Abstract: Mobile devices namely smart phones and tablets play a significant role in life of a common man and thus they become a necessary tool in providing various services from different applications. But these devices are more limited with respect to desktop computers in terms of on-board memory, processors, and available network bandwidth. Offloading data to the high storage cloud servers invariably improves performance of mobile systems but technical challenges do remain. Moreover, the cloud based data is constantly being accessed by the mobile devices that are resource constrained for which the cost of processing must be minimised. Thus in this paper we propose a technique using attribute and re-encryption based key management with Manager as a trusted entity independent of CSP(Cloud Service Provider) in order to overcome the privacy issues.