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A color image encryption method based on a CML-ECA neurodynamic chaotic system and TV-BST architecture
Xin Xie1, Sheng Yang1, Hao Ning1
1School of Information Science and Technology, Hainan Normal University, Haikou, 571158, Hainan, China.
Scientific Reports
|July 4, 2026
Summary
This study introduces a novel color image encryption method using a coupled chaotic system and a permutation-diffusion framework. The technique enhances security and robustness for high-resolution images against various attacks.
Area of Science:
- Cryptography
- Image Processing
- Complex Systems
Background:
- Existing chaotic image encryption methods have limitations in integrating chaotic dynamics, S-box design, and encryption architecture, particularly for high-resolution color images.
- Limited coupling between chaotic systems and encryption frameworks hinders overall security and performance.
Purpose of the Study:
- To propose a secure and effective color image encryption method for high-resolution images.
- To enhance the randomness, sensitivity, and robustness of chaotic image encryption.
Main Methods:
- Integration of a coupled map lattice-excitatory-inhibitory (CML-ECA) neurodynamic chaotic system with a transpose-based block substitution and transposition (TV-BST) permutation-diffusion framework.
- Development of a composite chaotic model with adaptive coupling and neurodynamic feedback to generate robust spatiotemporal chaotic sequences.
- Construction and optimization of a chaotic S-box using Fisher-Yates shuffle and a genetic algorithm.
- Implementation of key-dependent permutation and chained diffusion across color channels.
Main Results:
- The proposed method generates chaotic sequences with enhanced sensitivity, entropy, and finite-precision robustness.
- Experimental results demonstrate near-uniform histograms, low adjacent-pixel correlation, and high key sensitivity.
- Achieved high values for the Number of Pixel Change Rate (NPCR) and Unified Average Changing Intensity (UACI), indicating strong diffusion and confusion.
- The encryption scheme showed robustness against noise and cropping attacks.
Conclusions:
- The developed co-designed framework offers an effective and secure solution for color image encryption.
- The integration of advanced chaotic systems and permutation-diffusion techniques significantly improves encryption security and robustness.
- The method is well-suited for securing high-resolution color images in various applications.
