PREVENTION SYSTEM OF WRONG COPY, MONITORING NODE AND TRANSMITTING AND RECEIVING NODE

摘要

PROBLEM TO BE SOLVED: To prevent the transfer of data to a wrong equipment, without changing the data themselves via the encryption processing, etc. ;SOLUTION: Each of normal nodes 1 to 1-n has a normal data input/output operation mode, in which the input/output of data is carried out with no application of the data processing, such as the encryption processing, and a protection data input/output operation mode where a wrong node (n) protects the fetching of data. The latter operation mode includes two modes, i.e., a mode where the data which has undergone the encipherment processing are inputted and outputted via a network 20, and the other mode where no input/output of data are carried out via a network 20. Thus, a communication network is constructed by connecting plural normal nodes, so that the input/output of data are freely carried out among the normal nodes. When the connection of a wrong node is detected, a monitoring node 10 gives a command to a group of normal nodes to perform the input/output of data in a protection data input/output operation mode.;COPYRIGHT: (C)1998,JPO