TACHOGRAPH, TOLL-ON-BOARD UNIT, INDICATOR DEVICE AND SYSTEM Russian patent published in 2014 - IPC G07C5/08 

FIELD: physics, computer engineering.

SUBSTANCE: invention relates to a tachograph, particularly a digital, toll-on-board unit, an indicator device and a system comprising same, particularly for cars. The system comprises a tachograph (DTCO) and a toll-on-board-unit (OBU) as a communication subscriber, each of which comprises a data interface (DS) for data communication via a vehicle data bus (FDB) by which the communication subscriber can be connected. The tachograph (DTCO) and the toll-on-board unit (OBU) are as transmitters of data designed to determine a cryptographic check value depending on payload data to be transmitted to the communication subscriber, and send the cryptographic check value in addition to the payload data to the communication subscriber. The toll-on-board unit (OBU) and the tachograph (DTCO) as respective receivers of data are configured to receive from the communication subscriber payload data and the cryptographic check value associated with the payload data and for checking the received payload data for distortions depending on the cryptographic check value received.

EFFECT: high reliability of data communication.

25 cl, 9 dwg