Cracking Hacker's Secret is the topic of our seminar for us IT in PUP-QC. It was discussed by JayConrad S. Ongjoco, an Information Security Consultant of Hewlett Packard (a.k.a. HP).
I will just simplify some of the discussed topic. And we will define first:
Hacker - computer user who works to understand the ins and outs of computers, networks, and the Internet.