CONFIDENTIAL COMMUNICATION METHOD USING VPN, A SYSTEM AND PROGRAM FOR THE SAME, AND MEMORY MEDIA FOR PROGRAM THEREFOR

摘要

The confidential communications system of the present invention uses a first communications network which is the Internet where confidential communications by VPN between user terminals is available and a second communications network which is a voice transmission circuit network. A transceive processing unit (5) of communications control devices (3) completes authentication between users by operating P2P access between each of the communications control devices (3) considering certain information about each of the users accessing P2P of a recording unit (4) of the communication control devices (3) before confidential communication by the VPN. A confidential communications preparing unit (70) of the communication control devices (3) exchanges VPN combination information required for VPN combination in the first communications network between the communications control devices (3) through the second communications network. An exchanger unit (71) of the communications control devices (3) discloses confidential communications by the VPN in the first communications network by a communications method based on the VPN combination information exchanged by the second communications network.