Efficient verification of data encryption on cloud servers

Leak of clients´ sensitive information from cloud system remains to be a problem despite of rapid development of cloud technology. One of the major reasons for such leaks to occur is the lack of efficient encryption verification schemes. For a cloud computing system, computational strength of server should not be sacrificed while encryption and verification is applied, which adds certain level of difficulty in developing an efficient verification scheme. We present in this paper an efficient incentive-triggered method to verify the data encryption on server side. Compared with previous solutions, our method is considerably faster. Besides the efficiency, our method can be applied to both archive data and frequently-modified data. The above are major features that make our scheme to be more practical and applicable than previous solutions.