Offensive Security Books

Below are the books that I have found most useful while pentesting.

Hash Crack: Password Cracking Manual – This book is the same small size as the RTFM and is an excellent reference for Hashcat and other cracking tools.

https://www.amazon.com/Hash-Crack-Password-Cracking-Manual/dp/1540444961/ref=sr_1_fkmr2_1?ie=UTF8&qid=1500065865&sr=8-1-fkmr2&keywords=password+cracking+handbook

RTFM – Great reference for command line syntax, networking and etc. It is small and easy to carry with you.

https://www.amazon.com/Rtfm-Red-Team-Field-Manual/dp/1494295504/ref=sr_1_1?ie=UTF8&qid=1500065495&sr=8-1&keywords=red+team+field+manual

The Hacker Playbook 2 – While a couple years old, it actually provides some good techniques and references that are still very useful.

https://www.amazon.com/Hacker-Playbook-Practical-Penetration-Testing/dp/1512214566/ref=sr_1_1?ie=UTF8&qid=1500065584&sr=8-1&keywords=the+hackers+playbook+2

Wireless Hacking Exposed, Third Edition – Practical details on wireless assessment of WiFi and other wireless networks. It is a great reference if you only do wireless testing from time to time.

https://www.amazon.com/Hacking-Exposed-Wireless-Third-Solutions/dp/0071827633/ref=sr_1_1?ie=UTF8&qid=1500066087&sr=8-1&keywords=wireless+exposed