Vehicle security device with electronic use authorization coding

US5774550A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Horst Brinkmeyer · Waiblingen, DE
• Michael Daiss · Echterdingen, DE
• Gunter Schwegler · Waiblingen, DE
• Bertolt Kruger · Bonn, DE

Key dates

• Filing date: Jun 26, 1997
• Grant date: Jun 30, 1998
• Expiry date: Jun 26, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C2009/00785
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The invention provides a vehicle security device with an electronic use-authorization coding arrangement for preventing unauthorized access to the vehicle. The vehicle security device utilizes digital signature algorithm for encrypting and transmitting authorization and synchronization information, so that the storage of secret information is essential only at the key unit in order to transmit authorization and/or synchronizing information from the key unit to the vehicle unit in a way which is very effectively protected against falsification. Thus, reading out vehicle unit information does not permit unauthorized manufacture of a copied key.