Vehicle network system
First Claim
1. A vehicle network system, comprising:
- a plurality of control circuits provided on a vehicle and network-connected to each other communicatively to communicate via a control area network (CAN) protocol format,the plurality of control circuits including;
a first control circuit that has a secret key from among the secret key and a public key that form a pair and are set by execution of initialization processing for activating the system; and
a second control circuit that has the public key, whereina second identifier is allocated to the second control circuit, the second identifier is an identifier is that is added to a communication having the CAN protocol format,the second control circuit is configured to create authentication information from the public key and information specifying the second control circuit, add the authentication information and the second identifier to the communication which is to be transmitted to another control circuit, and transmit the communication with the authentication information added to the first control circuit via the network; and
the first control circuit is configured to acquire the authentication information that has been added to the communication transmitted from the second control circuit and estimate reliability of the communication on the basis of the acquired authentication information and the secret key, the first control circuit broadcasts an indication that the communication from the second control circuit is not authorized when the communication is determined to be unreliable.
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Accused Products
Abstract
In a vehicle network system, a plurality of ECUs are network-connected. The plurality of ECUs include a first ECU that has set therein a secret key from among the secret key and a public key that form a pair and are set on the basis of initialization processing performed when the vehicle network system is created, and a second ECU that has set therein the public key. The second ECU adds, to a transmission signal, an authentication keyword created from the public key and information capable of specifying the second ECU and transmits the transmission signal with the authentication keyword added thereto to the network. The first ECU acquires the authentication keyword and estimates the reliability of the communication signal on the basis of the acquired authentication keyword and the secret key.
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Citations
12 Claims
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1. A vehicle network system, comprising:
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a plurality of control circuits provided on a vehicle and network-connected to each other communicatively to communicate via a control area network (CAN) protocol format, the plurality of control circuits including; a first control circuit that has a secret key from among the secret key and a public key that form a pair and are set by execution of initialization processing for activating the system; and a second control circuit that has the public key, wherein a second identifier is allocated to the second control circuit, the second identifier is an identifier is that is added to a communication having the CAN protocol format, the second control circuit is configured to create authentication information from the public key and information specifying the second control circuit, add the authentication information and the second identifier to the communication which is to be transmitted to another control circuit, and transmit the communication with the authentication information added to the first control circuit via the network; and the first control circuit is configured to acquire the authentication information that has been added to the communication transmitted from the second control circuit and estimate reliability of the communication on the basis of the acquired authentication information and the secret key, the first control circuit broadcasts an indication that the communication from the second control circuit is not authorized when the communication is determined to be unreliable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vehicle network system, comprising:
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a plurality of control circuits provided on a vehicle and network-connected to each other communicatively to communicate via a control area network (CAN) protocol format, the plurality of control circuits including; a first control circuit that has a secret key from among the secret key and a public key that form a pair and are set by execution of initialization processing for activating the system; and a second control circuit that has the public key, wherein a first identifier is allocated to the first control circuit and a second identifier is allocated to the second control circuit, the first identifier and the second identifier are identifiers that are added to a communication having the CAN protocol format, the first identifier and the second identifiers are different from each other, and the second identifier is associated with the first identifier; the first control circuit is configured to transmit the communication, to which the first identifier is added, to another control circuit via the network and also transmit an authentication communication, to which the second identifier is added, created on the basis of the secret key and original authentication data generated on the basis of the communication; and the second control circuit is configured to receive the communication and the authentication communication and estimate reliability of the communication, based on the added second identifier and the added first identifier, on the basis of comparison of reproduced authentication data generated on the basis of the received communication and decoded authentication data decoded on the basis of the authentication communication and the public key, the second control circuit broadcasts an indication that the communication from the first control circuit is not authorized when the communication is determined to be unreliable. - View Dependent Claims (10, 11, 12)
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Specification