Asynchronous PUF Security Device Blind Zone Reduction
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Solution Overview
Problem
Conventional security devices with physical unclonable functions (PUFs) face challenges in minimizing the blind zone during digital random signal validity detection, as they rely on synchronous configurations, which result in inefficiencies and reduced entropy values.
Innovation Solution
The implementation of an asynchronous configuration for the security device, which minimizes the blind zone by controlling the reset signal's logic levels, thereby increasing entropy values and reducing the area required for the PUF implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a synchronous configuration is used for validity detection, then the detection mechanism is simple to implement, but a blind zone is generated every cycle reducing detection effectiveness
Solution Approach 1:
The patent inverts the conventional synchronous detection approach by using asynchronous detection. Instead of using a synchronous clock to enable detection during active periods and create blind zones during inactive periods, the invention uses an asynchronous detector that continuously monitors digital random signals without being constrained by clock cycles, thereby eliminating the blind zone problem while maintaining implementation feasibility
Solution Approach 2:
The patent transitions from a static synchronous detection system to a dynamic asynchronous detection system. The asynchronous detector adapts to signal transitions regardless of timing, allowing the detection mechanism to respond dynamically to signal changes without being bound by fixed clock periods, thus eliminating blind zones while keeping the implementation relatively simple
2Device complexity
If a synchronous configuration is used for validity detection, then the system structure is simplified, but the blind zone period increases reducing entropy
Solution Approach 1:
The patent inverts the conventional synchronous detection approach by using asynchronous detection. Instead of using a synchronous clock to enable detection during active periods and create blind zones during inactive periods, the invention uses an asynchronous detector that continuously monitors digital random signals without being constrained by clock cycles, thereby eliminating the blind zone problem while maintaining implementation feasibility
Solution Approach 2:
The asynchronous detection mechanism enables continuous monitoring of digital random signals without interruption. Unlike synchronous detection that periodically enables and disables detection creating blind zones, the asynchronous detector maintains continuous operation, ensuring no useful action is lost and maximizing entropy generation throughout the entire operational period
3Stability of the object's composition
If the reset signal period is extended, then the system has more time to stabilize, but the blind zone increases reducing security
Solution Approach 1:
The patent applies preliminary action by performing the reset operation quickly and then immediately transitioning to continuous asynchronous detection. The reset signal is applied briefly to initialize the system state, and once stabilization is achieved, the asynchronous detector begins continuous monitoring without waiting for extended reset periods, thus achieving both stability and security by detecting signals as soon as they are valid
Solution Approach 2:
The patent rushes through the reset period by minimizing its duration and quickly transitioning to the detection phase. Instead of maintaining an extended reset state that creates a large blind zone, the system quickly completes the necessary stabilization and immediately begins continuous asynchronous detection, effectively skipping the harmful extended blind zone period while ensuring system stability
Data Source
AI summary
The inventive concept provides a security device capable of reducing an area of a die required for implementation of a stable PUF by increasing the value of entropy from a predefined number of entropy sources and/or minimizing a blind zone of a validity checking module. The security device uses an asynchronous configuration to minimize a blind zone. In various embodiments of the inventive concept, the blind zone is generated only in a period when a reset signal is at a first logic level. Therefore, it is possible to minimize the blind zone by minimizing a period in which the reset signal is at such logic level. A semiconductor device, semiconductor package, and/or smart card can be provided with such security device, as well as a method for determining a validity of a random signal using a semiconductor security device.