Integrity checking Over Encrypted Cloud Data

Cloud providers provide various promising services to users and this makes the cloud to be very popular among users. Cloud computing is a location independent computing wherein files are outsourced as a service. Users outsource their data to the third party cloud server to reduce various costs such as storage, management etc. The outsourced data may have sensitive and valuable information that needs to be secured. In order to assure confidentiality, users encrypt their data before outsourcing it to the cloud server. But the searching and retrieval of encrypted files becomes too complex. The existing works on searchable encryption focus on Single keyword search, Multi-keyword search, Boolean keyword search and rarely vary the search results. In Multi-Keyword Ranked Search Over Encrypted Cloud Data (MRSE), ranked searchable symmetric encryption scheme is used for efficient retrieval of similar data from the cloud server based on the ranking. Even though the ranking scheme provides most similar files from the cloud server, one cannot assure whether the retrieved files are having same fields are not. In this paper for the first time, ranking fixed by the cloud server is being tested to check the correctness of its order. Rank test method is used to check the integrity of the rank order over the search results. Since the rank fixed by cloud server is checked, the user can get accurate results and so privacy can be improved.