UMCloud: A user-oriented security scheme for mobile cloud storage

In order to avoid data loss when user´s mobile device is stolen or lost, users are encouraged to use mobile cloud storage to transfer and store the data from mobile terminals to the cloud as a means of data backup. Although various encryption mechanisms have been proposed to protect the security in cloud side by cloud service providers, the traditional cloud systems still cannot persuade the users that the data are securely protected if the secure mechanisms are not implemented by the user side. To prevent cloud service providers from leaking personal information, a security scheme implemented in the client side for mobile cloud storage with the name of UMCloud is proposed. The proposed scheme adopts a comprehensive mixture cryptosystem to provide protection of confidentiality and integrity for the storage of data in the cloud while supporting the sharing of the encrypted data among authorized users.