基于分组置换的RGB分量独立处理加密方案
A Block-Permutation-Based Encryption Scheme with Independent Processing of RGB Components
摘要：
提出了一种基于块置换的加密方案，用于增强颜色置乱的先加密后压缩（ETC）系统。在将原始图像划分为多个块之后，可以通过四个过程来获得BPBE图像：位置置乱、块旋转/翻转、负-正变换和颜色分量置乱。该方案通过为每个颜色分量分配不同的密钥，在位置置乱、块旋转/翻转和负-正变换中独立地对R、G和B分量进行置乱。传统方案考虑使用JPEG和JPEG 2000的压缩效率，JPEG和JPEG 2000默认地在压缩处理之前需要颜色转换。因此，传统方案在每个处理中相同地对颜色分量进行加扰。相比之下，所提出的方案考虑了基于RGB的压缩，例如JPEG-LS，因此可以增加加扰的程度。由于BPBE图像的更宽的颜色分布，因此可以增加对拼图游戏求解器（JPS）的弹性。此外，抵御蛮干攻击的关键空间也呈指数级增长。此外，与传统方案相比，所提出的方案可以保持JPEG-LS压缩效率。通过实验和分析，验证了该方案的有效性.
英文摘要：
This paper proposes a block-permutation-based encryption (BPBE) scheme for the encryption-then-compression (ETC) system that enhances the color scrambling. A BPBE image can be obtained through four processes, positional scrambling, block rotation/flip, negative-positive transformation, and color component shuffling, after dividing the original image into multiple blocks. The proposed scheme scrambles the R, G, and B components independently in positional scrambling, block rotation/flip, and negative-positive transformation, by assigning different keys to each color component. The conventional scheme considers the compression efficiency using JPEG and JPEG 2000, which need a color conversion before the compression process by default. Therefore, the conventional scheme scrambles the color components identically in each process. In contrast, the proposed scheme takes into account the RGB-based compression, such as JPEG-LS, and thus can increase the extent of the scrambling. The resilience against jigsaw puzzle solver (JPS) can consequently be increased owing to the wider color distribution of the BPBE image. Additionally, the key space for resilience against brute-force attacks has also been expanded exponentially. Furthermore, the proposed scheme can maintain the JPEG-LS compression efficiency compared to the conventional scheme. We confirm the effectiveness of the proposed scheme by experiments and analyses.
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