Description:
Intrusion detection systems (IDS) are usually deployed along with other preventive security mechanisms as a second line of defense that protects information systems. Even if preventive security mechanisms can protect information systems successfully, it is still desirable to know what intrusions have happened or are happening, so that the users can understand the security threats and risks and thus be better prepared for future attacks. This book unites three research contributions detailing new approaches that are superior to existing centralized or hierarchical approaches.