Anomaly-Based Intrusion Detection System

An Anomaly-Based Intrusion Detection System (IDS) monitors a computer network's normal behavior to identify unusual activity that may indicate a security threat. It learns what typical usage looks like—such as login times, data access, and traffic patterns—and flags deviations from this baseline. When something abnormal occurs, like a sudden increase in data transfer or strange login times, the system alerts administrators for further investigation. This approach helps detect new or unknown threats that don’t match known attack signatures, enhancing security by focusing on unusual patterns rather than predefined attack types.