What type of security model is implemented by public clouds?

The security model implemented by public clouds is best described as shared. In a shared security model, the responsibility for security is distributed between the cloud service provider and the customer. The provider ensures the security of the cloud infrastructure itself, while customers are responsible for securing their data, applications, and access. This model allows the cloud provider to manage and safeguard physical hardware, networks, and virtualization layers, while clients must implement security measures pertaining to their own environments, such as data encryption, access controls, and compliance with relevant regulations.

The shared responsibility model is crucial for public clouds as it defines the mutual obligations of both the provider and the customer, fostering a collaborative approach to security in a multitenant environment. This approach acknowledges that multiple customers share the same infrastructure, and it emphasizes the need for customers to actively participate in protecting their own resources and data within that shared space.