CAN traffic

CAN traffic refers to the flow of digital messages, or frames, exchanged between Electronic Control Units (ECUs) over a vehicle's Controller Area Network (CAN) bus. Standardized as ISO 11898, it's the primary means of in-vehicle communication. In the context of risk management, CAN traffic is the main data source for automotive cybersecurity monitoring. According to ISO/SAE 21434, manufacturers must implement measures to detect anomalies in vehicle communications. By analyzing patterns in CAN traffic—such as message frequency, ID sequences, or data payloads—an Intrusion Detection System (IDS) can identify malicious activities like spoofing, denial-of-service, or replay attacks, forming a critical layer of a defense-in-depth strategy.

In enterprise risk management, CAN traffic analysis is a core practice for implementing a Cybersecurity Management System (CSMS). Key steps include: 1) Performing a Threat Analysis and Risk Assessment (TARA) per ISO/SAE 21434 to identify threats targeting CAN communications. 2) Deploying monitoring solutions, such as an Intrusion Detection System (IDS) on a central gateway or specific ECUs, to analyze traffic in real-time using rule-based or machine learning algorithms. 3) Establishing an incident response process where detected anomalies are sent to a Vehicle Security Operations Center (VSOC) for analysis. A leading automotive OEM implemented this, achieving a 99% detection rate for malicious messages and reducing false positives by 85%, ensuring compliance with UN R155 for vehicle type approval.

Taiwanese enterprises face three primary challenges: 1) Legacy system integration, as older vehicle E/E architectures lack the computational resources for security monitoring. 2) A talent gap in professionals skilled in both automotive protocols and cybersecurity. 3) Supply chain complexity, making end-to-end monitoring and data consistency across components from various suppliers difficult. To overcome these, companies should: first, adopt lightweight, embedded detection algorithms deployed on central gateways (6-month timeline); second, partner with expert consultancies like Winners Consulting for training and guidance (3-month timeline); and third, enforce cybersecurity requirements (ISO/SAE 21434) and standardized reporting formats in supplier contracts to ensure seamless integration.

Winners Consulting specializes in CAN traffic for Taiwan enterprises, delivering compliant management systems within 90 days. Free consultation: https://winners.com.tw/contact