Out-of-Band Concealment on Android

Out-of-band concealment is an effective way of concealing data, but is it feasible on Android? In the paper, we will firstly study the out-of-band concealment and VFS(virtual file system), learn how the file system works, and further figure out whether out-of-band concealment can be implemented on the Android system. After analyzing the process and operations what the file system does when it truncates a file, by a series of experiments, we finally realize the out-of-band concealment on Android system. To improve survivability, we should combine out-of-band concealment with other techniques.