Bus Node Intrusion Interception via Controller Bypass Line
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Solution Overview
Problem
Bus systems, particularly those using CAN protocols, are vulnerable to targeted attacks and manipulations, which can disrupt communication and compromise the operation of associated technical systems.
Innovation Solution
A node device for a bus system is designed with a transceiver, controller, processor, and an intrusion detection system. The processor is connected to the transceiver via a controller bypass line, allowing it to intercept and manipulate signals to prevent intrusions, without requiring additional hardware or adaptations to the bus system protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intrusion detection systems are implemented to detect intrusions in bus systems, then security against targeted attacks is improved, but device complexity increases due to additional hardware requirements
Solution Approach 1:
The patent introduces a controller bypass line as an intermediary connection that allows the processor to directly access the transceiver and intercept frames before the controller processes them. This mediator approach enables intrusion detection without requiring additional hardware components, as the existing processor is empowered to monitor and block suspicious frames through the bypass line.
Solution Approach 2:
The patent extracts the intrusion detection function from separate hardware components and integrates it into the existing processor through software or firmware implementation. By taking out the detection logic from dedicated hardware and embedding it in the processor, the system achieves security functionality without increasing hardware complexity.
2Reliability
If traditional intrusion detection systems are used that require additional hardware, then intrusion detection capability is improved, but ease of manufacture deteriorates due to additional hardware requirements
Solution Approach 1:
The patent makes the existing processor multi-functional by enabling it to perform both normal control operations and intrusion detection functions. The processor uses the controller bypass line to intercept and analyze frames, combining data processing and security monitoring in a single component, thereby eliminating the need for additional dedicated hardware and simplifying manufacturing.
3Speed
If processor bypass lines are implemented for intrusion interception, then security response speed is improved, but device complexity increases due to additional connection lines
Solution Approach 1:
The controller bypass line is established in advance during system configuration, creating a pre-configured direct path between the processor and transceiver. This preliminary setup enables the processor to immediately intercept and respond to intrusions without waiting for controller processing, achieving fast security response while using an existing communication path rather than adding complex dynamic connections.
Data Source
AI summary
A node device for a bus system, including a transceiver for connecting to a bus of the bus system; a controller connected to the transceiver via a transmit line and via a receive line, the controller and the transceiver designed to transfer data from the controller to the transceiver via the transmit line and transferring data from the transceiver to the controller via the receive line; a processor; and an intrusion detection system; the processor being connected to the transceiver via a controller bypass line and being designed to, via the controller bypass line, intercept an intrusion into the bus system identified by the intrusion detection system, the intrusion detection system being designed to detect an intrusion into the bus system in which a further node of the bus system sends a frame including an identifier assigned to a third node of the bus system to the bus.