title: iOS 5: Data encryption AES-256 EncryptWithKey: not found
body: <p>Question is about iOS5 application.  I have a view controller where I have some UITextFields.
  I would like to encrypt data using AES-256.  </p>
  
  <p>In fact, I don't know what are the prerequisite packages that I have to add to do encryption and decryption.  I have gone trough other posts but too much explanation messed it up.</p>
  
  <p>Kindly let me know what and all packages, header files  I have to include to encrypt data using AES-256</p>
  
  <p>Chandra</p>