Threat-to-Requirement Matching

Threat-to-Requirement Matching is the process of systematically mapping identified cybersecurity threats to specific security requirements, ensuring each threat has a corresponding control measure. This mechanism is central to the Threat Analysis and Risk Assessment (TARA) process defined in ISO/SAE 21434. Unlike static threat lists, this approach creates a traceable link from threat scenario to mitigation, enabling engineers to be certain that every high-risk scenario is addressed by a verifiable requirement. This ensures compliance with UN R155/R156 regulations and prevents security gaps during the automotive development lifecycle.

In practice, automotive OEMs and Tier 1 suppliers implement this through a three-step process: 1) Threat-to-asset mapping using frameworks like STRIDE or ATT&CK; 2) Automated requirement-threat correlation using requirement management tools (e.g., DOORS, Polarion); 3) Verification and validation (V&V) to ensure each requirement effectively mitigates its linked threat. Real-world implementation in European OEMs has shown that automated Threat-to-Requirement Matching can reduce cybersecurity-related rework by up to 35% and increase compliance audit-readiness by 50% within the first year of adoption.

Taiwanese enterprises typically face three challenges: lack of interdisciplinary expertise (combining automotive engineering with cybersecurity), high-cost of specialized tooling, and difficulty in managing supplier-level requirements. To overcome these, companies should: a) Invest in training programs for engineers on ISO/SAE 21434; b) Adopt agile requirement-engineering methodologies to speed up the matching process; c) Establish clear KPIs, such as 'Requirement-to-Threat Coverage Ratio' (target >98%), to be monitored quarterly. Successful implementation requires a phased approach, starting with pilot projects on specific ECUs before scaling to the entire vehicle platform.

Winners Consulting Services Co., Ltd. specializes in Threat-to-Requirement Matching for Taiwan enterprises, delivering compliant management systems within 90 days. Free consultation: https://winners.com.tw/contact