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Communication system, relay device and communication method

A technology of a relay device and a communication device, applied in the field of communication systems

Active Publication Date: 2021-07-20
AUTONETWORKS TECH LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the method using the MAC, it is ineffective against the retransmission attack that obtains the normal message sent and received on the network in the past and retransmits the obtained message.

Method used

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  • Communication system, relay device and communication method
  • Communication system, relay device and communication method
  • Communication system, relay device and communication method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0054] figure 1 It is a block diagram showing the structure of the communication system of Embodiment 1. The communication system of the present embodiment is a system in which a plurality of ECUs (Electronic Control Units) 2 mounted on a vehicle 1 communicate with each other via communication lines 1 a and 1 b and a gateway 4 arranged in the vehicle 1 . In the communication system of this embodiment, the gateway 4 corresponds to a relay device, and the ECU 2 corresponds to a communication device. Furthermore, in the illustrated example, two ECUs 2 are connected to the communication line 1a in the vehicle, three ECUs 2 are connected to the communication line 1b, and the two communication lines 1a, 1b are connected to the gateway 4. The gateway 4 relays the communication between the communication lines 1 a and 1 b so that all the ECUs 2 can transmit and receive data with other ECUs 2 .

[0055] The ECU 2 may include, for example, an ECU that controls the operation of the engi...

Embodiment approach 2

[0114] The communication system according to Embodiment 2 has a configuration in which a plurality of communication protocols are mixed and a plurality of relay devices are connected in a hierarchical manner. Figure 14 It is a block diagram showing the structure of the communication system of Embodiment 2. The communication system according to Embodiment 2 is configured by including a plurality of DCUs (Domain Control Units) 200 to 204 as relay devices and a plurality of ECUs 203a to 203l as communication devices. The communication system according to Embodiment 2 includes a network that communicates at a communication speed of 1 Gbps according to a communication protocol of Ethernet (registered trademark), a network that performs communication at a communication speed of 100 Mbps according to a communication protocol of Ethernet (registered trademark), A network that communicates at a communication speed of 2 Mbps in accordance with the CAN-FD communication protocol.

[011...

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PUM

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Abstract

Provided are a communication system, a relay device, a communication device, and a communication method capable of transmitting and receiving messages using shared information whose value can vary. The relay device relays communications between a plurality of communication lines to which one or more communication devices are connected. The communication device and the relay device store shared information, generate a message using the shared information, transmit the generated message to other devices, receive messages from other devices, and determine whether the received message is correct based on the shared information. At least one of the communication device and the relay device transmits an update command for updating the shared information to the other device. The communication device and the relay device update the stored shared information when an update command is received. When the communication device or the relay device receives a message generated using the shared information before the update until a predetermined period of time elapses from the update of the shared information, it determines that the message is an authentic message.

Description

technical field [0001] The present invention relates to a communication system in which a relay device relays communication between a plurality of communication lines, a relay device, a communication device, and a communication method. Background technique [0002] In recent years, in a network mounted on a vehicle, for example, as a countermeasure for preventing illegal message transmission to the network from being connected by an illegal communication device or taking over by a legitimate communication device, etc., a usage report has been proposed. A scheme for sending and receiving messages of MAC (Message Authentication Code). However, MAC is generated based on a key shared by authorized communication devices and transmitted information, and has the same value when combinations of the key and transmitted information are the same. Therefore, the method using the MAC is ineffective against retransmission attacks that acquire regular messages transmitted and received on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/46H04L9/16H04L29/06
CPCH04L9/16H04L12/28H04L12/46H04L2012/40215H04L2012/40273H04L12/40H04L12/66H04L63/123H04L67/12H04L9/32H04L9/3236H04L67/568
Inventor 水谷友洋
Owner AUTONETWORKS TECH LTD