Combined Authentication for Vehicle Data Bus Latency
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Solution Overview
Problem
In vehicle data buses, the need to ensure both safety and security through end-to-end protection results in high latency and bus load, particularly in fast control loops, where frequent authentication of data packets increases data traffic and processing latency.
Innovation Solution
A transmitting unit generates and transmits combined authentication information for a predefined number or time period of data packets, reducing the need for individual authentication with each packet and allowing continuous data transmission, thereby decreasing latency and bus load by transmitting this information separately and only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual authentication information is transmitted with each data packet, then authentication and security are ensured, but bus load and latency increase significantly
Solution Approach 1:
The patent combines authentication information for multiple data packets into a single combined authentication information item. This merging approach allows the transmitting unit to transmit authentication data less frequently, reducing bus load and latency while maintaining security for the batch of packets. The combined authentication information covers a predefined number or time period of data packets, resolving the contradiction between continuous authentication and reduced transmission overhead.
2Reliability
If authentication information is transmitted with each data packet, then security is maintained, but bus load increases
Solution Approach 1:
The patent merges multiple individual authentication information items into a single combined authentication information item that covers a predefined number or time period of data packets. This reduces the quantity of authentication data transmitted over the bus, lowering overall data traffic while maintaining security coverage for all packets in the batch.
Solution Approach 2:
Instead of continuous transmission of authentication information with every packet, the system uses periodic transmission of combined authentication information for predefined batches or time periods. This periodic action reduces the frequency of authentication data transmission, thereby reducing bus load while maintaining security through regular authentication cycles.
3Loss of time
If data packets are transmitted continuously without waiting for authentication, then latency is reduced, but security verification is delayed
Solution Approach 1:
The transmitting unit generates combined authentication information in advance for a predefined number or time period of data packets, independent of when the packets are actually transmitted. This preliminary generation allows the authentication information to be ready before data transmission begins, enabling continuous data flow without waiting for authentication while ensuring security verification is performed beforehand.
Data Source
AI summary
A transmitting unit for transmitting data packets which contain useful information and corresponding receiving unit. The transmitting unit is configured to transmit multiple data packets successively. The transmitting unit is configured to generate and transmit a data packet with combined authentication information for a predefined number of transmitted data packets or for data packets which are transmitted in a predefined time period. The combined authentication information provides an authentication of the data packets of the predefined number of transmitted data packets or of the data packets that are transmitted in a predefined time period.