| 摘要 |
According to an embodiment of the present invention, a security gateway can include a one-way transmission device and a one-way reception device. The one-way transmission device receives transmission data from an internal system, filters the transmission data, encodes the filtered data, and transmits the encoded data to an external device. The one-way reception device receives reception data from the external device, decodes the reception data, and transmits the decoded data to the internal system. When the data transmitted to the external device has an error, the one-way reception device receives a retransmission request from the external device receiving the data with the error previously and encodes the transmission data according to the retransmission request to transmit the encoded data to the external device. The present invention implements two-way communication by using one-way communication, thereby enhancing reliability of the security. |
