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<p>The increasing use of telemedicine and Internet of Medical Things (IoMT) systems demands secure medical image encryption that is both lightweight and suitable for resource-constrained hardware. Conventional cryptographic algorithms and many existing chaos-based schemes suffer from high computational complexity, finite-precision degradation, or limited hardware efficiency. This paper proposes a lightweight chaos-based medical image encryption system built on a <i>Proposed Cascaded-Improved Hénon Chaotic Map (PCIHCM)</i>, which combines bidirectional chaotic coupling, bit re-arrangement, and a chaos-whitening mechanism to enhance randomness and extend cycle-length under fixed-point arithmetic. Using this generator, a compact per-pixel encryption scheme based on feedback-driven confusion and modular diffusion is designed, avoiding costly global permutations. Experimental results show near-ideal entropy values (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\approx \)</EquationSource> </InlineEquation> 7.999), negligible pixel correlation, and strong resistance to differential and key-related attacks with a key space of <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(2^{240}\)</EquationSource> </InlineEquation>. Hardware implementation on an Artix-7 FPGA achieves a throughput of 11.52&#xa0;Gbps at 120&#xa0;MHz while consuming only 83&#xa0;mW with very low resource utilization. These findings demonstrate that the proposed system provides an efficient and secure solution for real-time medical image protection in IoMT and embedded medical imaging environments.</p>

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Lightweight chaos-based medical image encryption using Cascaded-Improved Hénon maps

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Merah Lahcene,
  • Merah Hocine,
  • Bensafieddine Djalal Eddine,
  • Ali-Pacha Adda

摘要

The increasing use of telemedicine and Internet of Medical Things (IoMT) systems demands secure medical image encryption that is both lightweight and suitable for resource-constrained hardware. Conventional cryptographic algorithms and many existing chaos-based schemes suffer from high computational complexity, finite-precision degradation, or limited hardware efficiency. This paper proposes a lightweight chaos-based medical image encryption system built on a Proposed Cascaded-Improved Hénon Chaotic Map (PCIHCM), which combines bidirectional chaotic coupling, bit re-arrangement, and a chaos-whitening mechanism to enhance randomness and extend cycle-length under fixed-point arithmetic. Using this generator, a compact per-pixel encryption scheme based on feedback-driven confusion and modular diffusion is designed, avoiding costly global permutations. Experimental results show near-ideal entropy values ( \(\approx \) 7.999), negligible pixel correlation, and strong resistance to differential and key-related attacks with a key space of \(2^{240}\) . Hardware implementation on an Artix-7 FPGA achieves a throughput of 11.52 Gbps at 120 MHz while consuming only 83 mW with very low resource utilization. These findings demonstrate that the proposed system provides an efficient and secure solution for real-time medical image protection in IoMT and embedded medical imaging environments.