Technology evolution is addressing the industry to face some formidable challenges, such as ensuring the security of mobile devices. By the union between Cloud technologies and mobile devices, the new concept of "Mobile Cloud Computing" (MCC) has emerged. MCC technologies enable users to quickly collect and integrate data from heterogeneous sources, regardless of where they reside. However, although they are constantly evolving and spreading, these technologies still maintain security and privacy issues that have not found definite answers. In this paper we propose a mobile secure storage approach which is primarily oriented to guarantee confidentiality and integrity issues concerning data stored on mobile smart devices that are part of a multi-Cloud environment. To this end, we introduce and discuss the "ARIANNA" app. ARIANNA consists of an Android app that represents the software enabler which allows us to extend our experimental multi-Cloud system towards the mobile world. Moreover, in order to evaluate our proposal, we conducted several experiments taking into consideration the mobile application in real and dynamic multi-Cloud environment scenarios.
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