REMOTE CENTRALIZED CONTROL SYSTEM AND CENTRALIZED CONTROL METHOD FOR NETWORK

摘要

PROBLEM TO BE SOLVED: To provide a system for attaining high security in a configuration in which a plurality of remote devices are centrally controlled and managed.;SOLUTION: A signal to be transmitted and received between a concentrator and each remote device is encrypted to set or monitor each remote device, and the encrypted signal is multiplexed with communication data to be transmitted. The concentrator has an encrypting part 103 for encrypting a control signal to each remote device, a multiplexing part 104 for multiplexing the encrypted control signal with transmission data and transmitting them, a separation part 106 for separating an encryption response signal from a received signal from the remote device, and a decrypting part 107 for decrypting the encryption response signal. Each remote device has a separation part 202 for separating the encrypted control signal from a signal received from a port circuit, a decrypting part 203 for decrypting the encrypted control signal, an encrypting part 206 for encrypting a response signal corresponding to a control signal, and a multiplexing part 207 for multiplexing the encrypted response signal with transmission data and transmitting them.;COPYRIGHT: (C)2004,JPO