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Summary Article Description Protecting your computer network against attack is vital, especially in the highly connected network environment that we live in. One way to monitor your network for intrusive activity is through the installation of an Intrusion Detection System IDSwhich is discussed in this article by Earl Carter.
Given this fact, it is amazing how many of these same businesses install little if any protection to guard their networks from attack and theft of valuable company information. An intrusion detection system IDS is essentially a burglar alarm system for your network.
It enables you to monitor your network for intrusive activity. When intrusive activity occurs, your IDS generates an alarm to let you know that your network is possibly under attack. Like regular burglar alarms, however, your IDS can generate "false positives" or "false alarms".
A false positive occurs when your IDS Anomaly based intrusion detection system an alarm from normal user activity. If your IDS generates too many false positives, then you will lose confidence in the capability of your IDS to protect your network. If you have a burglar alarm that continually goes off incorrectly, the police will become conditioned to the fact that your establishment is prone to false alarms.
During an actual break-in, the police may not respond as quickly, thinking that the alarm is just another false alarm. Therefore, it is crucial that you configure your IDS to minimize the number of false positives that it generates. You IDS may also experience false negatives.
An intrusion detection system (IDS) monitors network traffic and monitors for suspicious activity and alerts the system or network administrator. In some cases, the IDS may also respond to anomalous or malicious traffic by taking action such as blocking the user . An anomaly-based intrusion detection system, is an intrusion detection system for detecting both network and computer intrusions and misuse by monitoring system activity and classifying it . International Journal of Computer Applications ( – ) Volume 28– No.7, September 28 Figure 2: Common Anomaly Based Network Intrusion detection System Figure 3: Classification of Anomaly Based Intrusion Detection.
In this situation, an attack occurs against your network, and your IDS fails to alarm even though it is designed to detect such an attack. Your IDS should almost never generate false negatives.
In fact, it is preferable for your IDS to actually generate more false positives rather than generating any false negatives. Triggering Mechanisms To protect your network, your IDS must generate alarms when it detects intrusive activity on your network. Different IDSs trigger alarms based on different types of network activity.
The two most common triggering mechanisms are the following: Anomaly detection Misuse detection Besides implementing a triggering mechanism, your IDS must somehow watch for intrusive activity at specific points within your network.
Monitoring intrusive activity normally occurs at the following two locations: Host-based Network-based Finally, many intrusion detection systems incorporate multiple features into a single system.
These systems are known as hybrid systems. Anomaly Detection With anomaly detection, you need to create a profile for each user group on your system. These profiles can be built automatically or created manually.
How the profiles are created is not important as long as the profiles accurately define the characteristics for each user group or user on your network. These profiles are then used as a baseline to define normal user activity. If any network activity deviates too far from this baseline, then the activity generates an alarm.
Because this type of IDS is designed around user profiles, it is also sometimes known as profile-based detection. Advantages Anomaly detection systems offer several benefits.
First, they can detect insider attacks or account theft very easily. If a real user or someone using a stolen account starts performing actions that are outside the normal user-profile, it generates an alarm. Second, because the system is based on customized profiles, it is very difficult for an attacker to know with certainty what activity he can do without setting off an alarm.This primer on intrusion detection defines anomaly versus signature detection and network- versus host-based systems.
Visit our intrusion detection resource center intrusion detection system. the limitations of anomaly-based intrusion detection systems by using both generalization and characterization techniques.
By using generalization, a more abstract description of an. Top Free Network-Based Intrusion Detection Systems (IDS) for the Enterprise (HIDS) and network-based intrusion detection systems (NIDS).
HIDS solutions are installed on every computer on the network to analyze and monitor traffic coming to and from the node in question. Bro IDS uses anomaly-based intrusion detection, and is usually. New types of what could be called anomaly-based intrusion detection systems are being viewed by Gartner as User and Entity Behavior Analytics (UEBA) (an evolution of the user behavior analytics category) and network traffic analysis (NTA).
An intrusion detection system (IDS) monitors network traffic and monitors for suspicious activity and alerts the system or network administrator. In some cases, the IDS may also respond to anomalous or malicious traffic by taking action such as blocking the user . Given the promising capabilities of anomaly-based network intrusion detection systems (A-NIDS), this approach is currently a principal focus of research and development in the field of intrusion detection.
Various systems with A-NIDS capabilities are becoming .