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<p>This paper introduces a robust and lightweight image encryption framework leveraging chaotic dynamics from the Rössler attractor, dynamic 4-bit S-boxes, and a SHA-512-based cryptographic key derived from both image metadata and hardware entropy. The framework combines dynamic substitution, entropy-enhanced XOR, and adaptive pixel scrambling to deliver strong resistance against statistical, linear, and differential cryptanalysis. Its low computational overhead and high randomness make it suitable for real-time multimedia transmission, mobile systems, and embedded platforms. An ablation study demonstrates the individual contribution of each cryptographic layer, and comparative evaluations with existing chaotic systems validate its competitive performance in terms of entropy, pixel correlation, key space, and execution efficiency.</p>

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Balancing efficiency and security: A lightweight chaotic encryption scheme for images

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Madan Mishra,
  • Rakesh Kumar

摘要

This paper introduces a robust and lightweight image encryption framework leveraging chaotic dynamics from the Rössler attractor, dynamic 4-bit S-boxes, and a SHA-512-based cryptographic key derived from both image metadata and hardware entropy. The framework combines dynamic substitution, entropy-enhanced XOR, and adaptive pixel scrambling to deliver strong resistance against statistical, linear, and differential cryptanalysis. Its low computational overhead and high randomness make it suitable for real-time multimedia transmission, mobile systems, and embedded platforms. An ablation study demonstrates the individual contribution of each cryptographic layer, and comparative evaluations with existing chaotic systems validate its competitive performance in terms of entropy, pixel correlation, key space, and execution efficiency.