Amplitude-phase retrieval attack free cryptosystem based on direct attack to phase-truncated Fourier-transform-based...

Area of Science:

• Cryptography
• Optical Information Processing
• Information Security

Background:

• Phase-truncated Fourier-transform-based encryption is vulnerable to specific attacks.
• Iterative amplitude-phase retrieval algorithms pose a security risk.

Purpose of the Study:

• To propose a novel, attack-free cryptosystem.
• To enhance security in Fourier-transform-based encryption.
• To prevent iterative amplitude-phase retrieval attacks.

Main Methods:

• A simple amplitude-phase retrieval attack-free cryptosystem is proposed.
• A random amplitude mask (RAM) is utilized for encryption.
• The RAM is not saved post-encryption, ensuring key security.

Main Results:

• The proposed cryptosystem demonstrates high security.
• The encryption process is nonlinear and avoids iterative calculations.
• Attacks based on iterative amplitude-phase retrieval are rendered unusable.

Conclusions:

• The novel cryptosystem offers a robust solution against known attacks.
• The use of a random amplitude mask significantly enhances encryption security.
• Numerical simulations validate the approach's effectiveness and security.