Chaos-Sensitive Encryption Frameworks Based on Hyperchaotic Circuit Topologies for Secure Communication

Abstract

Secure communication requires encryption frameworks that are highly sensitive to key variation while still allowing reliable recovery for authorized users. Chaos-based encryption is attractive because nonlinear dynamics can generate complex and unpredictable states for masking and key-stream generation. Recent hyperchaotic cryptosystems have shown that multi-dimensional state coupling improves randomness, synchronization, and ciphertext sensitivity. However, many existing schemes do not clearly explain how circuit topology governs key sensitivity, correlation suppression, and decryption robustness under perturbation. This article presents a chaos-sensitive encryption framework based on a cross-coupled hyperchaotic circuit topology that integrates state generation, key extraction, encryption, and synchronized recovery within one model. The results show that the proposed topology produces diversified bounded trajectories, enhances ciphertext sensitivity, reduces statistical correlation, and preserves accurate decryption only under matched synchronization conditions. These findings support hyperchaotic circuit topology as an effective basis for secure communication in wireless links, sensor networks, and embedded cyber-physical systems.