, scale fast: Pilot your NHI program in a non‑critical environment before rolling out enterprise‑wide.
• Leverage vendor expertise: Solutions like Astrix (now part of Cisco’s portfolio) offer purpose‑built tools that can accelerate your maturity.
• Educate developers: Many NHI risks originate from hard‑coded secrets. Train your engineering teams on secure credential handling.
• Adopt a zero‑trust mindset: Never trust any machine identity implicitly—always verify, even inside your network.
• Document everything: Maintain a living repository of NHI owners, purposes, and lifecycle policies for auditing and incident response.
• Monitor emerging standards: Keep an eye on industry frameworks like OAuth 2.0 Rich Authorization Requests (RAR) and OIDC for machine‑to‑machine flows.

By following these steps, your organization can close the NHI security gap, reduce the risk of credential‑based breaches, and align with the most advanced identity‑centric security strategies in the industry.