Ask HN: Where to start reading on security?

I'm a CS student right now thinking about specializing in security. The problem I have, however, is that I don't know enough about security to know on which particular areas of security I want to focus. I only know enough to realize that it is in of itself a quite diverse field.

My question for all the security guys that hang around here is this: what books or blog should I start with if I want a general introduction to the field? I could just wait for the intro level course at my university, but I like to give myself a head start (especially on introductory courses) as I find that the repetition of teaching myself and being taught in class gives me a much more solid foundation in the material.