Hardware Integrity Check via Challenge-Response Verification
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Solution Overview
Problem
Current technologies inadequately address hardware tampering by focusing on software integrity, leaving hardware components vulnerable to attacks such as removal, addition, or emulation, which can compromise the integrity of devices crucial for revenue protection and sensitive applications like conditional access systems and e-health.
Innovation Solution
A data processing device generates a device verification key based on responses from hardware components, using a chain of challenges and responses to verify device integrity, ensuring mission critical information is decrypted only when the correct responses are provided, thus preventing tampering attempts from rendering the device non-functional.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software-based integrity verification methods are used, then software integrity can be measured and verified, but hardware tampering attacks remain undetected and vulnerable
Solution Approach 1:
The verification process is segmented into multiple hardware components (first hardware component, second hardware component, third hardware component) that perform distinct functions: challenge generation, challenge processing with response generation, and verification. This segmentation distributes the verification functionality across separate physical components, making hardware tampering detectable while maintaining software integrity verification capabilities.
Solution Approach 2:
A challenge-response mechanism acts as an intermediary between hardware components and the verification process. The first hardware component generates challenges, the second hardware component processes challenges and generates responses, and the third hardware component verifies responses. This intermediary challenge-response system enables hardware integrity verification without compromising software-based verification methods.
2Reliability
If hardware components are made tamper-resistant through verification mechanisms, then device integrity is protected, but the complexity of the device increases
Solution Approach 1:
The hardware components are designed with multi-functionality: the first hardware component both generates challenges and verifies responses; the second hardware component both processes challenges and generates responses; the third hardware component both receives responses and validates device integrity. This multi-functionality reduces the need for separate dedicated verification hardware, thereby limiting complexity increase while maintaining strong integrity protection.
Solution Approach 2:
The verification system is self-service in that the hardware components themselves perform the verification process without requiring external verification infrastructure. The challenges and responses are generated and validated within the device's own hardware components, eliminating the need for complex external verification systems and reducing overall device complexity.
3Reliability
If mission critical information is encrypted and requires verification for decryption, then tampering detection is improved, but device functionality may be compromised if verification fails
Solution Approach 1:
The verification process incorporates feedback mechanisms where the third hardware component receives responses from the second hardware component and validates them against expected values. Based on this feedback, the system determines whether device integrity is maintained. If verification succeeds, mission critical information is decrypted and device functionality is restored; if verification fails, the system detects tampering and prevents unauthorized access. This feedback loop ensures both tampering detection and controlled functionality availability.
Solution Approach 2:
The challenge-response verification is performed as a preliminary action before decrypting mission critical information. The first hardware component generates challenges, the second hardware component processes them and generates responses, and the third hardware component verifies these responses before allowing decryption. This preliminary verification ensures that only authenticated, non-tampered devices can access mission critical information, improving tampering detection while maintaining functionality through controlled access.
Data Source
Figure 1a~1c
Figure 2~3
Figure 4a~4b
AI summary
A data processing device is disclosed, which comprises a plurality of data processing hardware components, such as one or more of a microprocessor, a central processing unit, a system on chip hardware component, a conditional access hardware component, a descrambler hardware component, a graphics hardware component, a video hardware component and a field programmable gate array hardware component. A first hardware component of the plurality of data processing hardware components is configured to send a challenge to at least one remaining hardware component of the plurality of data processing hardware components. Each remaining hardware component is configured to receive a respective challenge and to process the challenge to produce one or more respective responses. The device is configured to use one or more responses to verify device integrity.