Unauthorized access tracking

特許 係属中 PROBLEM TO BE SOLVED: To provide a system for tracking unauthorized access such as DoS attack with high precision. ; SOLUTION: In the method for tracking unauthorized access, a traffic measuring section 101 for logging temporal transition in number of packets from a network traffic as a traffic pattern having a width of a predetermined time T, and a storage section 102 for storing the information of traffic pattern are provided at each observation point.