Exhaust Gas Manipulation Detection Using Encrypted Model Values
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Solution Overview
Problem
Existing methods for detecting manipulations in exhaust gas systems are inadequate in preventing complex manipulations and ensuring the security of sensor values, as they are difficult to encrypt and share among multiple controllers.
Innovation Solution
The method involves sending encrypted model values from the control unit to an external checking unit, which performs complex evaluations, including plausibility checks and active interventions, to enhance detection and make manipulation more difficult by increasing the effort required for attackers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensor values are shared among multiple controllers, then system functionality is improved, but security and encryption difficulty worsen
Solution Approach 1:
The patent segments the data transmission system into two distinct paths: encrypted model values sent to the checking unit, and unencrypted sensor values shared among controllers. This segmentation allows sensor values to be freely shared for system functionality while model values remain encrypted for security, resolving the contradiction between adaptability and reliability.
2Reliability
If encryption is applied to sensor values, then security is improved, but ease of operation worsens
Solution Approach 1:
The patent applies encryption selectively rather than universally: model values are encrypted when transmitted to the checking unit, while sensor values remain unencrypted for general use. This local quality approach ensures security where needed without compromising ease of operation in other parts of the system.
3Adaptability or versatility
If complex manipulation devices are used, then manipulation capability is improved, but detectability worsens
Solution Approach 1:
The patent implements a feedback mechanism where the checking unit receives encrypted model values, independently calculates expected values, compares them with actual sensor readings, and sends back manipulation detection results. This feedback loop enables detection of even complex manipulations by continuously verifying system consistency.
Solution Approach 2:
The system performs preliminary calculations of model values before transmission to the checking unit. These pre-calculated encrypted model values serve as a baseline for detecting manipulations, enabling the checking unit to identify deviations caused by complex manipulation devices before they can cause harm.
Data Source
AI summary
A method detects a manipulation of an exhaust gas system, in which measured values are sent to an external checking unit by a control unit of the exhaust gas system. In the external checking unit, an evaluation of the exhaust gas system as “manipulated” or as “not manipulated” takes place. Model values are formed in the control unit, which are at least partially formed from the measured values which are sent to the external checking unit. The external checking unit takes the model values and the measured values into consideration in the evaluation of the exhaust gas system.