Identity and Access Management (IAM)
What Is Identity and Access Management?
Identity and Access Management (IAM) is the framework of policies, technologies, and processes that ensures the right individuals have access to the right resources at the right times, for the right reasons, and that access is consistently enforced, audited, and revoked when no longer needed. It governs how users, devices, and applications authenticate to systems and what they are authorised to do once authenticated.
In an era where identity has become the primary attack surface, IAM is not an IT administration function; it is a core security discipline. The majority of successful cyberattacks involve compromised credentials or exploited access privileges, making robust IAM directly relevant to breach prevention.
Core Functions of IAM
Identity Lifecycle Management
Creating, modifying, and deprovisioning user identities as employees join, change roles, and leave the organisation. Accounts that are not properly deprovisioned become orphaned access risks that attackers actively seek out.
Authentication
Verifying that a user is who they claim to be. Multi-factor authentication (MFA) significantly raises the bar for credential-based attacks by requiring a second verification factor that a stolen password alone cannot satisfy.
Authorisation and Access Control
Determining what an authenticated user is permitted to do. Role-Based Access Control (RBAC) assigns permissions based on job function; Attribute-Based Access Control (ABAC) applies additional contextual conditions. The principle of least privilege dictates that users receive only the access necessary for their current role.
Access Governance and Auditing
Periodic access reviews that verify users still need the access they have, audit logs that record who accessed what and when, and compliance reporting that demonstrates access controls to regulators and auditors.
IAM in Cloud and Hybrid Environments
Cloud adoption has expanded IAM scope beyond on-premises Active Directory to encompass cloud platforms, SaaS applications, and API access. Modern IAM solutions provide unified identity governance across all environments, enabling consistent least-privilege enforcement regardless of where a resource is hosted.
Key Takeaways
- IAM ensures the right users have the right access to the right resources at the right time, with consistent enforcement and auditing.
- Core functions include identity lifecycle management, authentication, authorization, and access governance.
- MFA is among the most effective controls for preventing credential-based attacks.
- The principle of least privilege, granting only the minimum access necessary, reduces the blast radius of any compromised account.
- Modern IAM must span on-premises, cloud, and SaaS environments through unified governance frameworks.