Design And Implementation Of Privacy Protection Under The Android Environment

With the growing popularity of smart phones and mobile Internet users continues to increase, more and more personal mobile security issues are getting attention. Android platform is a new mobile operating system, and the market share of it reaches more than half of the smart phones in recent years. Since Android is an open operating system, users can access its source code, and can make their own Android applications and publish them in the Android application market. This mechanism makes Android more complex security problems, users’ private information are at risk of leakage.For this situation, we designed a privacy protection system based on the Android platform. The system can be subdivided into privacy rights protection module, private files encryption and transmission module, private files hiding and compressed storage module.1) In the privacy rights protection module, for the possible expanded permission attack to applications, this paper designed a test system. Through examination of the manifest file, this system can identify if the application can violate user privacy by expended permission attack.2) In the private files encryption and transmission module, the module encrypts private files through the realization of AES, DES algorithm. This module also proposed an improved algorithm to transmit the encrypted files. In this algorithm, the data will be divided into several blocks before transmission. Only the first data block will be encrypted, and the remaining data blocks will do bitwise XOR with the first block of data to reduce the complexity of encryption transmission and reducing bandwidth consumption.3) In private files hiding and compressed storage module, the paper achieved the goal of hiding the private message and private picture. If the user wants to view the file, he should enter the right password. This module also realized private massage compressed storage by using Huffman algorithm and private picture compressed storage by using JPEG2000technology.The testing results of this system showed that the work done in this paper achieved good efficiency in aspects of detecting permissions, file encryption, file compression and transmission.