It is estimated by the International Telecommunication Union that the total number of mobile devices in the world has already exceeded the number of people. Mobile devices are becoming increasingly advanced as well. In fact, modern smartphones are as powerful as desktop computers, but “know” much more about their owners: current and past location, contents of their private text messages, photos and other sensitive information, as well as their online banking credentials and other financial data. They are also always connected to the Internet and thus are especially vulnerable to hacking and malware exploits.