Kabushiki Kaisha Tokai Rika Denki Seisakusho

Tomohiro Ito

Shinichi Koga

Daisuke Kawamura

Hiroaki Iwashita

Yoshiyuki Mizuno

Hideki Kawai

Yuuki Nawa

Hiromitsu Mizuno

Kota Nishida

Masahiro Matsushita

Kouhei Kishimoto

A registration device includes a processor that writes an ID code to an invalid ID code storage region in accordance with management data, updates the management data after the ID code is safely written, and validates the invalid ID code storage region storing the ID code. After the ID code is written, when an ID code is stored in every one of the ID code storage regions, the processor updates the management data to invalidate the ID code storage region excluding the invalid ID code storage region storing the ID code.

Registration device

A secret key registration system which registers a secret key in a portable key device and vehicle. A first transformation equation is stored in a writer and the vehicle. A second transformation equation is stored in the portable key device and the vehicle. The writer transmits a registration code to the portable key device and generates intermediate data with the first transformation equation of the writer. The intermediate data is transmitted to the portable key device, which generates the secret key from the intermediate data with the second transformation equation. The portable key device transmits the registration code to the vehicle. The vehicle generates intermediate data from the registration code with the first transformation equation of the vehicle, and then generates the secret key from the intermediate data with the second transformation equation.

System and method for registering secret key

Growing community of inventors

Aichi, Japan

Tomohiro Ito