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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Error Messages

Error Messages Overview Think about these questions. * Why are Error Conditions and Error Messages a security problem? * What’s wrong with error conditions? * Wouldn’t an administrator want the

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You’ve Hired a Hacker

There is a wonderful variety among humans. Ethnicity and culture provide one of the most important dimensions–but there can be profound differences between two people who look the same. If

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