SECRET PROTECTING METHOD FOR TRANSMISSION OF INFORMATION

摘要

PURPOSE:To completely prevent connection to an outsider by cutting once a connected circuit and then connecting this circuit again via the reception side. CONSTITUTION:A reception side device 15 sends a received password and the station address of a transmission side device to an arithmetic circuit 5 to collate them with the password registered previously in a memory area of a memory 6. Then a circuit that requested the communication once is cut and the station address of the device 16 stored in the memory 6 is read out and called. The device 16 collates the password of a received data format with the registered password and connects a circuit when the coincidence is obtained between both passwords. Thus it is not required to double and triple the password nor to supply a long password. Thus the secret is protected even in case the password is leaked out to an outsider.