Intrusion Detection System (IDS)
Table of Contents:
What is Intrusion Detection System (IDS) ?
An intrusion detection system (IDS) is a security technology designed to detect and respond to unauthorized access, misuse, or other malicious activity on computer networks or systems.
How it Works ?
It works by monitoring network traffic, system logs, and other security-related events to identify suspicious behavior or indicators of a security breach. IDS can be configured to operate in either a passive or active mode. In passive mode, the IDS only monitors and alerts security personnel to potential security breaches, while in active mode, it can take automated actions to prevent or mitigate an attack.
Types of IDS:
IDS can be classified into three categories:
1. Network-based IDS
Network-based IDS monitors network traffic and looks for patterns or signatures that match known attacks or abnormal behavior. It works by analyzing data packets and examining them for signs of malicious activity.
2. Host-based IDS
Host-based IDS monitors activity on individual systems or servers and looks for signs of malicious activity, such as changes to system files or unauthorized access attempts. It is installed on each device and monitors its activity.
3. Hybrid IDS
Hybrid IDS combines the capabilities of both network-based and host-based IDS. It provides comprehensive security monitoring by detecting network and host-level threats.
IDS Softwares:
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Snort:
Snort is an open-source network-based IDS that can be used to monitor network traffic for signs of malicious activity. It uses signature-based detection to identify known attacks and anomaly-based detection to identify new and unknown threats. -
Suricata:
Suricata is another open-source network-based IDS that uses signature-based and anomaly-based detection to identify threats. It is highly customizable and can be used to monitor a wide range of network protocols. -
OSSEC:
OSSEC is an open-source host-based IDS that can be used to monitor activity on individual systems or servers. It uses log analysis, file integrity monitoring, and rootkit detection to identify potential security breaches. -
Tripwire:
Tripwire is a commercial host-based IDS that can be used to monitor file and system changes on individual systems or servers. It is highly customizable and can be configured to monitor specific files or directories for changes.
IDS is an important security technology for protecting computer networks and systems from cyber threats. By using a combination of network-based and host-based monitoring and analysis, IDS can help to detect and respond to potential security breaches before they cause damage. The choice of IDS software will depend on the specific needs and requirements of an organization.