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| Analysis of the Diffusion Property of Image Encryption Algorithm in Block-and-Permutation Mode and Its Implementation |
| Zhou Qing Hu Yue Liao Xiao-feng |
| Institution of Computer Science, Chongqing University, Chongqing 400044, China |
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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.
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Received: 10 August 2009
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Corresponding Authors:
Zhou Qing
E-mail: tzhou@cqu.edu.cn
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2010, Vol. 32 
