ECU Role-Based Security Tickets for Faster Authorized Programming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic control units (ECUs) lack granular security controls, making it difficult to ensure authorized programming and secure adjustments, especially after factory installation, due to cumbersome authentication processes and limited role-based permissions.
Innovation Solution
Implementing a granular security control adjustment authorization ticket (G-SCAAT) system that allows for role-based security parameter adjustments, including a back office counter for authentication, message authentication codes, and specific security values for various roles, enabling secure programming and calibration while reducing the need for repetitive digital signature verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional authentication processes are used for ECU programming, then security is maintained, but the authentication process becomes cumbersome and time-consuming
Solution Approach 1:
The system performs authentication准备工作 in advance by pre-configuring security zones, authentication credentials, and authorization rules in the ECU before programming operations begin. The back office system pre-generates authentication tokens and prepares security parameters, so that during actual programming operations, authentication can proceed quickly using pre-established security contexts rather than performing full authentication sequences each time.
Solution Approach 2:
The authentication system is divided into multiple independent security zones within the ECU, each handling specific authentication functions. The back office system is also segmented into separate modules for token generation, verification, and logging. This segmentation allows different authentication operations to proceed in parallel and reduces the critical path time for authentication processes.
2Adaptability or versatility
If granular security controls are implemented with multiple roles, then programming permissions can be precisely controlled, but the system complexity increases
Solution Approach 1:
The ECU security architecture implements a universal security zone structure that can accommodate multiple roles and permission levels through a common framework. The back office system uses a unified token generation mechanism that works across all role types. This universal structure allows the system to handle diverse programming permission requirements without creating separate complex security subsystems for each role.
Solution Approach 2:
Different security zones within the ECU are configured with specific authorization rules tailored to particular roles (e.g., calibration engineer, software engineer, service technician), while maintaining a consistent overall security architecture. Each zone has customized permission sets appropriate to its function, but all zones operate under the same authentication framework managed by the back office system.
3Reliability
If digital signature verification is performed for each programming operation, then authorization is ensured, but the programming efficiency decreases
Solution Approach 1:
Instead of performing digital signature verification for every single programming operation, the system implements periodic authorization checks at defined intervals and transition points during the programming process. The back office system generates time-limited authentication tokens that remain valid for specific durations or until certain conditions are met, reducing the frequency of full verification cycles while maintaining security.
Solution Approach 2:
Digital signature verification and authorization checks are performed in advance on programming operations that are prepared but not yet executed. The back office system pre-validates programming packages and generates authorization tokens before the actual programming begins, so that during the programming execution phase, the system can proceed more quickly with pre-verified operations.
Data Source
AI summary
A method for securing an electronic control unit (ECU). The method may include generating a granular security control adjustment authorization ticket (G-SCAAT) for securing the ECU according to a plurality of security parameters determined based on to a role selected for a corresponding user. The G-SCAAT may include security values to be used in controlling the ECU to operate according to the security parameters.