Thank you all for your replies.
Hybrid wroteI would say security is a very broad topic, it ranges from web coding security to network security to server's security
Which one do you want to start with?
I'd say I'm very interested in all three, but mostly web coding security and cryptography, I guess, so to say(I'm going to start my reasearch soon because I don't really know how computer security branches out). And I'm doing this because I'm just really interested in computer security in general; protecting my own pc is just a byproduct of that and not the main reason.