Optical image encryption using multimodal biometric keys under the framework of phase-shifting digital holography

Area of Science:

• Optics and Photonics
• Information Security
• Biometrics

Background:

• Traditional image encryption methods face challenges in security and robustness.
• Multimodal biometrics offer enhanced security compared to unimodal systems.
• Digital holography provides a robust framework for optical information processing.

Purpose of the Study:

• To propose and validate a novel optical image encryption technique.
• To leverage multimodal biometric keys (iris, fingerprint, finger vein) for enhanced security.
• To utilize three-step phase-shifting digital holography for encryption and decryption.

Main Methods:

• Image encryption involves DNA encoding with an iris chaotic mask.
• Further encryption uses phase-shifting digital holography and modified double random phase encoding (MDRPE) with fingerprint and finger vein chaotic masks.
• Decryption involves biometric authentication, holographic reconstruction, and DNA decoding.

Main Results:

• Numerical simulations demonstrate the proposed method's high feasibility and robustness.
• The integration of multimodal biometric keys significantly enhances security levels.
• Each biometric key shows strong robustness against potential attacks.

Conclusions:

• The proposed optical image encryption method effectively utilizes multimodal biometrics for secure data protection.
• The combination of digital holography and DNA encoding provides a powerful encryption framework.
• The method exhibits excellent security and robustness, making it suitable for sensitive image encryption applications.