A Survey on Multi-Keyword Ranked Query Search over Encrypted Cloud Storage

Advancement in cloud computing have revamped the view of modern information technology which is motivating the data owners to outsource their data to the public cloud server like Amazon, Microsoft Azure, Google Drive, etc. With the help of data outsourcing, the organizations can provide reliable data services to their users without any concerns for the data management overhead. One more advantage of outsourcing the data over cloud as SAAS (Storage as a Service) is its cost-effectiveness, scalable and it can be accessed from anywhere and anytime. Normally, CSPs (Cloud Service Providers) take care of the data and its privacy, but there are some of the factors because of which the data privacy and user identity may be violated like an apostate employee, etc. Therefore, data owners should encrypt their respective sensitive data before outsourcing it to the public cloud server. Because the data is getting encrypted before outsourcing which may affect the performance of some important data accessing operations like searching of a document, etc. As we know CSPs plays a vital role for data privacy, but is it sufficient for the sensitive data like account figures, budgeting data, photos, health care files, etc So, to answer the question, there are some methods/solutions offered to provide security and privacy to the data over cloud server. In the survey few of the searching techniques have been studied to find an effective method/solution for the retrieval of data/files over the encrypted cloud data.