A survey on multi-keyword ranked search manipulations over encrypted cloud data

Nowadays, the advancements and the fame of cloud computing are increasing which is actuating the data owners to keep their personal and professional data on public cloud servers like Google, Apple, Yahoo, Amazon, Microsoft etc with the help of data outsourcing the organizations can provide reliable and efficient services to their users. The other advantage of outsourcing the data over cloud servers is for high benefit and lesser cost in managing the data and the data can be accessed from anywhere and at anytime. However, for privacy concerns, the data that are highly sensitive should be encrypted before outsourcing. Taking into consideration the huge amount of data users and files that are present in the cloud, it is important that multiple keywords should be allowed in the searching request and retrieve the files relevant to those keywords. There are some methods and solutions offered to provide privacy and security for the data over the cloud server. In this survey, several searching techniques have been studied for the efficient retrieval of data or files or documents over the encrypted data.