| 摘要 |
PROBLEM TO BE SOLVED: To provide a system for specifying an attack packet source quickly. SOLUTION: Intersections (two) of respective circles having centers at the positions ((x<SB>1</SB>, y<SB>1</SB>), (x<SB>2</SB>, y<SB>2</SB>)) of two attack packet source distance measuring devices 1011 and 1012 for measuring the distance from an attack computer and radii equal to the distances (r<SB>1</SB>, r<SB>2</SB>) from the attack computer observed at respective attack packet source distance measuring devices 1011 and 1012 become attack packet source candidates. In order to narrow down two candidates to one, a third attack packet source distance measuring device 1013 is prepared. An intersection having the position ((x<SB>3</SB>, y<SB>3</SB>)) of that device as a center and the attack packet source distance (r<SB>3</SB>) as a radius becomes the position of the attack packet source. COPYRIGHT: (C)2007,JPO&INPIT
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