Patent ID: 8484475
Filing Date: 2013-07-09
Classification: G01P,H04L

Abstract:
1. A data transmission method for a tachograph system for transmission of digital messages between a velocity transmitter and a recording unit each having a respective key pair with a public key and a private key and a certificate derived from the respective key pair, the method comprising: transmitting the velocity transmitter public key and the velocity transmitter certificate from the velocity transmitter to the recording unit; transmitting the recording unit public key and the recording unit certificate from the recording unit to the velocity transmitter; checking the velocity transmitter public key and the velocity transmitter certificate by the recording unit; checking the recording unit public key and the recording unit certificate by the velocity transmitter; capturing sensor data by the velocity transmitter; producing a digital message by the velocity transmitter from the sensor data; producing authentication information item for the digital message by the velocity transmitter based on its key pair; transmitting the message and the authentication information item from the velocity transmitter to the recording unit; and processing the message in the recording unit based a validity of the authentication information item as checked by the recording unit.