A Survey on Searchable Symmetric Encryption and Approach for Multi-Keyword Search Over Encrypted Data on Cloud Server

Now a days, cloud computing has evolved as an important paradigm for IT industry with reduced cost, pay as you use, scalability, easy accessibility and improved flexibility. In a cloud environment client data can reside in any corner of the world as maintained and controlled outside their reach. So, there can be security and privacy issue with the client data. To ensure the privacy of data over cloud it is good to outsource the data in a encrypted format. Encryption of data works quite pretty good with single data owner. But single owner scheme restrict the scalability of system which is not useful. So multiple data owners can outsources and access the data securely with encryption. While retrieving such encrypted data searchable symmetric Encryption technique is used which will be reviewed deeply in this paper. To increase usability of system, it is good to allow multi-keyword query search which leads to accuracy in result and ranked search result gives systematic view to the fetched result over encrypted data. Note that, retrieving the data privacy preservation is main issue. To achieve this some novel protocols are discussed in this survey paper.