Data transmission method, and tachograph system

US8484475B2 · kind B2 · utility

Assignee

• CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

• Detlef Böhler · Reichenau, DE
• Thomas Grill · Villingen-Schwenningen, DE
• Erwin Hess · Ottobrunn, DE
• Bernd Meyer · Munich, DE
• Horst Plankenhorn · Villingen-Schwenningen, DE

Key dates

• Filing date: Jan 7, 2009
• Grant date: Jul 9, 2013
• Expiry date: Feb 25, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L2209/84
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

In a data transmission method for a tachograph system, digital messages are transmitted between a speed transmitter (MS) and a recording unit (RU). The digital messages contain a pair of keys including a public key (KMP, KRP) and a private key (KMS, KRS), as well as a certificate (ZM, ZR) derived from the respective pair of keys. The public keys (KMP, KRP) and the certificates (ZM, ZR) are mutually verified between the recording unit (RU) and the speed transmitter (MS). If the verification is positive, the speed transmitter (MS) detects sensor data, and a digital message is generated therefrom. In addition, the speed transmitter (MS) generates authentication data for the message in accordance with the pair of keys (KMP, KMS) thereof. The message and the authentication data are transmitted to the recording unit and are processed there in accordance with a validity of the authentication data verified by the recording unit (RU).