Modern systems rely heavily on non-human identities—API tokens, service accounts, bots, and more. While they simplify operations, they also create significant security challenges. Ensuring these identities operate securely is no longer an option; it's a necessity. This is where step-up authentication for non-human identities comes into play as a robust security solution.
Most software engineers and managers are familiar with step-up authentication for humans. But when applied to non-human identities, there are unique considerations and opportunities. This post takes a technical deep dive into how non-human identities step-up authentication works, and why it’s critical for securing today’s microservices, APIs, and cloud environments.
What Is Step-Up Authentication for Non-Human Identities?
Step-up authentication for non-human identities is a security mechanism that dynamically increases the authentication requirements based on risk. Non-human identities typically authenticate with static secrets or certificates. However, these can be compromised, leading to unauthorized access.
Step-up authentication adds extra verification steps only when a predefined condition or behavior triggers it. For example, if a bot or API access request exhibits irregular geography, performs actions outside its normal scope, or suddenly escalates permissions, the system might enforce an additional layer of security, such as requiring a time-based one-time password (TOTP) or signing requests in real-time with a hardware security module (HSM).
Why It Matters: Non-Human Roles Are Under Attack
Non-human identities routinely have access to sensitive data and perform critical operations. This makes them prime targets for attackers. An exposed API key or an insecure service account could provide malicious actors direct access to your internal systems.
Consider these growing risks:
- Credential leaks: Frequent exposure of service account secrets through repository misconfigs or logging errors.
- Excessive permissions: Service accounts often unintentionally hold more privileges than needed due to mismanagement.
- Behavior anomalies: A compromised bot connection might suddenly start exfiltrating large datasets that go unnoticed.
Step-up authentication dynamically secures these identities based on real-time analysis, reducing risks without overburdening the system with heavy authentication flows during normal operation.