Network Interworking Security Gateway Apparatus and Method

PURPOSE: A network interworking security gateway apparatus and a method thereof are provided to transmit only desired data safely as maintaining the state that networks are separated. CONSTITUTION: A shared memory system(110) temporarily stores transceived messages and data between first and second networks. The first gateway system(120) supports the message/data transceiving between the first network and the shared memory system. The second gateway system(130) supports the message/data transceiving between the second network and the shared memory system. A mobile storage device(140) stores setup files and log files of the shared memory system and the first/second gateway systems and encryption keys used for encoding/decoding the transceived message and data.