Efficiently Managing Encrypted Data in Cloud Databases

Cloud computing has brought many advantages to organizations and computer users. It allows different service providers to distribute many applications as services in an economical way. Therefore, many users and companies have begun using cloud computing. However, they are concerned about their data when they store it on a third party server, the cloud. The private data of individual users and companies is stored and managed by the service providers on the cloud, which offers services on the other side of the Internet in terms of its users, and consequently results in privacy concerns [1]. In this paper, a technique has been explored to encrypt the data on the cloud and to execute and run SQL queries on the cloud over encrypted data. The strategy is to process the query at the service providers´ site without having to decrypt the data. Also, to achieve efficiency, no more than the exact set of requested data is returned to the client. Data decryption is performed at the client site to prevent any leakage at the cloud or during transmission. Two techniques have been provided to effectively store the encrypted data. Also, an experiment evaluation has been provided to compare between the two techniques.