Secure Element Signal Sensing for Vehicle Access Attack Detection
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Solution Overview
Problem
Vehicle access systems are vulnerable to attacks, particularly fault injection attacks, due to the susceptibility of general-purpose processors and other components like power management units and RF communication units, which are not as secure as certified secure elements.
Innovation Solution
Integrating a sensing unit and processing unit into a secure element to detect and interpret signal characteristics, using machine learning to identify attacks, and performing preventive actions such as deactivating components or warning the main microcontroller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If general-purpose processors and components are used in vehicle access systems, then device complexity and ease of operation are improved, but security reliability deteriorates due to susceptibility to fault injection attacks
Solution Approach 1:
The system is segmented into a secure element (with sensing unit and processing unit) and a host microcontroller. The secure element handles security-critical functions including attack detection through signal monitoring, while the host microcontroller handles general access control operations. This segmentation isolates security functions from vulnerable general-purpose components.
Solution Approach 2:
A sensing unit is introduced as an intermediary component between the host microcontroller and external attack vectors. This sensing unit monitors signal characteristics (voltage, current, timing) on communication buses and power lines, detecting fault injection attacks before they reach vulnerable components. The sensing unit acts as a protective intermediary that filters out malicious signals.
2Reliability
If attack detection and prevention mechanisms are integrated into the secure element, then security reliability is improved, but device complexity increases due to additional sensing and processing units
Solution Approach 1:
The sensing unit, processing unit with machine learning capabilities, and secure element functions are merged into a single integrated secure element device. This consolidation reduces overall system complexity by eliminating separate attack detection modules while maintaining enhanced security functionality within the existing secure element architecture.
Solution Approach 2:
The secure element is designed with multi-functionality, serving both as a traditional security credential verifier and as an attack detection system. The processing unit performs both authentication operations and machine learning-based attack pattern recognition, eliminating the need for dedicated separate detection hardware and reducing overall device complexity.
3Measurement precision
If machine learning models are used to identify attacks based on signal characteristics, then measurement precision of attack detection is improved, but loss of time increases due to processing requirements
Solution Approach 1:
Machine learning models are trained offline beforehand with labeled attack and normal operation data. The trained models are then deployed in the secure element for real-time inference. This preliminary training action separates the time-consuming learning process from runtime detection, enabling fast real-time attack identification without sacrificing precision.
Solution Approach 2:
The sensing unit monitors only critical signal characteristics (voltage deviations, current spikes, timing anomalies) rather than all possible parameters. This selective monitoring of key features provides sufficient detection precision while reducing processing time and computational load compared to comprehensive signal analysis.
Data Source
AI summary
A secure element includes a sensing unit configured to sense one or more signal characteristics. The signal characteristics include characteristics of signals transmitted to and from components of a vehicle access system. The secure element also includes a processing unit configured to conclude, in dependence on an output of the sensing unit, that one or more attacks are carried out on the vehicle access system. A corresponding method of operating a secure element is conceived, and a computer program for carrying out said method is provided.