Electronic key registration system

• US 9,137,658 B2
• Filed: 05/28/2013
• Issued: 09/15/2015
• Est. Priority Date: 06/06/2012
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Original Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Inventors: Kawamura, Daisuke, Iwashita, Hiroaki, Hayashi, Masaki, Nagae, Toshihiro, Kato, Hisashi, Egawa, Tetsuya
• Primary Examiner(s): Truong, Thanhnga B
• Assistant Examiner(s): Naghdali, Khalil
• Application Number:
  US13/903,342
• Publication Number:
  US 20130329890A1
• Time in Patent Office: 840 Days
• Field of Search: 713/150
• US Class Current: 1/1
• CPC Class Codes: B60R 25/24 using electronic identifiers containing a code not memorised by the user
• CPC Class Codes: G07C 2009/00388 code verification carried out according to the challenge/response method
• CPC Class Codes: G07C 2009/00412 the transmitted data signal being encrypted
• CPC Class Codes: H04L 2209/80 Wireless
• CPC Class Codes: H04L 2209/84 Vehicles
• CPC Class Codes: H04L 9/0816 Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
• CPC Class Codes: H04L 9/0869 involving random numbers or seeds
• CPC Class Codes: H04L 9/3271 using challenge-response
• CPC Class Codes: H04W 12/041 Key generation or derivation

Abstract

An offline immobilizer ECU reads an encryption key generation code from an offline additional electronic key and generates an electronic key encryption key for the offline additional electronic key using the encryption key generation code and a communication subject key encryption key held by the immobilizer ECU. The immobilizer ECU stores, in a memory, the generated electronic key encryption key and a key ID code that is read from the offline additional electronic key.

Claims

1. An electronic key registration system that registers an electronic key device to a vehicle, the electronic key registration system comprising:

a controller arranged in the vehicle and capable of accessing a data center through at least a network;

an initial electronic key device, an online additional electronic key device, and an offline additional electronic key device, each storing a unique key ID code and a unique encryption key, wherein each of the electronic key devices is configured to use the corresponding electronic key device encryption key when performing a wireless verification communication with the controller of the vehicle; and

a computer-readable medium having instructions stored thereon that include;

a first set of instructions configured to store, in the controller, a unique vehicle ID code and a vehicle encryption key that is used for the registration, and store, in the data center, the vehicle ID code and the vehicle encryption key that are stored in the controller;

a second set of instructions configured to store, in the online additional electronic key device, the key ID code and the electronic key device encryption key corresponding to the online additional electronic key device;

a third set of instructions configured to store, in the data center, the key ID code and the electronic key device encryption key that are stored in the online additional electronic key device;

a fourth set of instructions configured to transmit, from the controller online to the data center, the vehicle ID code and the key ID code of the online additional electronic key device;

a fifth set of instructions configured to generate, with the data center, an encryption key generation code using the vehicle encryption key corresponding to the vehicle ID code and the electronic key device encryption key corresponding to the key ID code of the online additional electronic key device that are stored in the data center;

a sixth set of instructions configured to obtain the encryption key generation code from the data center with the controller online, generate the electronic key device encryption key of the online additional electronic key device from the obtained encryption key generation code with the controller online, and store the electronic key device encryption key of the online additional electronic key device in the controller;

a seventh set of instructions configured to store, in the offline additional electronic key device, the electronic key device encryption key corresponding to the key ID code of the offline additional electronic key device, and store, in the offline additional electronic key device, an encryption key generation code generated using the vehicle encryption key corresponding to the vehicle ID code that is in correspondence with information indicated on an order sheet and the stored electronic key device encryption key;

an eighth set of instructions configured to obtain, with the data center, the electronic key device encryption key and the key ID code that are stored in the offline additional electronic key device, and store, in the data center, the electronic key device encryption key and the key ID code in association with the vehicle ID code; and

a ninth set of instructions configured to read, when the controller is not able to communicate with the data center through at least the network, the encryption key generation code from the offline additional electronic key device, generate an electronic key device encryption key for the offline additional electronic key device using the vehicle key encryption key stored in the controller, and store, in the controller, the generated electronic key device encryption key and the key ID code read from the offline additional electronic key device.

2. The electronic key registration system according to claim 1, the instructions of the computer-readable medium further includes:

an initial electronic key device manufacturing instruction configured to

store, in the initial electronic key device, the key ID code and the electronic key device encryption key of the initial electronic key device,

store, in the initial electronic key device, the encryption key generation code generated with the electronic key device encryption key that is stored in the initial electronic key device and a key generation logic, and

store, in the data center, the key ID code and the electronic key device encryption key that are stored in the initial electronic key device; and

an initial registration instruction configured to

generate, with the controller, the electronic key device encryption key for the initial electronic key device using the encryption key generation code that is obtained from the initial electronic key device and a key generation logic,

store, in the controller, the generated electronic key device encryption key, and

store, in the data center, the key ID code of the initial electronic key device stored in the controller and the vehicle ID code in association with each other.

3. The electronic key registration system according to claim 2, wherein the initial registration instruction includes an instruction for deleting the encryption key generation code from the initial electronic key device when the electronic key device encryption key of the initial electronic key device is stored in the controller.

4. The electronic key registration system according to claim 2, wherein the initial registration instruction includes an instruction for writing the electronic key device ID code read by the controller from the initial electronic key device to the controller.

