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<p>Thumbnail-Preserving Encryption (TPE) is crucial for secure and efficient image preview in cloud and Internet of Things (IoT) environments, yet existing JPEG-TPE schemes are constrained by a persistent trilemma: excessive file-size expansion, irreversible distortion, and insufficient security. This paper proposes TPE-DDR, a JPEG-compatible thumbnail-preserving encryption framework that combines a tri-difference DC redistribution strategy, a newly designed 2D Coupled Cosine Hyperbolic and Sine (2D-CCHS) hyperchaotic map, and histogram-shifting-based reversible data hiding (HS-RDH). Extensive experiments show that TPE-DDR achieves an average thumbnail PSNR above 54 dB with an average file-size expansion of 1.91 %, while maintaining lossless decryption, full JPEG compatibility, and clear advantages over existing JPEG-TPE methods in thumbnail quality, compression efficiency, and security. These results demonstrate that TPE-DDR provides a practical, high-performance solution for JPEG thumbnail-preserving encryption.</p>

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TPE-DDR: Thumbnail-Preserving Encryption based on DC-Difference redistribution and 2D-CCHS for JPEG images

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Jinsheng Yuan,
  • Xiuli Chai,
  • Lvchen Cao,
  • Xiuming Zhao,
  • Xianghui Lai

摘要

Thumbnail-Preserving Encryption (TPE) is crucial for secure and efficient image preview in cloud and Internet of Things (IoT) environments, yet existing JPEG-TPE schemes are constrained by a persistent trilemma: excessive file-size expansion, irreversible distortion, and insufficient security. This paper proposes TPE-DDR, a JPEG-compatible thumbnail-preserving encryption framework that combines a tri-difference DC redistribution strategy, a newly designed 2D Coupled Cosine Hyperbolic and Sine (2D-CCHS) hyperchaotic map, and histogram-shifting-based reversible data hiding (HS-RDH). Extensive experiments show that TPE-DDR achieves an average thumbnail PSNR above 54 dB with an average file-size expansion of 1.91 %, while maintaining lossless decryption, full JPEG compatibility, and clear advantages over existing JPEG-TPE methods in thumbnail quality, compression efficiency, and security. These results demonstrate that TPE-DDR provides a practical, high-performance solution for JPEG thumbnail-preserving encryption.