The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 2013
Filed:
Jan. 07, 2009
Detlef Böhler, Reichenau, DE;
Thomas Grill, Villingen-Schwenningen, DE;
Erwin Hess, Ottobrunn, DE;
Bernd Meyer, München, DE;
Horst Plankenhorn, Villingen-Schwenningen, DE;
Detlef Böhler, Reichenau, DE;
Thomas Grill, Villingen-Schwenningen, DE;
Erwin Hess, Ottobrunn, DE;
Bernd Meyer, München, DE;
Horst Plankenhorn, Villingen-Schwenningen, DE;
Continental Automotive GmbH, Hannover, DE;
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).