Bus Data Watermarking With Dual Modulation Authentication
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Solution Overview
Problem
Existing vehicle communication systems lack effective methods to authenticate and protect sensitive data transmitted over internal communication links, making them vulnerable to interference and unauthorized access.
Innovation Solution
A dual-modulation technique is employed where sensitive data is transmitted using a differential mode, and a watermarking signal is overlaid using a common mode, allowing for authentication and additional data conveyance, with parameters like spreading code rate, phase shift, and amplitude adjusted dynamically based on interference and message sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted over internal communication links without watermarking, then communication simplicity is maintained, but data authenticity and security deteriorate
Solution Approach 1:
The patent embeds a watermarking signal within the data communication signal structure. The watermarking signal is nested alongside the data signal on the communication bus, allowing both to coexist without requiring separate physical channels. This nesting approach enables authentication functionality to be integrated into the existing communication infrastructure without adding substantial hardware complexity.
Solution Approach 2:
The patent introduces a watermarking signal as an intermediary element that carries authentication information. This intermediary signal does not directly convey the primary data but provides a layer of verification that can be independently processed by the receiving device to authenticate the data signal's origin and integrity.
2Reliability
If a watermarking signal is overlaid on data messages, then data security and authentication are improved, but signal interference and electromagnetic noise increase
Solution Approach 1:
The patent applies different modulation characteristics to the data signal and watermarking signal, creating local differentiation in the signal domain. The data signal uses one modulation mode while the watermarking signal uses another, allowing the receiving device to distinguish between them through selective demodulation based on their distinct local characteristics.
Solution Approach 2:
The patent segments the communication signal into distinct components - a data signal carrying primary information and a separate watermarking signal carrying authentication information. This segmentation allows each component to be processed independently, enabling the receiving device to filter and identify the watermarking signal specifically for authentication purposes without interfering with data transmission.
3Adaptability or versatility
If dual modulation modes are used for data and watermarking signals, then authentication capability and data conveyance are improved, but system complexity and processing requirements increase
Solution Approach 1:
The patent designs the communication system to handle multiple functions through a unified approach. The same communication bus and basic receiver infrastructure are used to transmit both data signals and watermarking signals, with the receiving device capable of performing both data reception and authentication functions using the existing hardware with additional processing software.
Data Source
AI summary
A computer includes a processor and a memory, the memory stores instructions executable by the processor to generate first and second messages for transmission via a communications bus via a first modulation mode and to generate first and second watermarking signals for transmission on the communications bus via a second modulation mode, in which the first and second modulation modes are isolated from each other. The instructions may additionally be to transmit the first message overlaid by the first watermarking signal and to transmit the second message overlaid by the second watermarking signal, the second watermarking signal having a parameter that varies from the first watermarking signal.