In which cloud deployment model does platform security come under enterprise responsibility?

In the Infrastructure as a Service (IaaS) deployment model, platform security indeed falls under enterprise responsibility. This is because IaaS provides users with the fundamental components of computing resources such as servers, storage, and networking, all configured and managed via a cloud provider. In this setup, while the cloud provider secures the underlying infrastructure, the enterprise has the responsibility for securing everything above that layer, including the operating system, applications, and data.

This delineation is critical in IaaS because it offers greater control to the enterprise over its computing environment, allowing the organization to implement specific security measures tailored to its needs. As a result, security responsibilities need to be clearly defined, and organizations must take proactive steps to protect their cloud resources.

Other models such as Platform as a Service (PaaS) and Software as a Service (SaaS) shift more of the security responsibilities onto the provider. In PaaS, the provider manages not just the infrastructure but also the platforms that allow for the development of applications, which limits the enterprise's responsibilities primarily to the applications themselves. In SaaS, users interact with fully managed applications and thus have even less security responsibility, focusing mainly on user data and access control.

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