Data leakage preventation using homomorphic encryptionin cloud computing

The cloud computing environment enables cloud users to outsource their data into the cloud environment because of its cost efficiency and ease of management. However, by out sourcing the data to the cloud, cloud users lose their control over the data. This situation becomes more critical when using a cell phone and initiating the handoff process. There is a problem when cloud users invalidate some of the data access rights. An existing solution to this problem is symmetric key encryption method. However, this is not secure when a rejected cloud user rejoins the system to capture the confidential data of handoff mobile devices that is much easier to intercept for adversary. In this paper, an efficient and secure data sharing framework has been introduced using homomorphic encryption and proxy re-encryption methods, which prevent data leakage of mobile cloud users when initiating the handoff process. Our proposed method is validated using a JAVA platform and obtained results confirm the suitability of our proposed method.