Trailer Coupling Control Unit Encrypted Rolling Code Authentication
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Solution Overview
Problem
Current trailer hitch control systems lack robust security measures, particularly in ensuring exclusive and authenticated communication between the control unit and the operating device, which is crucial for achieving safety standards like ISO 26262 or ASIL-A/B levels.
Innovation Solution
Implementing an encrypted communication system using a rolling code method with a constantly changing code, where the control device and operating device share a secret key, and utilizing a reading means such as an optical or wireless interface to securely read and store the encryption key, ensuring only authorized devices can communicate, and incorporating a local operating interface that is designed to prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encrypted communication with rolling code is implemented, then security and authentication are improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing encryption keys and rolling code sequences in the control unit before operation. The control unit is pre-configured with a database of valid operating devices and their corresponding encryption keys, allowing immediate secure authentication without real-time key exchange complexity.
Solution Approach 2:
The patent uses copying by implementing a rolling code mechanism where the operating device transmits a code that is copied and verified against pre-stored sequences in the control unit. This allows secure authentication through code comparison rather than complex real-time cryptographic verification.
2Reliability
If individual key reading is implemented for each system, then individual security is improved, but manufacturing and setup complexity increases
Solution Approach 1:
The patent applies self-service by enabling the control unit to autonomously read and store encryption keys from operating devices through integrated reading means. The system performs automatic key management and authentication without requiring manual configuration or external intervention during setup.
Solution Approach 2:
The patent replaces manual key configuration with automated electronic key reading and storage. The reading means (optical or wireless interface) automatically captures and stores encryption keys, substituting mechanical/manual key exchange with automated electronic processes.
3Reliability
If reading means with short distance is used, then unauthorized access is prevented, but ease of operation decreases
Solution Approach 1:
The patent uses an intermediary approach by implementing a teach-in procedure that mediates between security and convenience. During the teach-in process, the reading means operates at extended range to allow key reading, but this mode is time-limited and requires explicit activation, balancing security requirements with operational convenience.
4Ease of operation
If a local operating interface is provided on the control unit, then ease of operation is improved, but unauthorized access risk increases
Solution Approach 1:
The patent applies local quality by providing different operational capabilities at different locations. The control unit has a restricted local operating interface with limited functions accessible only through the teach-in procedure, while full operational control requires the authorized operating device with encryption key, creating localized security zones.
Data Source
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Figure 5
AI summary
The invention relates to a system comprising a control unit (40) for a trailer coupling (20) arranged or arrangable on a motor vehicle (90), the trailer coupling having a coupling element (22) arranged on a coupling arm (21) for coupling a trailer, and a mobile operating device (70) separate from the motor vehicle (90) and the control unit (40), wherein the control unit (40) has control means (55) for controlling at least one function of the trailer coupling (20) and/or evaluation means (56) for evaluating at least one sensor signal from a sensor (34, 35) associated with the trailer coupling (20), wherein the control unit (40) has an operating device interface (71) for wireless communication with a control unit interface (41) of the mobile operating device (70), and wherein the operating device (70) is capable of sending at least one control signal for controlling the control means (55) of the control unit (40) and/or for outputting at least one sensor signal from the is designed with sensors (34, 35).It is provided that the operator interface (71) and the control unit interface (41) shall have encryption means (49) and decryption means (79) for encrypted communication with each other.