Actually this is a presentation that I made for a seminar at Dinabandhu Andrews Institute of Technology and Management. Here I'm just gooing to give a preview of the content and links to it..
It starts with virus and protection from them. It also have a brief description on trijan,worm and spywares. Then it is followed by what is hacker? and their attitude, their work, the basic skills requird, different classification and how to be one. And finally how to hack, why we need to know all this, the phases involved in hacking.
You can dowload the presentation with ppt viewer integrated @ http://jit.ray.c.googlepages.com/ComputerSecurity.exe
Or See in online @http://www.scribd.com/doc/3543384/Computer-Security- (all slides may not be visible)