5. The electronic key registration system according to claim 1, the instructions of the computer-readable medium further includes:

an initial electronic key device manufacturing instruction configured to

store, in the initial electronic key device, the key ID code and the electronic key device encryption key of the initial electronic key device, and

store, in the data center, the electronic key device ID code and the electronic key device encryption key that are stored in the initial electronic key device; and

an initial registration instruction configured to

transmit, from the controller to the data center, the vehicle ID code and the electronic key device ID code that is read from the initial electronic key device,

generate, with the data center, an encryption key generation code generated from the electronic key device encryption key associated with the electronic key device ID code of the initial electronic key device using the vehicle encryption key associated with the vehicle ID code stored in the data center,

obtain, with the controller, the generated encryption key generation code from the data center,

generate, with the controller, the electronic key device encryption key for the initial electronic key device from the obtained encryption key generation code, and

store, in the controller, the generated electronic key device encryption key.

6. The electronic key registration system according to claim 1, further comprising an online replacement controller and an offline replacement controller that replace the controller, wherein the instructions of the computer-readable medium further includes:

an online replacement controller manufacturing instruction configured to

store, in the online replacement controller, a unique vehicle ID code and a vehicle encryption key, and

then store, in the data center with the online replacement controller, the vehicle ID code and the vehicle encryption key that are stored in the online replacement controller,

an online replacement controller registration instruction configured to

obtain, with the data center, the electronic key device ID code of at least one of the electronic key devices,

generate, with the data center, an encryption key generation code for the at least one of the electronic key devices using the electronic key device encryption key that corresponds to the obtained electronic key device ID code and is stored in the data center and the vehicle encryption key of the online replacement controller that is stored in the data center,

obtain, with the online replacement controller, the generated encryption key generation code from the data center,

generate, with the online replacement controller, an electronic key device encryption key for the at least one of the electronic key devices from the obtained encryption key generation code, and

store, in the online replacement controller, the generated electronic key device encryption key;

an offline replacement controller manufacturing instruction configured to

obtain, with the offline replacement controller from the data center, the vehicle ID code that is stored in the data center in association the vehicle indicated on an order sheet and an electronic key device ID code and an electronic key device encryption key of every one of the electronic key devices stored in the data center in association with the vehicle ID code, and

store, in the offline replacement controller, the vehicle ID code and the electronic key device ID code and the electronic key device encryption of every one of the electronic key devices; and

an offline replacement controller registration instruction configured to

obtain, with the offline replacement controller, the electronic key device ID code of at least one of the electronic key devices, and

register, with the offline replacement controller, the at least one of the electronic key devices when the obtained key ID code is the same as at least one of the key ID codes stored in the offline replacement controller.

7. An electronic key registration system, comprising:

a registration tool that outputs a registration signal for requesting for registering an electronic key device to a vehicle;

a controller arranged in the vehicle and capable of accessing a data center through at least a network; and

an electronic key device, storing a unique key ID code and a unique encryption key, wherein the electronic key device is configured to use the electronic key device encryption key when performing a wireless verification communication with the controller of the vehicle,

wherein the registration tool, the controller, the electronic key device, and the data center include one or more computer-readable media having instructions stored thereon,

wherein the controller is configured to receive the registration signal from the registration tool and to determine whether the received registration signal is an initial registration signal or an additional registration signal,

wherein when the registration signal is an initial registration signal, the controller, the electronic key device and the data center are programmed to store, in the controller, a unique vehicle ID code and a vehicle encryption key that is used for the registration, and store, in the data center, the vehicle ID code and the vehicle encryption key that are stored in the controller, and

wherein when the controller is able to communicate with the data center through at least the network and the registration signal is an additional registration signal, the controller, the electronic key device and the data center are programmed to;

store, in the electronic key device, the key ID code and the electronic key device encryption key corresponding to the electronic key device;

store, in the data center, the key ID code and the electronic key device encryption key that are stored in the electronic key device;

transmit, from the controller online to the data center, the vehicle ID code and the key ID code of the electronic key device;

generate, with the data center, an encryption key generation code using the vehicle encryption key corresponding to the vehicle ID code and the electronic key device encryption key corresponding to the key ID code of the electronic key device that are stored in the data center; and

obtain the encryption key generation code from the data center with the controller online, generate the electronic key device encryption key of the electronic key device from the obtained encryption key generation code with the controller online, and store the electronic key device encryption key of the electronic key device in the controller;

wherein when the controller is not able to communicate with the data center through at least the network and the registration signal is an additional registration signal, the controller, the electronic key device and the data center are programmed to;

store, in the electronic key device, the electronic key device encryption key corresponding to the key ID code of the electronic key device, and store, in the electronic key device, an encryption key generation code generated using the vehicle encryption key corresponding to the vehicle ID code that is in correspondence with information indicated on an order sheet and the stored electronic key device encryption key;

obtain, with the data center, the electronic key device encryption key and the key ID code that are stored in the electronic key device, and store, in the data center, the electronic key device encryption key and the key ID code in association with the vehicle ID code; and

read, when the controller is not able to communicate with the data center through at least the network, the encryption key generation code from the electronic key device, generate an electronic key device encryption key for the electronic key device using the vehicle key encryption key stored in the controller, and store, in the controller, the generated electronic key device encryption key and the key ID code read from the electronic key device.