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Optical single-channel color image encryption based on chaotic fingerprint phase mask and diffractive imaging
Applied Optics
|February 23, 2023
Summary
This study introduces a novel optical image encryption method using chaotic fingerprint phase masks for enhanced security. The technique offers a simple yet robust way to encrypt and decrypt color images, improving data protection.
Area of Science:
- Optics and Photonics
- Information Security
- Applied Mathematics
Background:
- Traditional image encryption methods face challenges in security and complexity.
- Optical encryption offers potential advantages in speed and security.
Purpose of the Study:
- To propose a novel optical single-channel color image encryption scheme.
- To enhance security by utilizing chaotic fingerprint phase masks and diffractive imaging.
- To offer a simpler alternative to existing encryption methods like digital holography.
Main Methods:
- Generation of random phase masks using a fingerprint, chaotic Lozi map, and SHA-256.
- Encryption of a color image (encoded as grayscale) into a noise-like pattern using phase truncation and diffractive imaging.
- Decryption using an iterative phase retrieval algorithm with fingerprint and phase keys.
Main Results:
- Successful encryption and decryption of a color image into a noise-like pattern.
- Demonstration of enhanced security through the use of fingerprint as a direct key.
- Verification of feasibility, security, and robustness via numerical simulations.
Conclusions:
- The proposed chaotic fingerprint phase mask-based optical encryption scheme is feasible, secure, and robust.
- The use of a fingerprint as a key significantly improves security by eliminating transmission over networks.
- The method provides a simpler implementation compared to digital holography-based schemes.
