So after working as an assistant to a network admin for a little while now, I've found myself getting more interested in the security side of things. Anyone know of any resources (online or book) to learn some more about this?
Yeah, a book about hacking isn't exactly going to be focused on the security aspect of things :p But knowing how various hacks work and all the different ways around things will certainly help you develop systems to prevent those workarounds and exploits.
Security in Computing
Charles P. Pfleeger, Shari Lawrence Pfleeger
The classic guide to information security--fully updated for the latest attacks and countermeasures
It's pretty thorough! The first thing it goes into is the goals of computer security: Confidentiality, Integrity, and Availability. And then goes on to explain the things you need to do to maintain this "CIA triad".
PS I have the second edition from a while ago, but I see it's now up to its 4th edition.