Overview: Cloud Access Security Broker (CASB)

Quick Definition

A Cloud Access Security Broker (CASB) is a security tool that sits between an organization's on-premises infrastructure and cloud service providers to monitor and control cloud usage. CASBs serve as gatekeepers that enforce security policies, provide visibility into cloud applications, and protect sensitive data as it moves to and from cloud services.

CASBs typically offer four main pillars of functionality: visibility into cloud usage across the organization, compliance monitoring to ensure regulatory requirements are met, data security through encryption and access controls, and threat protection against malicious activities. They can be deployed as on-premises appliances, cloud-based services, or hybrid solutions.

These tools are particularly valuable for organizations adopting cloud services while maintaining strict security requirements. CASBs help identify shadow IT usage, where employees use unauthorized cloud applications, and can enforce data loss prevention policies across multiple cloud platforms. They also provide detailed analytics and reporting on cloud usage patterns, helping security teams understand potential risks and compliance gaps in their cloud environment.