| 摘要 |
PROBLEM TO BE SOLVED: To improve the security by allowing only a mobile host pertaining to its own organization to access the its own organization externally in the communication based on a virtual internet protocol. SOLUTION: A fire wall 300 and a mobile host 24 store respectively the same key information and the same arithmetic operation method, and when the mobile host 24 moves from a network 21 and connects to a broad area network 23 and sends a packet to a host 25, the host 24 confirms authentication information based on the key information and information included in a header of the packet and sends packet including it in its header information. The fire wall 300 relays a racket when the authentication information calculated similarly based on the key information and the header information of the packet from the mobile host 24 is matched with the authentication information included in the header information.
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