Sensor Data Authentication via Segmented MAC Transmission

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Solution Overview

Problem

Existing data transmission methods do not efficiently verify the authenticity and integrity of data values while minimizing bandwidth usage and interference.

Innovation Solution

A method and apparatus that distribute a portion of authentication and integrity information with data values, using a message authentication code like CMAC, to ensure low interference and efficient verification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If authentication information is transmitted with each data value, then verification of authenticity and integrity is improved, but bandwidth usage increases and interference occurs

Engineering Contradiction:

Improveverification of authenticity and integrityVSAvoidbandwidth usage

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The authentication information (MAC) is segmented into multiple portions, with each portion transmitted with a corresponding data value. This segmentation allows the authentication data to be distributed across multiple transmissions rather than requiring dedicated bandwidth for the entire MAC, thereby reducing interference while maintaining verification capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines the data value and a portion of the authentication information into a single transmission unit. This merging eliminates the need for separate transmission channels for authentication data, optimizing bandwidth usage by utilizing the existing data transmission path for both data and authentication information.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If authentication information is transmitted with each data value, then verification of authenticity and integrity is improved, but interference in data transmission occurs

Engineering Contradiction:

Improveverification of authenticity and integrityVSAvoidinterference in data transmission

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

By dividing the MAC into multiple smaller portions and distributing them across different data transmissions, the patent reduces the concentration of authentication overhead in any single transmission. This segmentation minimizes the interference impact on individual data values while ensuring that the complete authentication information is eventually available for verification.

Inventive Principle:

Principle #1Segmentation

3Reliability

If a large MAC is used for authentication, then security is improved, but bandwidth usage increases

Engineering Contradiction:

ImprovesecurityVSAvoidbandwidth usage

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent segments a large MAC (128 bits or more) into multiple smaller portions that are distributed across multiple data transmissions. This approach maintains the security strength of the large MAC while reducing the bandwidth impact by spreading the authentication overhead across multiple smaller transmissions rather than transmitting the entire MAC at once.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12621122B2Method and apparatus for transmitting data associated with a data source

Publication Date: 2026.05.05 ROBERT BOSCH GMBH

AI summary

A method of transmitting data associated with a data source, for example a sensor device, for example for a motor vehicle, includes determining first information that enables a verification of authenticity and/or integrity of at least one data value available from the data source, and transmitting a plurality of data values to at least one further unit. At least some data values of the plurality of data values are transmitted together with one, e.g., respective, portion of the first information.