Hyökkäysilmaisimet

Hyökkäysilmaisimet, often translated as intrusion detection systems (IDS), are network security tools used to monitor network traffic for suspicious activity or policy violations. Their primary purpose is to identify and alert administrators to potential threats, such as unauthorized access attempts, malware infections, or denial-of-service attacks. These systems analyze network packets and system logs, comparing them against a database of known attack patterns or established baseline behaviors.

There are two main categories of intrusion detection systems: network-based intrusion detection systems (NIDS) and host-based intrusion detection systems (HIDS). NIDS monitor network traffic traversing a network segment, while HIDS are installed on individual hosts and monitor system activities and logs. Some systems also combine features of both.

Intrusion detection systems can employ various detection methods. Signature-based detection relies on matching traffic patterns against a database of known attack signatures. Anomaly-based detection establishes a baseline of normal network behavior and flags deviations from this baseline as potentially malicious. Misuse-based detection is similar to signature-based but can be more flexible in identifying variations of known attacks.

Upon detecting a potential threat, an IDS typically generates an alert. This alert can be sent to a security administrator via email, logged in a system, or forwarded to a security information and event management (SIEM) system for further analysis and correlation with other security events. While IDS are crucial for security monitoring, they do not actively prevent attacks. That function is typically carried out by intrusion prevention systems (IPS), which can take action to block malicious traffic.