What is ISO/SAE 21434?
ISO/SAE 21434 is the international standard for cybersecurity engineering in road vehicles. Developed jointly by the International Organization for Standardization (ISO) and SAE International, it provides a framework for identifying, assessing, and managing cybersecurity risks throughout the vehicle lifecycle, from concept and development through production, operation, maintenance, and decommissioning.
ISO/SAE 21434 provides cybersecurity engineering processes that organizations commonly follow to support the implementation of an Automotive Cybersecurity Management System (CSMS) under UNECE WP.29 R155.
Why does ISO/SAE 21434 matter?
Modern vehicles rely on increasingly complex electronics, software, connectivity, and autonomous functions, creating a growing number of potential attack surfaces. As a result, cybersecurity has become a critical safety and business concern. ISO/SAE 21434 helps automakers, suppliers, and semiconductor companies establish structured processes for managing these cyber risks and demonstrate due diligence across the supply chain.
What does ISO/SAE 21434 cover?
The standard addresses a broad range of cybersecurity activities, including:
- Cybersecurity management, governance, and risk management
- Threat analysis and risk assessment (TARA)
- Secure product development processes
- Cybersecurity requirements and validation
- Supply chain cybersecurity management
- Vulnerability monitoring and incident response
How ISO/SAE 21434 works
Rather than prescribing specific technologies, ISO/SAE 21434 establishes a risk-based engineering framework. Organizations identify potential threats, evaluate risk, define cybersecurity goals, implement appropriate controls, and maintain evidence that cybersecurity has been addressed throughout development and operation.
ISO/SAE 21434 and automotive semiconductors
Semiconductors are foundational to modern vehicle functionality, supporting everything from powertrain and infotainment systems to advanced driver assistance systems (ADAS) and automated driving systems (ADS). As a result, cybersecurity assurance increasingly includes hardware and silicon-level considerations, especially for security-critical systems. Evidence generated throughout development demonstrates that cybersecurity engineering activities have been performed.
ISO/SAE 21434 and hardware security assurance
One of the challenges in automotive cybersecurity is demonstrating that security requirements have been implemented correctly and consistently across increasingly complex systems-on-chip (SoCs). Hardware security assurance approaches can help engineering teams verify expected security behavior, identify potential weaknesses earlier in development, and generate evidence that supports cybersecurity assessments and compliance activities.
Arteris, Cycuity, and cybersecurity assurance
By integrating Cycuity technology, Arteris helps semiconductor and automotive organizations strengthen hardware security assurance throughout the silicon development process. By providing greater visibility into security requirements, verification activities, and design intent, engineering teams can improve confidence in their cybersecurity engineering process while supporting broader compliance and risk-management objectives.
Benefits of ISO/SAE 21434
- Structured cybersecurity risk management
- Improved consistency across development teams
- Better supply chain cybersecurity coordination
- Earlier identification of security weaknesses
- Greater traceability and compliance evidence
- Improved support for vehicle lifecycle security
Common use cases
- Automotive semiconductor development
- ADAS and autonomous vehicle systems
- Vehicle networking and connectivity platforms
- Electronic control unit (ECU) development
- Automotive software and embedded systems
- Cybersecurity governance and compliance programs
Frequently asked questions
What is ISO/SAE 21434?
It is the international standard that defines cybersecurity engineering processes for road vehicles and their components.
Is ISO/SAE 21434 mandatory?
The standard is not a law, but it is increasingly expected across the automotive industry. It is frequently used to demonstrate cybersecurity due diligence and support compliance with regulations such as UNECE WP.29 R155.
What is TARA?
Threat Analysis and Risk Assessment (TARA) is a core activity in ISO/SAE 21434 that identifies threats, assesses risk, and defines cybersecurity objectives.
How does ISO/SAE 21434 relate to automotive semiconductors?
The standard applies across the automotive supply chain, including semiconductor providers whose technologies contribute to overall vehicle cybersecurity.
How does hardware security assurance support ISO/SAE 21434?
Hardware security assurance helps organizations verify that security requirements have been implemented as intended and provides evidence that can support cybersecurity assessments and compliance activities.
