(also HIDS, host intrusion detection system)
Host-based intrusion detection system is a security mechanism designed to detect unauthorized or malicious activities occurring on a single host or endpoint device. It monitors and analyzes the internal activity and state of the host system, looking for signs of intrusion or malicious behavior.
HIDS provides an additional layer of security for individual hosts, complementing network-based security measures. By focusing on the internal state of a host, it can often detect attacks that might go unnoticed by network-based solutions. However, HIDS has some limitations and should be used in conjunction with other security measures, like firewalls, antivirus software, and regular system updates, to ensure comprehensive protection against intrusions.
See also: network intrusion protection system
HIDS operates directly on the host, typically through software installed on the system. This allows more visibility into the activities happening on the host, including file integrity monitoring, system log analysis, and process monitoring.
HIDS monitors system files, configuration files, system logs, registry entries, and network connections of the host. It compares the observed behavior against known patterns or predefined rules to identify suspicious or malicious activities. When an intrusion or policy violation is detected, HIDS can generate alerts, send notifications to administrators, and in some cases, take automated actions to mitigate the threat.
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