Electronic key registration system

• US 9,094,382 B2
• Filed: 05/28/2013
• Issued: 07/28/2015
• 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:
  US13/903,233
• Publication Number:
  US 20130332736A1
• Time in Patent Office: 791 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 2009/00492 whereby the code is a rolling code
• CPC Class Codes: G07C 9/00817 where the code of the lock can be programmed
• CPC Class Codes: H04L 2209/80 Wireless
• CPC Class Codes: H04L 2209/84 Vehicles
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• 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

Abstract

An immobilizer ECU transmits a vehicle ID code and a SEED code, which is read from an electronic key, to a data center online. The data center generates an encryption key from the received SEED code and a first logic, and generates a further SEED code from the encryption key, the vehicle ID code, and a second logic. The immobilizer ECU obtains the further SEED code online from the data center, generates the encryption key from the obtained further SEED code, the vehicle ID code, and the second logic, and stores the encryption 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, a first additional electronic key device, and a second additional electronic key device, each storing a unique key ID code and a unique encryption key, wherein each encryption key is used for encrypted communication between the corresponding electronic key device and the vehicle to perform verification; and

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

a first set of instructions configured to store a vehicle ID code in the controller when manufacturing the controller;

a second set of instructions configured to

generate, with the first additional electronic key device, the encryption key of the first additional electronic key device by performing a computation using a first encryption key generation code stored in the first additional electronic key device and a first logic, and

store the generated encryption key in the first additional electronic key device to manufacture the first additional electronic key device;

a third set of instructions configured to

transmit, with the controller to the data center online, the vehicle ID code and the first encryption key generation code that is stored in the first additional electronic key device,

generate, with the data center, the electronic key device encryption key of the first additional electronic key device by performing a computation using the received first encryption key generation code and the first logic,

generate, with the data center, a second encryption key generation code by performing a computation using the generated electronic key device encryption key, the vehicle ID code, and the second logic,

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

generate, with the controller, the encryption key of the first additional electronic key device by performing a computation using the vehicle ID code, the obtained second encryption key generation code, and the second logic, and

store, in the controller, the generated electronic key device encryption key to register the first additional electronic key device;

a fourth set of instructions configured to

store, in the second additional electronic key device, the vehicle ID code corresponding to information indicated on an order sheet, a third encryption key generation code used to generate the encryption key of the second additional electronic key device, the encryption key of the second additional electronic key device generated by performing a computation using the vehicle ID code, the third encryption key generation code, and a second logic to manufacture the second additional electronic key device; and

a fifth set of instructions configured to

read, with the controller, the third encryption key generation code from the second additional electronic key device,

generate, with the controller that is disconnected from the data center, the encryption key of the second additional electronic key device by performing a computation using the third encryption key generation code, the communication ID code stored in the controller, and the second logic, and

store, in the controller that is disconnected from the data center, the encryption key of the second additional electronic key device.

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

instructions configured to

store, in the initial electronic key device, an initial encryption key generation code and the encryption key of the initial electronic key device that is generated by performing a computation using the initial encryption key generation code and a third logic to manufacture the initial electronic key device; and

instructions configured to

obtain, with the controller, the initial encryption key generation code from the initial electronic key device,

generate, with the controller, the encryption key of the initial electronic key device by performing a computation using the initial encryption key generation code and the third logic, and

store, in the controller, the generated encryption key to register the initial electronic key device.

3. The electronic key registration system according to claim 2, wherein the instruction configured to register the initial electronic key device includes writing, to the initial electronic key device, the vehicle ID code stored in the controller.

4. The electronic key registration system according to claim 1, wherein

the second set of instructions include an instruction configured to store the key ID code in the first additional electronic key device,

the third set of instructions include an instruction configured to store the key ID code of the first additional electronic key device in the controller,

the fourth set of instructions include an instruction configured to store the key ID code in the second additional electronic key device, and

the fifth set of instructions includes an instruction configured to store the key ID code of the second additional electronic key device in the controller.

5. The electronic key registration system according to claim 2, wherein

the instruction configured to manufacture the initial electronic key device includes storing the key ID code in the initial electronic key device, and

the instruction configured to register the initial electronic key device includes storing the key ID code of the initial electronic key device in the controller.

6. The electronic key registration system according to claim 2, wherein the third logic is the same as the first logic.

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, the controller storing a vehicle ID code; and

an electronic key device storing an encryption key, wherein the electronic key device is configured to use the 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 and the electronic key device are programmed to

obtain, with the controller, an initial encryption key generation code from the electronic key device,

generate, with the controller, the encryption key of the electronic key device by performing a computation using the initial encryption key generation code and a third logic, and

store, in the controller, the generated encryption key of the electronic key device to register the electronic key device,

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

transmit, with the controller to the data center online, the vehicle ID code and a first encryption key generation code that is stored in the electronic key device,

generate, with the data center, the encryption key of the electronic key device by performing a computation using the received first encryption key generation code and a first logic,

generate, with the data center, a second encryption key generation code by performing a computation using the generated encryption key of the electronic key device, the vehicle ID code, and a second logic,

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

generate, with the controller, the encryption key of the electronic key device by performing a computation using the vehicle ID code, the obtained second encryption key generation code, and the second logic, and

store, in the controller, the generated encryption key of the electronic key device to register the electronic key device,

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

read, with the controller, a third encryption key generation code from the electronic key device,

generate, with the controller that is disconnected from the data center, the encryption key of the electronic key device by performing a computation using the third encryption key generation code, the communication ID code stored in the controller, and the second logic, and

store, in the controller that is disconnected from the data center, the encryption key of the electronic key device to register the electronic key device.