Overview: Shared Responsibility Model

Quick Definition

A Shared Responsibility Model is a framework that divides cybersecurity responsibilities between cloud service providers and their customers. Under this model, cloud providers typically secure the underlying infrastructure, physical facilities, and foundational services, while customers remain responsible for securing their data, applications, operating systems, and user access management.

The specific division of responsibilities varies depending on the service model. In Infrastructure as a Service (IaaS), customers bear greater responsibility for security configurations, including virtual machines, networks, and operating systems. With Platform as a Service (PaaS), the provider handles more of the underlying security, while customers focus on application-level security and data protection. In Software as a Service (SaaS), the provider manages most security aspects, leaving customers primarily responsible for user management, access controls, and data classification.

Understanding this model is crucial for organizations moving to cloud environments, as misunderstanding responsibility boundaries can lead to significant security gaps. Common misconceptions include assuming cloud providers handle all security aspects or that moving to the cloud eliminates the customer's security obligations entirely. Effective cloud security requires clear communication between providers and customers about their respective roles and continuous monitoring to ensure both parties fulfill their security responsibilities appropriately.