code: public static String decrypt(String base64Encrypted) {
  		if (base64Encrypted != null) {
  			byte[] enc = Base64.decode(base64Encrypted, Base64.DEFAULT);
  			byte[] result = doFinal(Base64.decode(getBase64Key(), Base64.DEFAULT), Cipher.DECRYPT_MODE, enc);
  			return new String(result);
  		}
  		return null;
  	}
docs: Returns the original data. Avoid calling this method on the UI thread if possible, since it may access to shared
  preferences.
  
  @param base64Encrypted
  @return the original data