| 摘要 |
PROBLEM TO BE SOLVED: To judge that illegal access is detected from information itself included in a packet, to intentionally let an illegal request source trespass, to deliberately make the trespasser think that the access has been successful, and to gather information (object of access, address of trespasser, procedure, etc.), regarding the illegal action meanwhile. SOLUTION: An illegality detecting server 1 receiver packets sent from an information processor 2 to an information processing server 3 as the transmission destination, analyzes information included in the received packets to detect a packet having an illegal purpose, adds a mark representing the illegal packet to the illegal packet, and sends them to an information-processing server 3, having a function of deciding the marker or an undercover server 4; and the information processing server 3 or undercover server 4 having received the illegal packet with the added mark performs the processing to avoid illegality, such as the transmission of false information to the information processing terminal 2 which has sent the illegal packet.
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