To support your learning related to the science of hacking and cracking. You need guidance on such as Backtrack, Pen test, Encryption, Exploit and many more. I will provide the e-book collection that I have.
E-Book lists:
* Hackers High School 13 Complete Hacking
* Penentration Testing With Backtrack 5
* A Beginners Guide To Hacking Computer Systems
* Black Book of Viruses and Hacking
* Secrets of Super and Professional Hackers
* Dangerours Google Hacking Database and Attacks
* Internet Advanced Denial of Service (DDOS) Attack
* and many more**
Enjoy!