Time-delay signature concealing electro-optic chaotic system with multiply feedback nonlinear loops.

Area of Science:

• Nonlinear Dynamics
• Optical Engineering
• Information Security

Background:

• Traditional electro-optic chaotic systems face challenges with time-delay signature concealment and limited key space.
• Enhancing the complexity and security of chaotic systems is crucial for advanced applications like secure communication.

Purpose of the Study:

• To propose and analyze a novel time-delay signature (TDS) concealing electro-optic (EO) chaotic system.
• To investigate the impact of multiply feedback nonlinear loops on system complexity, chaos generation, and security performance.
• To evaluate the suitability of the proposed system for secure communication applications.

Main Methods:

• Numerical simulation of a proposed EO chaotic system with mutual injection and multiply feedback nonlinear loops.
• Analysis of system dynamics, including chaos onset and complexity using permutation entropy (PE).
• Evaluation of time-delay signature concealment and key-space expansion.
• Performance assessment of a secure communication system utilizing the proposed chaotic system.

Main Results:

• The proposed system effectively conceals the time-delay signature due to an added nonlinear factor.
• Permutation entropy exceeds 0.96, indicating increased system complexity.
• Chaos is achieved with a low feedback strength (β = 0.8).
• The key space is expanded significantly, approximately 10^12 times larger than classical EO systems.
• The secure communication system demonstrates sensitivity to time-delay parameters and robustness to feedback strength.

Conclusions:

• The novel multiply feedback nonlinear loop structure enhances EO chaotic system complexity and security.
• The proposed system offers effective TDS concealment and a vastly expanded key space.
• The system's performance characteristics make it highly suitable for robust and secure communication.