Transceiver Signal Overlay for Vehicle Bus Authentication
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Solution Overview
Problem
In vehicle systems, unauthorized communication devices can infiltrate and manipulate data by connecting to buses like CAN, posing a risk to vehicle control and security systems, necessitating a method to detect and prevent such unauthorized access.
Innovation Solution
A transceiver system that overlays a cryptographic datum onto physical communication signals, allowing authorized devices to authenticate while maintaining compatibility with existing communication protocols, enabling detection of unauthorized access attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cryptographic authentication is implemented in communication systems, then security against unauthorized access is improved, but device complexity and protocol compatibility are worsened
Solution Approach 1:
The patent combines the cryptographic authentication signal with the existing communication protocol signal by overlaying them on the same physical medium. The transmitter outputs both the first signal (according to the physical communication protocol) and the second signal (comprising cryptographic datum), which are overlaid onto one another as an overlay signal. This merging approach allows security functionality to be added without requiring separate dedicated communication channels or significantly increasing device complexity.
Solution Approach 2:
The overlay signal serves multiple functions simultaneously: it carries both the operational communication data (first signal) and the authentication information (second signal with cryptographic datum). The receiver processes the overlay signal to extract both the communication information and the cryptographic datum, enabling a single communication infrastructure to support both data transmission and security authentication functions.
2Reliability
If cryptographic authentication is implemented in communication systems, then security against unauthorized access is improved, but compatibility with existing protocols is worsened
Solution Approach 1:
The patent merges the cryptographic authentication functionality with the existing communication protocol by overlaying the second signal (comprising cryptographic datum) onto the first signal (according to the physical communication protocol). The resulting overlay signal maintains compliance with the physical communication protocol while embedding authentication information, thereby preserving protocol compatibility while adding security functionality.
Solution Approach 2:
The overlay signal acts as an intermediary that bridges existing communication infrastructure and new authentication requirements. By embedding the cryptographic datum within the structure of the existing protocol signal rather than replacing it, the system enables authentication without disrupting legacy protocol compatibility or requiring widespread infrastructure changes.
3Device complexity
If signal overlay technique is used to embed cryptographic data, then device complexity is reduced, but signal detection and processing difficulty increases
Solution Approach 1:
The receiver uses feedback mechanisms to process the overlay signal and extract both the communication information and cryptographic datum. The feedback loop enables the receiver to adjust its processing based on the received signal characteristics, improving its ability to detect and separate the overlaid signals despite their combined nature.
Data Source
AI summary
A transceiver is disclosed including a transmitter designed to output a first signal according to a physical communication protocol, and to output a second signal comprising at least one cryptographic datum. The first and the second signal may be overlaid onto one another as an overlay signal at the output of the transceiver, and may comply with the physical communication protocol. The overlay signal may be received and processed by a receiver.