Cloud Security Fundamentals

Chapter 5Identity and Access Management (IAM) in the Cloud

Effective identity and access management (IAM) is a foundational requirement for securing cloud infrastructure, safeguarding data, and enabling scalable operational governance. As traditional perimeter-based defenses diminish in relevance, identity becomes the new control plane, responsible for authorizing every interaction in a distributed environment. Mismanagement of identity—whether through excessive permissions, misconfigurations, or unmanaged sprawl—remains one of the leading causes of cloud breaches. Building a resilient IAM architecture is therefore critical not only for enforcing least privilege but for maintaining visibility, accountability, and compliance across dynamic workloads and diverse user populations.

Identity as the Security Perimeter

In cloud-native environments, identity has become the new boundary of trust, effectively supplanting the traditional network perimeter that once defined the edge of enterprise infrastructure. Instead of relying on fixed firewalls and static IP ranges to protect assets, cloud platforms enforce access control through identity-driven models. Every user, device, service, and workload is instantiated as a discrete identity within the cloud’s control fabric. This means that identity no longer merely enables access—it is the access. The security model now depends fundamentally on the integrity, governance, and observability of these digital identities.

Each identity in ...