随着基于Android[1]等移动终端的普及以及信息技术的飞速发展，智能手机逐渐成为人们的信息中心和计算中心，用户在手机上存储越来越多的个人信息（包括短信、通话记录和图片等），这些信息的泄露给用户带来了不可估量的损失。基于Android系统的移动终端的安全性问题[2]，已经得到越来越多专业人员的关注和重视。 Android手机“保险箱”实现了对用户短信、图片、音频以及视频文件进行加密保护功能，同时还为用户提供了“取消保护”（即用户将加入“保险箱”的文件取消保护并返回其原路径）与“彻底销毁”功能，使得用户可以方便快捷地管理自己的隐私文件。 本系统以JAVA为主要开发语言，涉及数据库、文件加密与读写等相关知识，以Eclipse为开发工具，最后生成一个用于Android平台的应用程序。

With the rapid development of information technology and mobile terminals based on Android, smart phones increasingly become the information center and the computing center of people. More and more personal information is stored on the phone including text messages, call records and images, disclosure of which brings immeasurable loss to the user. The security issues of mobile terminals based on Android system, have got more and more professional concern and attention. The safe box can not only encrypt the user messages, pictures, audio and video files to protect them, but also provide users with "Cancel Protection" feature by which the user will cancel protection and return encrypted file to its original path and "completely destroyed" feature allowing users to quickly and easily manage their privacy documents. This system is a major development in JAVA language, involving databases, file encryption and literacy-related knowledge. Eclipse is development tool, and finally generates an application for the Android platform.