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Smartphone is becoming ubiquitous and its sales proportions have exceeded the sales of personal computer systems since 2012. The number of smartphones will increase and perhaps at an even higher rate in the coming years. The computational capacity and numerous mobile applications benefit end user's daily life. At the same time, it stores user's personal information, such as calendar event, photo, geo-location, and manages the access to the private online resource, such as bank account, email. It is thus non-trivial to resolve the security risks of smartphone privacy leakage.