Multiple-image encryption based on phase mask multiplexing in fractional Fourier transform domain

Area of Science:

• Computer Science
• Information Security
• Optics

Background:

• Digital image security is crucial.
• Existing encryption methods face challenges like cross-talk and limited capacity.

Purpose of the Study:

• To propose a novel multiple-image encryption scheme.
• To leverage phase retrieval and fractional Fourier transform for enhanced security and capacity.

Main Methods:

• Encoding grayscale images into phase-only functions using a phase retrieval process.
• Modulating phase functions and encrypting into ciphertext via fractional Fourier transform.
• Generating phase masks during encryption for decryption.

Main Results:

• The proposed phase retrieval process demonstrates high convergence speed.
• The encryption algorithm effectively avoids cross-talk between images.
• Significantly enhanced encrypted capacity is achieved.

Conclusions:

• The developed method offers a secure and efficient approach for multiple-image encryption.
• The technique provides a robust solution for digital image security applications.