Microcode Challenge Response for Secure Device Authentication
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Solution Overview
Problem
In complex electronic device manufacturing, the distributed production of components across multiple facilities raises security concerns, as counterfeit devices can be created by reverse-engineering components, leading to intellectual property loss and revenue decline, especially when the final assembly facility is not entirely secure.
Innovation Solution
The implementation of a microcode-based challenge/response process using an augmented processor with a microcode interpreter, where encrypted microcode is decrypted and executed within the processor hardware, ensuring only appropriately signed software is executed and preventing tampering, and a secure boot mechanism is enforced to validate the authenticity of the processor and software.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If components are manufactured by multiple external manufacturers, then manufacturing cost and flexibility are improved, but security risk increases due to potential counterfeiting
Solution Approach 1:
The patent applies preliminary action by embedding a security element during the component manufacturing process itself, before the component is assembled into the final device. This security element contains unique identification data that enables later verification of the component's authenticity and manufacturing origin, preventing counterfeiting while allowing distributed manufacturing
Solution Approach 2:
The patent introduces an intermediary verification system that acts as a mediator between the distributed manufacturing ecosystem and the final device authentication. The security element serves as an intermediary carrier of trust information, allowing external manufacturers to produce components without compromising overall system security through the use of verifiable authentication mechanisms
2Reliability
If security verification is performed on all components, then device authenticity is improved, but processing time and complexity increase
Solution Approach 1:
By performing security verification in advance during component manufacturing and embedding authentication data in the security element, the patent eliminates the need for time-consuming verification processes during final device assembly or operation. The authentication information is prepared beforehand and can be quickly validated later
Solution Approach 2:
The patent extracts the security verification function from the final device assembly process and places it in the component manufacturing process. This separation allows security checks to be performed independently during production without adding time pressure to the main assembly timeline
3Productivity
If distributed manufacturing is implemented, then production capacity is improved, but control over manufacturing security deteriorates
Solution Approach 1:
The patent creates a universal security element that can be applied across multiple component types and manufacturers. This standardized security mechanism maintains consistent security control levels throughout the distributed manufacturing network, allowing the system to scale production capacity while maintaining uniform security standards through a multi-functional authentication approach
Data Source
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AI summary
Augmented processor hardware contains a microcode interpreter. When encrypted microcode is included in a challenge from a service requiring authentication, the microcode may be passed to the microcode interpreter. Based on decryption and execution of the microcode taking place at the processor hardware, tampering by potentially abusive device software may be avoided.