Pluggable Trust Architecture for Hardware Security
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Solution Overview
Problem
Modern computing systems face vulnerabilities due to untrusted hardware and software components, which can lead to unauthorized access, data manipulation, and integrity issues, making it difficult to ensure system security and privacy, especially with complex supply chains and intellectual property restrictions.
Innovation Solution
A pluggable trust architecture is introduced, featuring a separately manufactured and verified hardware element that acts as a gatekeeper, physically isolating untrusted components and ensuring only correctly executed data is communicated externally, using a hardware element like 'Sentry' that can be independently sourced and verified, decoupling execution from verification to minimize performance impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pluggable hardware element is introduced to verify system output, then system security and trust are improved, but device complexity increases
Solution Approach 1:
The system is divided into two independent parts: an untrusted computing system and a separately manufactured pluggable hardware element (trust element). The trust element is a standalone component that can be physically separated from the main system, allowing it to be independently verified and trusted while the main system remains untrusted. This segmentation resolves the contradiction by isolating the trust function from the complex untrusted system.
Solution Approach 2:
The pluggable hardware element acts as an intermediary between the untrusted computing system and the external world. It receives output from the untrusted system, verifies its correctness independently, and only releases verified output externally. This intermediary approach allows the system to maintain security without requiring the entire system to be trusted, resolving the contradiction between security and complexity.
2Measurement precision
If execution information is sent to the hardware element for checking, then detection precision of malicious behavior is improved, but loss of time increases
Solution Approach 1:
The trust element is pre-configured with the untrusted system's binary code during manufacturing, before the system operates. This preliminary action allows the trust element to have the verification logic ready in advance, eliminating the need for real-time compilation or analysis of system code during operation, thus reducing verification time while maintaining high detection precision.
Solution Approach 2:
The verification process is replaced from a software-based analysis (which would be time-consuming) to a hardware-based comparison mechanism. The trust element uses dedicated hardware circuits to directly compare output signals with independently computed expected values, enabling fast verification without sacrificing detection precision.
3Manufacturing precision
If the hardware element is separately manufactured and verified, then manufacturing precision of the trust component is improved, but device complexity increases
Solution Approach 1:
The trust verification function is extracted from the main system manufacturing process and placed into a separately manufactured pluggable hardware element. This extracted component can be manufactured in a controlled, trusted environment with verified supply chain processes, while the main system can be manufactured independently. The separate manufacturing approach improves trust component verification without requiring the entire supply chain to be restructured.
Solution Approach 2:
The pluggable hardware element is designed as a universal trust component that can be used with multiple different untrusted systems. By creating a standardized, multi-functional trust element that can verify various systems, the manufacturing process achieves economies of scale and standardized verification procedures, improving manufacturing precision while actually reducing overall supply chain complexity through standardization.
Data Source
AI summary
A pluggable trust architecture addresses the problem of establishing trust in hardware. The architecture has low impact on system performance and comprises a simple, user-supplied, and pluggable hardware element. The hardware element physically separates the untrusted components of a system from peripheral components that communicate with the external world. The invention only allows results of correct execution of software to be communicated externally.