title: Android File Cryptography
body: <p>How to make encryption and decryption on an application's files in sd-card? so that i may secure the files on the sdcard and no  other person will be able to access outside of that application with out  decryption on those files??</p>
  
  <p>Is there any person who can give me any good example source to implement the encryption on android application?</p>