Intrusion Detection Systems

Intrusion Detection Systems (IDS) are security tools that monitor network traffic and system activities to detect and respond to unauthorized access or malicious activities. IDS can be classified into two main categories: network-based IDS (NIDS) and host-based IDS (HIDS).

NIDS operate by analyzing network traffic to identify potential security threats such as unauthorized access attempts, malware, and denial-of-service attacks. NIDS can be placed at various points in a network, such as at the perimeter, within the internal network, or at critical network points.

HIDS, on the other hand, monitor activities on individual hosts or servers to detect and respond to security threats that may bypass network-based security measures. HIDS can identify unauthorized system access, malicious software, and suspicious system activity.

IDS works by comparing observed system or network behavior with a set of predefined rules or known patterns of attacks to identify potential security threats. IDS may also use machine learning algorithms to identify anomalous behavior that may indicate a security threat.

When an IDS detects a security threat, it generates an alert and may take action such as blocking network traffic, terminating suspicious processes, or notifying security personnel. IDS can provide valuable insights into security events and help security teams respond to security incidents quickly and effectively.