Tachograph, toll onboard unit, display instrument, and system
First Claim
1. A system comprising:
- a vehicle data bus;
a tachograph having a first data interface configured as a first vehicle data bus interface coupleable to the vehicle data bus;
a toll onboard unit having a second data interface configured as a second vehicle data bus interface coupleable to the vehicle data bus, the toll onboard unit and the tachograph configured as communication partners for data communication; and
a connecting unit configured to translate the data communication between the communication partners,at least one of the tachograph and the toll onboard unit is configured as a data transmitter configured to;
determine a shortened cryptographic check value based at least in part on payload data transmitted via the data interface to the respective communication partner, andtransmit separately the payload data and the cryptographic check value associated with the payload data to the respective communication partner in respective separate messages; and
at least one of the toll onboard unit and the tachograph is configured as a data receiver to;
receive the separate messages including, respectively, the payload data and the associated cryptographic check value via the data interface from the respective communication partner in a retained layout, andcheck the received payload data for corruption based at least in part on the received cryptographic check value,whereby only the cryptographic check value transmitted in the respective separate message is required for secure transmission of the payload data,wherein all communication partners of the tachograph are configured to authenticate themselves to the tachograph, andwherein the tachograph is configured to produce at least one cryptographic key and to encryptedly transmit the at least one cryptographic key that is produced to only those communication partners of the tachograph that have previously authenticated themselves to the tachograph.
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Accused Products
Abstract
A tachograph and a toll onboard unit as communication partners, which each have a data interface for a data communication via a vehicle data bus to which the communication partners are coupled. The tachograph and/or the toll onboard unit are implemented as a transmitter of data to ascertain a cryptographic check value as a function of user data, which are to be transmitted to the communication partner, and to transmit the cryptographic check value in addition to the user data to the communication partner. The toll onboard unit or the tachograph, respectively, as a receiver of data, is implemented to receive user data and the cryptographic check value associated with the user data from the communication partner and to check the received user data for corruption as a function of the received cryptographic check value.
16 Citations
23 Claims
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1. A system comprising:
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a vehicle data bus; a tachograph having a first data interface configured as a first vehicle data bus interface coupleable to the vehicle data bus; a toll onboard unit having a second data interface configured as a second vehicle data bus interface coupleable to the vehicle data bus, the toll onboard unit and the tachograph configured as communication partners for data communication; and a connecting unit configured to translate the data communication between the communication partners, at least one of the tachograph and the toll onboard unit is configured as a data transmitter configured to; determine a shortened cryptographic check value based at least in part on payload data transmitted via the data interface to the respective communication partner, and transmit separately the payload data and the cryptographic check value associated with the payload data to the respective communication partner in respective separate messages; and at least one of the toll onboard unit and the tachograph is configured as a data receiver to; receive the separate messages including, respectively, the payload data and the associated cryptographic check value via the data interface from the respective communication partner in a retained layout, and check the received payload data for corruption based at least in part on the received cryptographic check value, whereby only the cryptographic check value transmitted in the respective separate message is required for secure transmission of the payload data, wherein all communication partners of the tachograph are configured to authenticate themselves to the tachograph, and wherein the tachograph is configured to produce at least one cryptographic key and to encryptedly transmit the at least one cryptographic key that is produced to only those communication partners of the tachograph that have previously authenticated themselves to the tachograph. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A tachograph, comprising
a data interface configured as a vehicle data bus interface, such that data communication takes place with one or more communication partners via a vehicle data bus, to which the tachograph and the respective one or more communication partners are coupled, the tachograph being configured to: -
receive authentication from the one or more communication partners of the tachograph, produce at least one cryptographic key and to encryptedly transmit the at least one cryptographic key that is produced to only those of the one or more communication partners that have previously authenticated themselves to the tachograph, determine a cryptographic check value as a function of payload data, for transmission via the data interface to the respective at least one communication partner, and to transmit separately the payload data and the cryptographic check value associated with the payload data to the respective communication partner in respective separate messages, and receive the respective separate messages containing the payload data and the associated cryptographic check value via the data interface in a retained layout, from the respective at least one communication partner, and to check the received payload data for corruption, based at least in part on the received cryptographic check value, whereby only the cryptographic check value in the respective separate message is required for secure reception of the payload data.
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Specification