Hackers are categorized into the following classes:

* Black Hat Hackers (Crackers): These are persons who are computer specialists and use their hacking skills to carry out malicious attacks on information systems.
* Gray Hat Hackers: These are persons who sometimes do not break laws and help to defend a network, but sometimes act as Black Hat Hackers.
* White Hat Hackers (Ethical Hackers): These are persons who have excellent computer skills and use their knowledge to secure information systems.
* Security Providing Organizations:
Some organizations and communities also provide security to information systems.

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Tutorials (overflow, using debugers, exploits coding…)

* Stack based overflows (direct RET overwrite) : (Tutorial Part 1) http://www.corelan.be:8800/index.php/2009/07/19/exploit-writing-tutorial-part-1-stack-based-overflows/ * Jumping to shellcode : (Tutorial Part 2) http://www.corelan.be:8800/index.php/2009/07/23/writing-buffer-overflow-exploits-a-quick-and-basic-tutorial-part-2/ * Stack based overflows – SEH (Tutorial Part 3)

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TCP/IP Tutorial

This tutorial is intended to supply a brief overview of TCP/IP protocol. Explanations of IP addresses, classes, netmasks, subnetting, and routing are provided, and several example networks are considered. The

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Double Your Defense with a Double Firewall

If you have a home network router, your computer and other computers on the network (such as your spouse’s laptop and your children’s computer) are protected from the outside world.

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