Abstract:The diffusion property of image encryption algorithms in block-and-permutation mode is investigated, where two new conceptions, the optimal diffusion and ‘collision-free’ permutation are put forward. An image encryption algorithm in block-and-permutation mode fulfills the requirement of optimal diffusion when the global diffusion is achieved within the ideally least round, which is feasible if and only if the permutation is ‘collision-free’. Further more, a permutation algorithm based on quadtree structure is proposed, which is proved to fulfill the requirement of the optimal diffusein.
周庆, 胡月, 廖晓峰. 分组排列模式下图像加密算法的扩散性能分析与实现[J]. 电子与信息学报, 2010, 32(8): 2015-2018.
Zhou Qing, Hu Yue, Liao Xiao-Feng. Analysis of the Diffusion Property of Image Encryption Algorithm in Block-and-Permutation Mode and Its Implementation. , 2010, 32(8): 2015-2018.