Controller Area Network (CAN bus)

CAN bus is a multi-master, message-based communication protocol designed by Bosch for real-time vehicular networking. It uses differential signaling to ensure high noise immunity. According to ISO 11898-1:2015, CAN bus employs CSMA/CD+AMP to manage message priority. While robust in industrial environments, its lack of native encryption and authentication makes it vulnerable to cyber threats like signal injection and replay attacks. In the context of ISO/SAE 21434, CAN bus security must be addressed through threat-informed design and robust ECU-to-ECU authentication mechanisms to prevent unauthorized control over critical vehicle functions.

In automotive cybersecurity risk management, CAN bus security is addressed through three practical steps: Asset Identification (mapping all ECUs and their CAN traffic), Threat Modeling (using STRIDE to identify signal spoofing or DoS risks), and Mitigation Implementation (deploying IDS and message-level integrity checks). For example, a Tier 1 supplier in Taiwan implementing TISAX compliance must demonstrate that all CAN-based communications are authenticated. Successful implementation can reduce the risk of remote exploitation by up to 70% and ensure compliance with UNECE WP.29 RTOH regulations, which are mandatory for new vehicle types in Europe and Japan.

Taiwanese automotive suppliers face three primary challenges: regulatory pressure from ISO/SAE 21434 and UNECE WP.29, a shortage of engineers skilled in both automotive protocols and cybersecurity, and the high cost of specialized testing tools like Vector CANalyzer. To overcome these, enterprises should: 1) Prioritize TISAX certification to meet OEM requirements; 2) Invest in standardized security testing processes (e.g., fuzzing and penetration testing); 3. Establish a cross-functional team of embedded engineers and cybersecurity experts. A phased approach starting with a 90-day compliance roadmap is recommended to ensure sustainable adoption.

Winners Consulting Services Co., Ltd. specializes in Controller Area Network (CAN bus) for Taiwan enterprises, delivering compliant management systems within 90 days. Free consultation: https://winners.com.tw/contact