Design Of The Private Data Protection System For Android Device

With the development of mobile device technology, smart phone is becoming an important part of our daily life. There is no denying that the diversity of apps is the key to make smart phone so attractive. But once the app is malicious, our data and property will be under threaten.Encryption technology is a good way to protect our data against malicious apps. Unfortunately, there are some factors restrict it to be widely deployed. First, most developers don’t realize the importance to encrypt users data. Second, it’s a tough work for user to remember the complicated password.Third, there is no perfect way for the app which don’t have a server, to store their key safely.Besides. In consider of Android’s police for app management, the system won’t delete those data which are stored on external storage. And in one hand the left data will occupy the storage. In other hand, it create the condition for malicious app to access those data.To solve these problem, this thesis propose a new way to protect users private data. First, it use apps own information to calculate a unique key for every app without peoples’ help. So user don’t need to remember the encrypt key. Second, design a Transparent Encryption system to process users’ data without of changing user experience, and this is based on Xposed framework, which is an open source project to hook android’s Java code. Third, introduce the KeyStore technology to store every apps’ key to against the malicious apps even they run as root. Forth, monitor and record the file access operation. To figure out which app the file belongs to. And remind user to delete data when their host applications have been uninstalled.