Table 1 Research questions and their motivation

RQ1- What cloud security requirements have been addressed in recent publications (2011-2014)?

The aim is to find out what all aspects of cloud security have been researched and what all are not being researched.

RQ2- What solutions are offered to them?

The aim is to know the way/ framework through which any specific security issue has been resolved its current status.

RQ3- When did research on cloud migration become active in computing community and how it is reported?

The goal is to understand the existing gaps in cloud security framework and cloud migration process

RQ4- What are the obstacles in the cloud migration process and how it is being researched?

The objective is to probe the actual reasons for organizations not adopting cloud and the way it has been dealt in the research work.