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Hierarchical chaotic image encryption algorithm based on plaintext association and DNA encoding
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DOI：10.1016/j.dsp.2026.106102.png)
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Abstract
En 中文
Most existing encryption algorithms depend on the single chaotic mapping or single-layer encryption technique such that the stringent security requirements in sensitive domains cannot be satisfied for information transmission. In this paper, the hierarchical chaotic image encryption (HCIE) algorithm is proposed based on plaintext association and DNA encoding (PADE). The proposed HCIE-PADE algorithm contains both the pixel layer and the DNA encoding layer. The pixel layer employs Tent, Piecewise Linear, and Logistic maps to generate multi-source chaotic sequences. The plaintext association diffusion mechanism is also introduced to ensure both key pixels and global statistical attributes of the plaintext image dynamically contribute to keystream formation. The chaotic Fisher-Yates algorithm is incorporated to enhance scrambling complexity. The DNA encoding layer employs the H & eacute;non map to achieve ascending-order scrambling and chained diffusion. By integrating multi-source chaotic sequence with multi-level encryption, the proposed HCIE-PADE scheme substantially increases encryption depth. Simulation results and performance analysis demonstrate the proposed algorithm's effectiveness, high complexity and robustness, featuring a large key space of 2349 and strong resistance to differential attacks, with NPCR and UACI values approaching their theoretical expectations.
Keywords:
Chaotic mappings
Plaintext association diffusion
Chaotic Fisher-Yates scrambling
DNA encoding
Image encryption
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