Grayscale-Based Image Encryption Considering Color Sub-sampling Operation for Encryption-then-Compression Systems
Grayscale-Based Image Encryption Considering Color Sub-sampling Operation for Encryption-then-Compression Systems
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DOI：
10.1109/gcce.2018.8574773
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
Warit Sirichotedumrong;Tatsuya Chuman;H. Kiya
中科院分区：
文献类型：
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作者：
Warit Sirichotedumrong;Tatsuya Chuman;H. Kiya
提出了一种新的基于灰度的块置乱图像加密方案，以增强加密后压缩（EtC）系统的安全性，该系统用于通过不可信的通道提供商安全地传输图像。所提出的方案使得能够使用比传统方案更小的块大小和更多的块数量。即使原始图像具有三个颜色通道，由于使用灰度图像，使用所提出的方案加密的图像包含较少的颜色信息。这些功能增强了针对各种攻击的安全性，例如拼图解算器和暴力攻击。此外，它允许使用颜色子采样，这可以提高压缩性能，尽管加密图像没有颜色信息。在实验中，将加密图像上传到 Facebook 和 Twitter，然后从 Facebook 和 Twitter 下载，结果表明所提出的方案对于 EtC 系统是有效的，同时保持了较高的压缩性能。
A new grayscale-based block scrambling image encryption scheme is presented to enhance the security of Encryption-then-Compression (EtC) systems, which are used to securely transmit images through an untrusted channel provider. The proposed scheme enables the use of a smaller block size and a larger number of blocks than the conventional scheme. Images encrypted using the proposed scheme include less color information due to the use of grayscale images even when the original image has three color channels. These features enhance security against various attacks, such as jigsaw puzzle solver and brute-force attacks. Moreover, it allows the use of color sub-sampling, which can improve the compression performance, although the encrypted images have no color information. In an experiment, encrypted images were uploaded to and then downloaded from Facebook and Twitter, and the results demonstrated that the proposed scheme is effective for EtC systems, while maintaining a high compression performance.