Embedded System Device Identification via Self-Generated Hash
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Solution Overview
Problem
Existing embedded system devices face challenges in secure authentication due to limitations of serial numbers and MAC addresses, which can be easily spoofed, necessitating a more robust method for device identification.
Innovation Solution
Embedded system devices self-generate a unique device identifier based on non-user-configurable parameters, such as hardware and executable code information, which is then verified through a communication link with an authentication server to ensure authenticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If serial numbers or MAC addresses are used for device identification, then device identification is achieved, but the identification can be easily spoofed and is not secure
Solution Approach 1:
The embedded system device autonomously generates its own device identifier by processing executable code through a hash function. The device uses its own internal resources (processor, memory containing the executable code) to create the identifier without requiring external assignment or configuration, making the identification process self-service and inherently tied to the device's actual software state
Solution Approach 2:
The invention changes the parameter used for identification from static hardware identifiers (serial numbers, MAC addresses) to a dynamic identifier generated from the executable code. By applying a hash function to the executable code, the system transforms the code into a fixed-length identifier that changes if the code changes, providing a reliable indicator of the device's actual software state
2Adaptability or versatility
If user-configurable parameters are used for identification, then flexibility is improved, but security is reduced because users can alter identification data
Solution Approach 1:
The memory space is segmented into two distinct parts: a first memory space containing the executable code that is protected from user modification, and a second memory space containing user-configurable parameters. This segmentation ensures that the identifier generation process uses only the protected executable code, while users retain flexibility to configure other system parameters without affecting the authenticity of the device identifier
Solution Approach 2:
The hash function acts as an intermediary that processes the executable code to generate the device identifier. This intermediary transformation ensures that even if users have access to the system, they cannot directly manipulate the identifier without altering the underlying executable code, which is protected. The hash function mediates between the protected code and the identifier, providing both security and determinism
Data Source
AI summary
An embedded system device comprises a processor operatively coupled to a first memory space, a second memory space, and a plurality of user controls. The processor is configured to execute only executable code residing within the first memory space, and the executable code includes authentication routine configured to generate a device identifier based at least upon non-user-configurable parameters of the embedded system device. The second memory space includes user configurable options for use by the processor when executing the executable code. The user controls are adapted to configure the user configurable options within the second memory space, wherein the user controls cannot configure the first memory space.