Abstract: An electronic key registration system includes an electronic key device that stores a key ID and a first piece of information. A controller is arranged in a communication subject. A registration tool writes the key ID to the controller and stores a second piece of information. Encrypted communication between the communication subject and the electronic key device is enabled after the key ID and a corresponding encryption key are written to the controller. An information center, which communicates with the registration tool, receives and compares the first and second pieces of information. The registration tool is permitted to write the key ID when receiving a signal from the information center indicating that the first and second pieces of information conform to each other.

Abstract: An electronic key registration system includes an electronic key device having a key ID. A controller having a first piece of information is arranged in a communication subject. A registration tool having a second piece of information is configured to write the key ID to the controller. The controller compares, before electronic key registration, the first piece of information and the second piece of information. The controller permits electronic key registration when the comparison indicates that the first piece of information and the second piece of information conform to each other and prohibits the electronic key registration when the comparison indicates that the first piece of information and the second piece of information do not conform to each other.

Abstract: A method for registering first and second electronic keys to a controller of a communication subject through communication with a data center includes acquiring first and second key identification information from the first and second electronic keys with the controller, transmitting communication subject identification information together with both of the first and second key identification information from the controller to the data center, acquiring a first encryption key generation code corresponding to the first electronic key together with a second encryption key generation code corresponding to the second electronic key from the data center with the controller, generating a first key encryption key based on the first encryption key generation code with the controller, generating a second key encryption key based on the second encryption key generation code with the controller, and storing the first and second key encryption keys in the controller.

Abstract: A method for registering first and second electronic keys to a controller of a communication subject through communication with a data center includes acquiring first and second key identification information from the first and second electronic keys with the controller, transmitting communication subject identification information together with both of the first and second key identification information from the controller to the data center, acquiring a first encryption key generation code corresponding to the first electronic key together with a second encryption key generation code corresponding to the second electronic key from the data center with the controller, generating a first key encryption key based on the first encryption key generation code with the controller, generating a second key encryption key based on the second encryption key generation code with the controller, and storing the first and second key encryption keys in the controller.

Abstract: An electronic key registration system includes an electronic key device having a key ID. A controller having a first piece of information is arranged in a communication subject. A registration tool having a second piece of information is configured to write the key ID to the controller. The controller compares, before electronic key registration, the first piece of information and the second piece of information. The controller permits electronic key registration when the comparison indicates that the first piece of information and the second piece of information conform to each other and prohibits the electronic key registration when the comparison indicates that the first piece of information and the second piece of information do not conform to each other.

Abstract: An electronic key registration system includes an electronic key device that stores a key ID and a first piece of information. A controller is arranged in a communication subject. A registration tool writes the key ID to the controller and stores a second piece of information. Encrypted communication between the communication subject and the electronic key device is enabled after the key ID and a corresponding encryption key are written to the controller. An information center, which communicates with the registration tool, receives and compares the first and second pieces of information. The registration tool is permitted to write the key ID when receiving a signal from the information center indicating that the first and second pieces of information conform to each other.