像素位置与比特双重置乱的图像混沌加密算法

doi:10.3969/j.issn.1000-436x.2014.03.025

Abstract

Abstract:

As the current popular chaos-based image encryption algorithms with the permutation–diffusion structure have security flaws of no immunity to attack.A new image encryption algorithm was proposed based on the analysis of current algorithms,which can well resist the chosen-plaintext and the chosen-ciphertext attacks.The algorithm uses Kent chaotic map to generate key streams,and produces the parameters of the chaotic system and the iteration times according to the characteristics of plaintext pixels and input key.Firstly,the positions of pixels were shuffled totally with the chaotic sequence.Secondly,the 0 and 1 bit positions of image pixels were scrambled by using another chaotic sequence generated by the input key.The experimental results show that the algorithm cannot only resist the chosen plaintext attack and chosen ciphertext attack but also achieve better cryptographic properties,such as key space,statistical analysis.

Key words: image encryption, chaotic system, pixels scrambling, bit scrambling

Xiao-heng DENG,Chun-long LIAO,Cong-xu ZHU,Zhi-gang CHEN. Image encryption algorithms based on chaos through dual scrambling of pixel position and bit[J]. Journal on Communications, 2014, 35(3): 216-223.

Figures/Tables 9

References 25

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方向	原始图像	加密图像	文献[2]	文献[9]	文献[10]	文献[15]	文献[22]	文献[23]	文献[24]	文献[25]
水平	0.945 0	0.001 7	?0.014 2	0.020 4	0.024 2	0.000 8	0.081 5	0.011 7	0.012 7	?0.002 9
垂直	0.970 4	?0.000 3	?0.007 4	0.001 74	0.019 4	0.003 7	0.040 0	0.002 6	0.019 0	?0.015 0
对角	0.924 7	0.000 1	?0.018 3	?0.023 1	0.002 4	?0.000 2	0.004 7	0.001 0	0.001 2	0.012 9

初始密钥	本文算法		文献[15]算法
初始密钥	NPCR	UACI	NPCR	UACI
(0.123 456 789 1,0.23)	0.996 2	0.334 7	0.996 0	0.334 1
(0.123 456 789 2,0.23)	0.996 4	0.335 3	0.996 2	0.334 8
(0.123 456 789 1,0.23+10^?10)	0.996 2	0.335 7	0.996 0	0.334 6
(0.123 456 789 1,0.23+2×10^?10)	0.995 8	0.334 6	0.996 2	0.334 7

Image encryption algorithms based on chaos through dual scrambling of pixel position and bit

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