Dual paths cryptosystem based on tilt Fresnel diffraction using non-spherical mirror and phase modulation in expanded...

Area of Science:

• Optics
• Cryptography
• Image Processing

Background:

• Optical image cryptosystems are crucial for secure data transmission.
• Existing methods face challenges in complexity and security.
• Fractional Fourier transform offers advanced signal processing capabilities.

Purpose of the Study:

• To propose a novel dual-optics paths optical image cryptosystem.
• To enhance security through combined tilt Fresnel diffraction and extended fractional Fourier transform (eFrFT).
• To utilize non-spherical mirrors and random phase modulation for encryption.

Main Methods:

• A dual-optics system employing tilt Fresnel diffraction with a non-spherical mirror.
• Phase modulation in the extended fractional Fourier transform (eFrFT) domain for encoding image data.
• Combining data from dual channels with random data to form the encrypted image.
• Using system parameters and random phase as decryption keys.

Main Results:

• Successful implementation of a dual-channel optical encryption system.
• Demonstrated security through various potential attack experiments.
• Validation of the proposed cryptosystem's effectiveness.

Conclusions:

• The proposed dual-optics cryptosystem offers a robust and secure method for optical image encryption.
• The combination of tilt Fresnel diffraction and eFrFT provides enhanced security features.
• The system's parameters and random phase serve as effective decryption keys, ensuring data confidentiality.