Floating quick response code based on structural black color with the characteristic of privacy protection

Area of Science:

• Optics and Photonics
• Information Security
• Materials Science

Background:

• Quick Response (QR) codes are vulnerable to cybercriminal exploitation due to ease of duplication.
• Existing QR code security measures often lack robust anti-counterfeiting capabilities.
• The need for secure, verifiable authentication methods is critical in combating digital and physical fraud.

Purpose of the Study:

• To develop a novel floating QR code device with enhanced security features.
• To leverage the moiré principle for 3D visual effects and privacy protection in QR codes.
• To create an inexpensive, mass-producible, and unclonable QR code solution for authentication.

Main Methods:

• Implementation of a floating QR code device utilizing the moiré principle.
• Integration of a microlens array (MLA) for efficient elemental image sampling.
• Development of a virtual mask scheme for elemental image construction to eliminate crosstalk.
• Utilizing metal-coated nanostructures for high-resolution patterned structural black color (>12,500 dpi).

Main Results:

• Demonstration of a floating QR code with a 3D visual effect and inherent privacy protection.
• Achieved high pattern resolution and efficient information encoding via MLA and virtual mask scheme.
• The developed QR code is readable by unmodified smartphones, inexpensive, and mass-producible.
• The device exhibits unclonable properties, offering a significant advantage in anti-counterfeiting.

Conclusions:

• The proposed floating QR code offers a secure, convenient, and cost-effective solution for authentication.
• This technology presents a promising advancement in the fight against counterfeiting and QR code-based cyberattacks.
• The combination of moiré principle, MLA, and nanostructure fabrication provides a robust platform for secure data display.