| 摘要 |
PROBLEM TO BE SOLVED: To prevent a fraudulent act without increasing a burden of a controller of each board.SOLUTION: A communication system communicates processing data between a sub-board 12 having a control circuit 72 and an LSI T43 for communication, and a device board 13 having a control circuit 77 and an LSI T44/T45 for communication. The LSI T43 for communication encrypts the processing data received from the control circuit 72, and transmits the encrypted data to the LSI T44/T45 for communication. The LSI T44/T45 for communication decrypts the processing data and transmits the decrypted data to the control circuit 77. The processing data output from the control circuit 72 includes information on the timing at which the processing data is transmitted to the control circuit 77, and at at least one of the LSI T43 for communication and the LSI T44/T45 for communication, the timing at which the processing data is transmitted to the control circuit 77 is controlled based on the information. |
