Patterson Thuente Christensen Pedersen, P.A.
System and method for registering secret key
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.
Kabushiki Kaisha Tokai Rika Denki Seisakusho
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Yoshiyuki Hiroaki Yuuki Hideki Kouhei Daisuke Hiromitsu Tomohiro Kota Shinichi
Mizuno Iwashita Nawa Kawai Kishimoto Kawamura Mizuno Ito Nishida Koga