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Due to the rapid developments of cloud technologies, mobile devices, especially smartphones, have become much more powerful, bringing people great convenience. People can do many things on their smartphones: checking email, updating Facebook/Snapchat/Instagram, or shopping via different apps. With all these applications, people tend to access their smartphones frequently and instantly, i.e., they want to use the phone right away. On the other hand, more and more sensitive information is nowdoi:10.15344/2456-4451/2017/113 fatcat:a7cggsnf5jgnrel2rwi5olpziq