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 **Cryptography**
 - [Crypto 101](https://www.crypto101.io/) by Laurens Van Houtven.
+
+**Penetration Testing**
+- [The Art of Exploitation by Jon Erickson, 2008](https://www.nostarch.com/hacking2.htm)
+- [Metasploit: The Penetration Tester's Guide by David Kennedy et al., 2011](https://www.nostarch.com/metasploit)
+- [Penetration Testing: A Hands-On Introduction to Hacking by Georgia Weidman, 2014](https://www.nostarch.com/pentesting)
+- [Rtfm: Red Team Field Manual by Ben Clark, 2014](http://www.amazon.com/Rtfm-Red-Team-Field-Manual/dp/1494295504/)
+- [The Hacker Playbook by Peter Kim, 2014](http://www.amazon.com/The-Hacker-Playbook-Practical-Penetration/dp/1494932636/)
+- [The Basics of Hacking and Penetration Testing by Patrick Engebretson, 2013](https://www.elsevier.com/books/the-basics-of-hacking-and-penetration-testing/engebretson/978-1-59749-655-1)
+- [Professional Penetration Testing by Thomas Wilhelm, 2013](https://www.elsevier.com/books/professional-penetration-testing/wilhelm/978-1-59749-993-4)
+- [Advanced Penetration Testing for Highly-Secured Environments by Lee Allen, 2012](http://www.packtpub.com/networking-and-servers/advanced-penetration-testing-highly-secured-environments-ultimate-security-gu)
+- [Violent Python by TJ O'Connor, 2012](https://www.elsevier.com/books/violent-python/unknown/978-1-59749-957-6)
+- [Fuzzing: Brute Force Vulnerability Discovery by Michael Sutton et al., 2007](http://www.fuzzing.org/)
+- [Black Hat Python: Python Programming for Hackers and Pentesters by Justin Seitz, 2014](http://www.amazon.com/Black-Hat-Python-Programming-Pentesters/dp/1593275900)
+- [Penetration Testing: Procedures & Methodologies by EC-Council, 2010](http://www.amazon.com/Penetration-Testing-Procedures-Methodologies-EC-Council/dp/1435483677)
+- [Unauthorised Access: Physical Penetration Testing For IT Security Teams by Wil Allsopp, 2010](http://www.amazon.com/Unauthorised-Access-Physical-Penetration-Security-ebook/dp/B005DIAPKE)
+- [Advanced Persistent Threat Hacking: The Art and Science of Hacking Any Organization by Tyler Wrightson, 2014](http://www.amazon.com/Advanced-Persistent-Threat-Hacking-Organization/dp/0071828362)
+- [Bug Hunter's Diary by Tobias Klein, 2011](https://www.nostarch.com/bughunter)
+- [Advanced Penetration Testing by Wil Allsopp, 2017](https://www.amazon.com/Advanced-Penetration-Testing-Hacking-Networks/dp/1119367689/)