Patent ID: 9185092
Filing Date: 2015-11-10
Classification: H04L

Abstract:
1. A confidential-communication system using a Virtual Private Network (VPN) for performing a confidential communication between terminals of a plurality of users by authenticating the users before exchanging VPN connection information, the users using a wide area network such as the Internet, wherein the system uses a first network that is the wide area network and a second network that is a wireless or wired Peer to Peer (P2P) network, wherein the second network is a voice communication network, a communication control device is provided for the terminal of each of the users and configured to enable communication via the second network by using a modem, the communication control device includes a memory portion for storing specific information which can specify another party of the P2P connection, a send/receive-processing portion, a confidential-communication preparation portion, and a switching portion, the send/receive-processing portion causes the P2P connection to be established between the respective communication control devices by referencing the specific information of the P2P connection in the memory portion before confidential communication using the VPN over the first network starts, the user authentication includes establishment of the P2P connection as an authentication factor, the confidential-communication preparation portion exchanges the VPN connection information between the communication control devices by the P2P connection via the second network, the VPN connection information being required to establish a VPN link in the first network and including at least an encryption method, an encryption key, and a global IP address, and the switching portion starts the confidential communication using the VPN over the first network by a communication method based on the VPN connection information exchanged over the second network.