The increasing number of smartphone users will encourage competition among smartphone manufacturers in innovating and marketing their products. Such competition can create open space for attackers to understand how smartphones work and then spread threats through malicious programs. In this study, a brief review of various threats and mitigations is carried out on smartphones infrastructure, especially on several well-known brand smartphones.

The development and growth of data is rapidly increasing and it triggers development on storage technology namely cloud storage. In this research, implementation of Lashkari et al scheme and convergent encryption was conducted on cloud application to provide data confidentiality service and cloud storage space efficiency. Tests were conducted through comparing application that implemented this scheme with application that did not implement scheme within the same condition. Based on statistically significant comparison results, application that implements the scheme reduce 5% of storage space and takes less time for files uploading. Moreover, it can prevent attacker to obtain data illegally by implementing the convergent encryption.