User data on mobile devices are always transferred into Cloud for flexible and location-independent access to services and resources. The issues of data security and privacy data have been often reverted to contractual partners and trusted third parties. As a matter of fact, to project data, data encryption and user authentication are fundamental requirements between the mobile devices and the Cloud before a data transfer. However, due to limited resources of the smartphones and the unawareness of security from users, data encryption has been the last priority in mobile devices, and the authentication between two entities always depends on a trusted third party. In this paper, we propose a lightweight encryption algorithm and a security handshaking protocol for use specifically between in mobile devices and in Cloud, with the intent of securing data on the user side before it is migrated to cloud storages. The proposed cryptographic scheme and security protocol make use of unique device specific identifiers and user supplied credentials. It aims to achieve a usersoriented approach for Smartphone Cloud. Through experiments, we demonstrated that the proposed cryptographic scheme requires less power consumption on mobile devices.

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