Abstract: The blind storage is to preserve the outsourced data in cloud through gateway encryption and to implement multi-keyword ranked search over the encrypted data in a secure way by NLP process without downloading and decrypting the entire group member file contents. The access rights of the user are specified by the data owner in order to keep track of the files which are uploaded. The blind storage helps the data owner to save the data securely and it is not known to the server or user until they get the index file. Ranked search over the files help the server to retrieve what the file needed by the search user.

Keywords: Cloud Computing, Multi-keyword search, Blind Storage, Access Control.