An in-vehicle apparatus is an in-vehicle apparatus installed in a vehicle and configured to perform communication with at least one in-vehicle device connected to an in-vehicle network of the vehicle, the in-vehicle apparatus including a control unit configured to perform control related to the communication, wherein the control unit acquires a sending time point and a reception time point of communication data sent and received during the communication with the in-vehicle device, and determines whether or not the in-vehicle device that has performed the communication is an unauthorized device based on the acquired sending time point and reception time point.

An in-vehicle apparatus is an in-vehicle apparatus installed in a vehicle and configured to perform communication with at least one in-vehicle device connected to an in-vehicle network of the vehicle, the in-vehicle apparatus including a control unit configured to perform control related to the communication, wherein the control unit acquires a sending time point and a reception time point of communication data sent and received during the communication with the in-vehicle device, and determines whether or not the in-vehicle device that has performed the communication is an unauthorized device based on the acquired sending time point and reception time point.

A dual-mode communication device adapted for communication over a public network, wherein the dual-mode communication device is adapted to be operated in a normal mode and in an obfuscated mode. The dual-mode communication device includes a processor and a network interface device. The processor develops a frame from a payload received by the dual-communication device and, if the dual-mode communication device is operating in the obfuscated mode, an obfuscated frame from the frame. The frame and the obfuscated frame comprise a preamble that conforms with protocols associated with the public network and the processor. A network interface transmits one of the frame or the obfuscated frame using the public network. The payload may be extracted from the frame by any receiving device operating in the normal mode in the public network and the payload may be extracted from the obfuscated frame only by another communication device also operating in the obfuscated mode in the public network.

A dual-mode communication device adapted for communication over a public network, wherein the dual-mode communication device is adapted to be operated in a normal mode and in an obfuscated mode. The dual-mode communication device includes a processor and a network interface device. The processor develops a frame from a payload received by the dual-communication device and, if the dual-mode communication device is operating in the obfuscated mode, an obfuscated frame from the frame. The frame and the obfuscated frame comprise a preamble that conforms with protocols associated with the public network and the processor. A network interface transmits one of the frame or the obfuscated frame using the public network. The payload may be extracted from the frame by any receiving device operating in the normal mode in the public network and the payload may be extracted from the obfuscated frame only by another communication device also operating in the obfuscated mode in the public network.

A base collaboration system of the invention that accesses a second base different from a first base from the first base where a first computer and a second computer are disposed, and acquires published data of the second base, in which an arrival route to reach the published data is set by the first computer, where a device on the arrival route is permitted to communicate with the published data, and the published data is accessed by the second computer, in which a server in the first base has an area where the published data is stored, where the second computer copies the published data to the area or refers to the published data, and in which communication between a base other than the first base and the area is prohibited by the first computer.

A base collaboration system of the invention that accesses a second base different from a first base from the first base where a first computer and a second computer are disposed, and acquires published data of the second base, in which an arrival route to reach the published data is set by the first computer, where a device on the arrival route is permitted to communicate with the published data, and the published data is accessed by the second computer, in which a server in the first base has an area where the published data is stored, where the second computer copies the published data to the area or refers to the published data, and in which communication between a base other than the first base and the area is prohibited by the first computer.