Android 加密 解密

参考

Android secure encrypted SharedPreferences example Tutorial

http://www.tutorialsface.com/2015/09/android-secure-encrypted-sharedpreferences-example-tutorial/

Android 加解密类Cipher    

http://blog.csdn.net/kyoky_xxj/article/details/9229013

Base64编码及其做用    

http://blog.csdn.net/benbenxiongyuan/article/details/7756912

Cipher类    

http://book.2cto.com/201312/37681.html

MessageDigest简介    

http://blog.csdn.net/hudashi/article/details/8394158

SecureRandom简介

http://swiftlet.net/archives/1352