Thermal Feedback PUF Circuit for Stable Key Generation
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Solution Overview
Problem
Current Physically Unclonable Function (PUF) circuits in cryptographic systems suffer from high bit error rates due to temperature and supply voltage variations, making them susceptible to attacks and requiring additional error correction mechanisms.
Innovation Solution
The implementation of a multi-stage machine-learning resistant PUF circuit design with wide gate-source shorted transistor pairs and a thermal feedback system to maintain a stable temperature, reducing bit error rates and enhancing security through supply voltage and temperature insensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PUF circuits are used, then unique cryptographic keys are generated, but high bit error rates occur due to temperature and supply voltage variations
Solution Approach 1:
The patent implements a thermal feedback system that continuously monitors the temperature of the PUF circuit and dynamically adjusts the bias current to compensate for temperature variations. This feedback mechanism maintains stable transistor matching conditions across different temperatures, significantly reducing bit error rates while preserving the unique cryptographic key generation capability
Solution Approach 2:
The patent changes the operating parameters of the PUF circuit by implementing dynamic biasing schemes that adjust supply voltage and current levels based on environmental conditions. By modifying these electrical parameters in response to temperature and supply variations, the circuit maintains consistent performance and low bit error rates across different operating conditions
2Reliability
If error correction mechanisms are added to PUF circuits, then bit error rates are reduced, but device complexity and security vulnerability increase
Solution Approach 1:
The patent preemptively compensates for potential errors by implementing temperature compensation and stabilization mechanisms before bit errors can occur. The thermal feedback system and stabilized biasing circuits prevent mismatch conditions from developing, cushioning against the formation of bit errors rather than correcting them after occurrence, thereby eliminating the need for complex post-error correction mechanisms
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
This design significantly reduces bit error rates, minimizing the need for error correction mechanisms and enhancing the security and reliability of cryptographic systems by maintaining consistent performance across varying conditions.
Implementation Method 1
a thermal feedback system to maintain a stable temperature
Implementation Method 2
wide gate-source shorted transistor pairs
Data Source
AI summary
An apparatus is provided which comprises: a phase detector to receive a reference clock and a feedback clock; and one or more switchable heat elements controllable by an output of the phase detector, wherein the one or more switchable heat elements are coupled to a physically unclonable function circuit.