A system for the secure transfer of data and data management on the Internet has a data encryption and transfer module operable in a user computing system, a data management module operable in a sewer computing system, the transfer of data between the user and the server computing systems being effected on the user computing system through use of the data encryption and transfer module, by moving the data to or from a first desktop window, associated with the user computing system, from or to a second desktop window, associated with the server computing system, each window being associated with a password, such that the step of moving the data from one window to the other causes the data to encrypted/re-encrypted from one associated password to the other.