Hacking: The Art of Exploitation (2nd Edition) by Jon Erickson (E-book)

This is one of the best books which will take you through the technicalities of areas like programming, shell code and exploitation. Regardless of whether you are a beginner or have very little hacking knowledge, this book will help you understand the complexities of the digital security tasks.
This excellent and well written book will make you learn all the clever stuff of getting access to a system.
Download link:
http://www5.zippyshare.com/v/92045308/file.html
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Enjoy!