| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system capable of confirming data arrival transferred by a data diode with achieved security measures using the data diode.SOLUTION: A computer (data transmission side) 21 transmits data to a computer (data reception side) 31 through a data diode 11, and the computer (data reception side) 31 replies the computer (data transmission side) 21 with arrival confirmation data through a general-purpose communication line 12. The computer (data reception side) 31 includes: an error detection circuit 33 for detecting an error of data having an added redundant bit; and an arrival confirmation transmission circuit 35 for transmitting the arrival confirmation data based on the error detection result. The computer (data transmission side) 21 includes an arrival confirmation reception circuit 26 for receiving the arrival confirmation data. The arrival confirmation transmission circuit 35 and the arrival confirmation reception circuit 26 are configured to process only arrival confirmation data having a predetermined return value. |
