Embedded System Secure Boot for Priority Software Initialization
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Solution Overview
Problem
Existing aircraft engine control systems face challenges in preventing tampering during initialization and minimizing the impact on engine operation, particularly when software programs are loaded and executed after a reset, which can disrupt engine operation if the initialization protocol is not completed within a certain time.
Innovation Solution
A staged initialization protocol is implemented using cryptographic authentication techniques to authenticate software programs, prioritizing critical engine control software for rapid execution while detecting tampering, thereby ensuring secure and timely initialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete initialization protocol is executed to authenticate all software programs, then security against tampering is improved, but engine operation time is extended and disruptions increase
Solution Approach 1:
The initialization protocol is divided into multiple stages: a first stage that executes critical engine control software immediately with basic authentication, and a second stage that completes full authentication of all software programs. This segmentation allows the system to maintain security while minimizing engine operation delays by prioritizing critical functions.
Solution Approach 2:
Critical engine control software is authenticated and loaded in advance during the first stage before the engine requires full control functionality. This preliminary action ensures that essential functions are ready immediately, reducing the time loss while maintaining security through subsequent completion of the full authentication protocol.
2Reliability
If software programs are authenticated using cryptographic methods, then tampering detection is improved, but initialization complexity increases
Solution Approach 1:
The cryptographic authentication process is segmented into multiple stages with different levels of verification. The first stage uses simplified authentication for critical software, while the second stage implements comprehensive cryptographic verification. This reduces initialization complexity while maintaining strong tampering detection capabilities.
Solution Approach 2:
A memory device serves as an intermediary between the processing device and the software programs, storing authentication data and facilitating the staged verification process. This intermediary structure organizes the complex authentication流程, making it more manageable and systematic.
Data Source
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AI summary
A method is disclosed and includes authenticating a first stage boot loader and authenticating a second stage boot loader in response to authentication of the first stage boot loader. The method also includes executing the second stage boot loader in response to authentication of the second stage boot loader. Executing the second stage boot loader includes loading an operating system, a first set of machine-readable instructions, and first configuration information associated with the first set of machine-readable instructions onto a non-transitory computer-readable medium, wherein the first set of machine-readable instructions and the first configuration information are associated with one or more priority partitions. Executing the second stage boot loader includes authenticating the operating system and the first set of machine-readable instructions. Executing the second stage boot loader includes executing the first set of machine-readable instructions in response to authentication of the operating system and the first set of machine-readable instructions.