Security SLAs for multi-cloud applications: the MUSA SLA Composition approach

Cloud security is still considered one of the main inhibitors for the adoption of cloud-based solutions in many environments. The perception of lack of security is given by the loss of control that a cloud service customer (CSC) has over the cloud services: What exactly are the security measures adopted by the cloud service provider (CSP)? How to verify the effective enforcement of the security policies declared by CSPs?