Nippon Telegraph and Telephone Corporation

Hiroyuki Nooka

Yuji Yamada

Kazunori Kamiya

Hiroshi Kurakami

Daigo Natsume

A flow information analysis apparatus receives flow information containing a header sample, determines whether the header sample of the flow information matches any of templates that are based on tunneling protocols, and when determining that the header sample matches any of the templates, extract information on a header of the IP packet from the header sample on the basis of the matched template. Further, when determining that the header sample does not match any of the templates, the flow information analysis apparatus extracts information on the header of the IP packet from the header sample on the basis of a result of a search through the header sample for a byte sequence that matches search data in which a value that is set in a specific field of the tunnel header and a value that is set in a specific field of the IP packet are combined.

Flow information analysis apparatus, flow information analysis method, and flow information analysis program

An attack detection device including a packet collection unit that collects packets to be transmitted from a user terminal to a service providing server, a header-information acquisition unit that acquires header information from the packets, and an attack detection unit that determines whether each session is an attacking session by using the header information, wherein the attack detection unit compares a window size of a collected arbitrary packet and window sizes of other packets to one another for each of sessions, and when a comparison result satisfies a predetermined first condition, a corresponding session is detected as an attacking session.

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Tokyo, Japan

Hiroyuki Nooka