protected static String encryptString(String data){
  crc32.reset();
  crc32.update(data.getBytes());
  return Long.toHexString(crc32.getValue());
}

protected static String encryptString ( String data ) { crc32 . reset ( ) ; crc32 . update ( data . getBytes ( ) ) ; return Long . toHexString ( crc32 . getValue ( ) ) ; }
routine to get crc32 value for given string used as helper function when encrypting folder and file names
