MEMS-Backed Active Transistor PUF for Tamper-Resistant Hardware Identity
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Solution Overview
Problem
Existing systems lack a reliable method to provide a unique digital identification to hardware that changes permanently with physical alterations, necessitating a technology that can integrate into electronic systems to validate hardware identity.
Innovation Solution
A physical unclonable function (PUF) circuit is developed, incorporating micro-electromechanical systems (MEMS) structures and active transistor PUF circuitry. The MEMS structures provide outputs such as active oscillations, charge, resistance, inductance, and capacitance values, which, combined with manufacturing variations in the active transistor PUF circuitry, generate a unique PUF response to challenge inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hardware identification methods are used, then the system can provide basic identification, but the identification can be cloned or tampered with and does not permanently change with physical alterations
Solution Approach 1:
The patent replaces traditional electronic identification systems with a physical unclonable function (PUF) based system that utilizes inherent physical variations in MEMS structures and transistor characteristics. The PUF generates unique digital identifiers based on physical properties such as oscillation frequencies, capacitance values, and resistance measurements that are determined during manufacturing and cannot be replicated, thereby providing tamper-resistant hardware identification.
Solution Approach 2:
The patent utilizes changes in physical parameters during manufacturing processes to create unique identifiers. Specifically, it measures oscillation frequencies, capacitance values, and resistance measurements of MEMS structures and transistor circuits that naturally vary due to manufacturing tolerances. These parameter variations are captured and used to generate unique digital fingerprints for each hardware device, ensuring that physical alterations permanently change the identification.
2Reliability
If a PUF circuit with MEMS structures and active transistor circuitry is implemented, then unique digital identification resistant to cloning is achieved, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions into a single PUF circuit module. The MEMS structures serve both as mechanical resonators for generating unique frequency signatures and as part of the overall identification system. The active transistor circuitry performs multiple roles including signal amplification, frequency measurement, capacitance sensing, and digital identifier generation. This multi-functionality reduces the need for separate components and simplifies the overall system architecture despite the advanced functionality required for anti-cloning protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The PUF circuit effectively provides a unique digital identification that is resistant to cloning and tampering, ensuring network integrity by validating hardware identity and altering it permanently with physical changes.
Implementation Method 1
one or more micro-electromechanical systems (MEMS) structures configured to provide an output, wherein the output includes active oscillations
Implementation Method 2
the output includes active oscillations, charge, resistance, inductance, and/or capacitance values
Data Source
Figure 1A
Figure 1B
Figure 2A~2C
AI summary
Systems and methods for an active transistor PUF circuit with MEMS uniqueness are described herein. In one example, a PUF circuit includes one or more MEMS structures configured to provide an output, wherein the output includes active oscillations, charge, resistance, inductance, and/or capacitance values. The PUF circuit further includes active transistor PUF circuitry communicatively coupled to the one or more MEMS structures. The active transistor PUF circuitry is configured to receive a challenge input and generate a PUF response in response to the challenge input. The PUF response is generated based on the output provided by the one or more MEMS structures and manufacturing variation in components of the active transistor PUF circuitry. The PUF response generated by the active transistor PUF circuitry is an output of the PUF circuit.