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Redback Council is the site of Cyber Security and Forensics.
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An intrusion detection system is a device or software application that monitors a network or systems for malicious activity or policy violations. Any malicious activity or violation is typically reported either to an administrator or collected centrally using a security information and event management system.
A "network intrusion detection system (NIDS)" monitors traffic on a network looking for suspicious activity, which could be an attack or unauthorized activity.
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Signature-based system This type of NIDS uses signatures from previously analyzed attacks. It learns which patterns indicate malicious activity so future events with similar characteristics will be detected immediately. Signature-based systems do not need any knowledge about the normal behavior of users or applications to operate.
Stateful protocol analysis system This type of NIDS is similar to a signature-based system in that it learns which patterns indicate malicious activity. Stateful protocol analysis systems differ because they do not need to know what specific attacks look like before they are detected. Instead, it can maintain temporary information about how your network normally operates and will compare new events against the normal traffic rate of existing connections.
Behavioral-based system This type of NIDS uses behavioral analysis to determine whether any suspicious activity has occurred. If the behavior being analyzed meets certain conditions set by the administrator, an alert will be triggered so appropriate action can be taken in response to malicious activity.
Anomaly-based system This type of NIDS is similar to the behavior-based system, except that it learns what typical network behavior looks like by analyzing how real connections are established and used over time. The administrator may also need to provide information about which events should trigger alerts if anomalies are detected. This type of system is configured to learn what the normal traffic on your network looks like, which can reduce false-positive rates, however, changes in user computer activity or changes made by new software installations could also trigger false alarms.
Heuristic-based system This type of NIDS uses heuristics to look beyond attacks with known signatures and analyze them against a set of rules to determine whether any suspicious activity has occurred. The heuristic-based system is capable of detecting advanced attacks without previously knowing what those attacks look like by looking for a combination of characteristics that indicate a possible security issue.
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