I agree with using "htaccess and cgi". That's the easiest way. When the student uploads the file, have the cgi script scan it for a student number and file it in the appropriate directory. htaccess is easy to get working, and there are numerous ways to upload files to a cgi script using lwp. Just talk your professor into setting up a "password protected homepage" for each class. Just make sure that the "storage directory for uploaded homework" isn't accesible by a browser, or you could get rampant copying. :-)