Key Technology Of Android System Data Protection

With the development of contemporary communication and continuous improvement of the performance of mobile terminals which have come into the intellective digital era, Android taking advantage of its openness has become the mainstream operate system. Android takes a place in most of the market in smart phone、tablet PC、smart television, making more and more deep step into peoples’life and working area.With the rising quantity of users, the relationship between Android and users has become much compacter. However Android has become the severely afflicted area of safety due to its openness, and the main problem in safety is the leakage of users’private message. According to the difference of storage location, the data in Android system are divided into the inner data in SQLite database and the outer data in SD card. The thesis takes the problem of data safety as research object, on the one hand, aiming at the safety problem caused by data stored as clear text in SQLite database, referencing the security mechanism of other mature database, adding the function of transparent encryption, on the other hand, aiming at the problem of low limits for authority of file access, it adds the function of file encryption, making each application take cryptographic measures to protect the files stored in SD card.The experiment shows that, the re-customized Android system has the function of SQLite encryption and SD card file encryption which satisfying the high performance requirement of security by application. The highly cryptographic Android system has the ability to prevent rogue program reading the SQLite database or scanning the SD card for filching private message which enhancing the safety performance of Android system immensely and preferably protecting users’ private information and application developers commercial information as well.The achievement obtained in the research is summarized in the last part of the thesis and the deficiencies of the research are pointed out. Some open issues in Android security protection as well as the future work are presented.