| 摘要 |
PROBLEM TO BE SOLVED: To prevent of illegal communication data from one network from entering the other network even when the illegal communication data enters a gateway. SOLUTION: A non-secure network gateway 11 and a secure network gateway 12 are obtained, respectively, as virtual computers configured on physical hardware of a real computer, and connected to a non-secure network 1 and a secure network 2 which use standard protocols whose specifications are disclosed by standard protocol communication parts 20, 25. Between non-standard protocol communication parts 22, 23 of the respective sub-gateways 11, 12, data is transferred using non-standard protocols whose specifications are not disclosed and data is transferred between the non-standard side and the standard side only for an application layer. Protocol conversion parts 21, 24 refer to relay permission setting tables 30, 31 and only when relay is permitted, converts the protocol. COPYRIGHT: (C)2009,JPO&INPIT
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