Cloud computing is providing resources advent over a network which is benefiting almost all IT services. With software as a service and storage as service more and more enterprise applications are shifting towards Cloud platform making Smartphones their thin Clients and thus promoting Mobile Cloud Computing. Mobile cloud computing is a computing of data and storage of data outside the mobile device. The data storage and data processing happens on the cloud not on the mobile device. Thus mobile cloud computing provides the use of technology smartly and reserving the scarce resources of mobile. But as more and more sensitive information is passing the Mobile phones, the need of securing the information and creating a trust between the Mobile user and the Storage Cloud is emerging. This leads to the area to be focused that is security of mobile data, offloading to cloud for storage and processing. There are many encryption techniques used by researchers such as RSA, DES and AES for security purpose. These techniques have some loopholes. So, we are proposing a framework which will use ECC technique with progressive encryption to provide better security to the mobile data on cloud without creating much overhead on the Smartphone.