In the modern era, data security becomes the major issue as million or trillion of data in units is being generated to cloud with every moment of time. Here the main role of cloud is to provide virtual storage for storing information or we can say it works as transmission medium for wireless data communication. So, it is very important to choose our cloud platform wisely as data is never secured while it is over cloud or in transmission medium. So, study is helping to understand the impact of data security over cloud platform, and we are reviewing the existing techniques that have been implemented by other researchers to provide encrypted communication when cloud is intermediate between sender and receiver.