利用DNA编码和Lorenz混沌系统的图像加密系统
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摘要
提出了一种基于DNA随机编码与Lorenz混沌映射的图像加密算法.首先将明文图像输入到SHA-256生成摘要信息,利用该摘要信息作为安全密钥输入到Lorenz混沌映射中,产生加密所需的伪随机序列;然后,利用Lorenz混沌序列对图像的像素值进行置换,并随机生成DNA掩码;最后利用DNA运算规则对图像进行DNA随机编码,实现图像加密.理论分析和实验结果证明,经该加密系统加密后的图像相邻像素相关性接近0,信息熵为7.998 715,密钥空间大小为2256,能够抵御统计攻击、暴力攻击、差分攻击等常见的攻击手段,具有很高的安全性.
An image encryption algorithm is proposed based on the DNA random coding combined with Lorenz chaotic map. First, SHA-256 hash of the plain image generates the abstract which is utilized to yield secure keys. Iterating Lorenz chaotic map with the initial parameters based on the secure keys, the pseudonumbers sequences are obtain. Second, the Lorenz chaos sequences are exploited to permute the pixels and yield random DNA masks. Finally, the encrypted-image is randomly encoded with DNA rules. Theoretical analysis and computer simulation indicate that the proposed encryption scheme has low correlation closed to0, information entropy 7.998 715 and 2256 bit key space and assistance to statistical attack, brute-force attack and differential attack. It has high level of security.
An image encryption algorithm is proposed based on the DNA random coding combined with Lorenz chaotic map. First, SHA-256 hash of the plain image generates the abstract which is utilized to yield secure keys. Iterating Lorenz chaotic map with the initial parameters based on the secure keys, the pseudonumbers sequences are obtain. Second, the Lorenz chaos sequences are exploited to permute the pixels and yield random DNA masks. Finally, the encrypted-image is randomly encoded with DNA rules. Theoretical analysis and computer simulation indicate that the proposed encryption scheme has low correlation closed to0, information entropy 7.998 715 and 2256 bit key space and assistance to statistical attack, brute-force attack and differential attack. It has high level of security.
引文
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[11]KULSOOM A, XIAO D, AQEEL U R. An Efficient and Noise Resistive Selective Image Encryption Scheme for Gray Images Based on Chaotic Maps and DNA Complementary Rules[J]. Multimedia tools&applications, 2016, 75(1):1-23.
[2]CHUAN Q,WEI Z,FANG C,et al.Separable reversible data hiding in encrypted images via adaptive embedding strategy with block celection[J].Signal Processing,2018,153(12):109-122.
[3]HAMZA R,MUHAMMAD K,NACHIAPPAN A,et al.Hash based encryption for keyframes of diagnostic hysteroscopy[J].IEEE Access,2017,108(99):1-18.
[4]GEHANI A,LABEAN T,REIF J.DNA-based cryptography[J].Aspects of Molecular Computing,2004,54(456):233-249.
[5]何润民,马俊.SHA-256算法的安全性分析[J].电子设计工程,2014,22(3):31-33.
[6]SEYEDZADEH S M,NOROUZI B,MOSAVI M R,et al.A novel color image encryption algorithm based on spatial permutation and quantum chaotic map[J].Nonlinear Dynamics,2015,81(1/2):1-19.
[7]刘会,金聪.基于量子混沌映射的高效安全的图像加密算法[J].计算机工程与科学,2016,38(11):2227-2233.
[8]LIAO X,ULIAH S.A modified(dual)fusion technique for image encryption using SHA-256 hash and multiple chaotic maps[J].Multimedia Tools&Applications,2016,75(18):11241-11266.
[9]WANG X Y,ZHANG Y Q,ZHAO Y Y.A novel image encryption scheme based on 2-D logistic map and DNA sequence operations[J].Nonlinear Dynamics,2015,82(3):1269-1280.
[10]郭祖华,王辉.最邻近耦合映射格子耦合非线性混沌映射的图像加密算法研究[J].计算机应用与软件, 2015, 32(5):283-287.
[11]KULSOOM A, XIAO D, AQEEL U R. An Efficient and Noise Resistive Selective Image Encryption Scheme for Gray Images Based on Chaotic Maps and DNA Complementary Rules[J]. Multimedia tools&applications, 2016, 75(1):1-23.