Security on Android
Android is a popular OS with rich variety of applications available from PlayStore. Android controls an app's access to various system services (e.g. WiFi, camera, telephony functions, contacts etc.) by requiring the user to grant requisite permissions at the time of installing apps. Once permissions are granted to an app for accessing certain services, they remain effective until app is uninstalled. When installing an app for certain use, most users search the PlayStore and often pick the top recommended or rated free or paid app that meets their requirement. Once an app has been selected most users install it without paying much attention to the permissions demanded by that app, much less the implications of granting those permissions. Even though Google has simplified the descriptions of various permissions, still a normal non-technical user often cannot assess the real implications of granting those permissions to an app. Given an app's functionality, what permissions