merkow ppt 12-JRM
merkow ppt 12-JRM
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