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<p>With the widespread use of smart devices and the accumulation of time, an increasing number of users are choosing to upload images to the cloud. Although traditional image encryption techniques can effectively protect users’ privacy, they significantly hinder the processing of cloud-based image data, thus reducing the convenience of cloud storage. To address this issue, Thumbnail Preserving Encryption (TPE) schemes have emerged. This paper proposes a novel TPE algorithm based on a universal cross-coupled chaotic model combined with an irregular block partitioning strategy. Unlike conventional TPE methods that rely on regular block division—which can be easily inferred and exploited—the irregular partitioning approach conceals spatial structures more effectively, thereby enhancing security. Experimental results show that the proposed two-pixel TPE scheme achieves high key sensitivity, high information entropy, and strong resistance to differential attacks, offering improved security and flexibility in thumbnail-preserving encryption.</p>

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Non-regular thumbnail-preserving encryption based on cross-coupled chaotic model

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月3日

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  • Junbo Li,
  • Lingfeng Liu,
  • Rongqing Lei

摘要

With the widespread use of smart devices and the accumulation of time, an increasing number of users are choosing to upload images to the cloud. Although traditional image encryption techniques can effectively protect users’ privacy, they significantly hinder the processing of cloud-based image data, thus reducing the convenience of cloud storage. To address this issue, Thumbnail Preserving Encryption (TPE) schemes have emerged. This paper proposes a novel TPE algorithm based on a universal cross-coupled chaotic model combined with an irregular block partitioning strategy. Unlike conventional TPE methods that rely on regular block division—which can be easily inferred and exploited—the irregular partitioning approach conceals spatial structures more effectively, thereby enhancing security. Experimental results show that the proposed two-pixel TPE scheme achieves high key sensitivity, high information entropy, and strong resistance to differential attacks, offering improved security and flexibility in thumbnail-preserving encryption.