Reconfigurable Liquid Crystal-Based Physical Unclonable Function Integrating Optical and Electrical Responses.

Area of Science:

• Materials Science
• Electrical Engineering
• Computer Science

Background:

• Physical unclonable functions (PUFs) are hardware security solutions relying on unique device randomness.
• Existing PUFs often have single-factor challenges and fixed key generation, leading to vulnerabilities.
• Limitations in current PUF technology necessitate advancements in reconfigurability and multidimensional security.

Purpose of the Study:

• To develop a reconfigurable and multidimensional PUF system.
• To integrate liquid crystal (LC) technology with organic field-effect transistors (OFETs) for enhanced security.
• To address the limitations of fixed-structure PUFs and improve resistance to brute-force attacks.

Main Methods:

• Integration of a liquid crystal (LC) based PUF into an organic field-effect transistor (OFET) architecture.
• Utilizing unique optical fingerprint textures and random molecular alignment of semiconductive smectic LC material for PUF generation.
• Implementing a heating and cooling process for reconfiguring the PUF's properties.

Main Results:

• Demonstration of a combined optical and electrical PUF system.
• Achieved reconfigurability of the PUF through thermal cycling.
• Exhibited multi-response factors enabling hierarchical authentication for enhanced security.

Conclusions:

• The developed LC-OFET PUF overcomes limitations of fixed-structure PUFs through reconfigurability.
• The multidimensional and reconfigurable nature provides robust security for anticounterfeiting and cryptographic applications.
• This approach offers a promising pathway for advanced hardware security solutions.