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merkow ppt 12-JRM

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Intrusion Detection Systems (IDS)<br />

� IDSs attempt to detect an intruder breaking<br />

into systems or an authorized user misusing<br />

system resources<br />

� IDSs are needed to detect both types of<br />

intrusions<br />

� Break-in attempts from the outside<br />

� Knowledgeable insider attacks<br />

� Two basic philosophical options<br />

� Prohibit everything that is not expressly permitted<br />

� Permit everything that is not expressly denied<br />

© Pearson Education Information Security:<br />

Principles and Practices 30

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