The design and implementation of invisible eavesdropping protection application

“Invisible eavesdropping” in this paper means that some applications call the mobile phone´s microphone module and gather the user´s voice and transmit information illegally when the screen is locked or the users are playing games and completely unaware of the situation. Based on idea of “real-time monitoring” and “active protection”, a scheme was proposed in this paper using the access authority of mobile phone´s microphone, network access, user trust and etc. This scheme implements the function of alarm and threat position in the open source Android mobile platform. Compared with the domestic and foreign products, the system has the following specific characteristics: (1) it can boot automatically and scan on the backstage without multiple settings after it installed and set up for the first time; (2) compared with some of the existing protection software, when the invisible eavesdropping happened, this application will alarm the users, but not just to protect the files in the phone; (3) the application can navigate to the specific risk of eavesdropping applications; (4) it need not the authority of “root” or to modify the kernel.