Method and device for transmitting messages in real time

Abstract

A method and a system for transmitting a message in real time between subscribers in a closed network of a vehicle (1), in particular a rail-bound vehicle, is provided. To this end, an encryption (S1) of security-relevant real-time data (D) of a message (N), including a transmitter ID of a transmitter (3) inside the closed network, is performed using a private key (KprivA) of the transmitter (3) to generate an encrypted message (N'); a transmission (S2) of the encrypted message (N') together with the unencrypted transmitter ID of the transmitter (3) from the transmitter (3) is performed via a vehicle bus (2) to a receiver (4) within the closed network, and a decryption of the encrypted message (N') is performed by the receiver (4) using a public key (KpublicA) of the transmitter (3), which is identified by the received unencrypted transmitter ID, to reacquire the unencrypted message (N). The received transmitter ID is compared to the transmitter ID, which is contained in the required message (N), in order to establish whether the transmission of the message (N) has been performed correctly.

Description

technical field [0001] The invention relates to a method and a device for transmission between users in a closed network of vehicles. Background technique [0002] When data transmission is carried out in a closed network, especially in applications where safety is important, data delay, data replacement, data loss and data forgery must be avoided or excluded. It is also necessary to ensure that the data is being transmitted correctly to the correct receiver. Vehicles, in particular rail vehicles, have many components or components, such as brake control, drive control, sanitary or air-conditioning control, which are connected via a vehicle bus to a server or central control. Each of these components or devices sends and receives data. These components are interconnected, for example, via an Ethernet bus. Especially in real-time safety-critical applications, such as when actuating the brakes of a train, the data transmitted via the vehicle bus cannot be falsified. Falsif...

AI Technical Summary

Problems solved by technology

In the case of data falsification in conventional systems, it cannot be verified whether the data falsification was caused by an internal fault or by a systemic fault in which another communication partner sent and sometimes falsified the received message

Conventional systems do not provide adequate protection, especially against wanton hacking

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