基于超混沌系统的位级自适应彩色图像加密新算法

doi:10.11896/j.issn.1002-137X.2016.04.027

摘要/Abstract

摘要： 提出一种采用超混沌系统的自适应彩色图像加密算法,在位级进行加密。首先利用陈氏超混沌系统产生的混沌序列对原始彩色图像的R、G、B分量图像进行置乱和扩散,采用自适应加密方法,用高四位的二值图像信息去加密低四位,再用加密后的低四位信息去加密高四位；接着将加密后的三基色分量图像横向排列组合联合加密,降低了三基色分量之间的相关性。加密算法使得密文与明文、密钥之间的关系复杂化,部分密钥依赖于明文,使得算法对明文敏感。对密钥空间、密钥敏感性、直方图、相关性、信息熵、明文敏感性进行测试和分析,结果证明了加密算法安全有效,在图像保密通信中具有较大的应用潜力。

关键词: 保密通信,超混沌系统,自适应,位级,联合加密

Abstract: In the paper,a self-adaptive color image encryption algorithm using the hyperchaotic system was introduced,and we operated it at the bit level.Firstly,chaotic sequences produced by Chen hyperchaotic system are used to confused and diffused R,G,B components of the plain image.Moreover,self-adaptive encryption algorithm is adopted,namely,the higher four bit images are used to encrypt the lower four bit images,and the encrypted lower four bit images are used to encrypt the higher four bit images conversely.Then,the encrypted three base color components are combined horizontally and encrypted simultaneously,and this reduces the correlations of the three base color components.The encryption algorithm makes the relationship between the ciphered image and the plain image,keys more complex,some keys depend on the plain image,and the algorithm is more sensitive to the plain image.Tests and analyses of key space,key sensitivity,image histogram,correlation,information entropy and plain image sensitivity were carried out.The results demonstrate the superior security and high efficiency of the proposed scheme,and the encryption scheme has huge application in image secure communication field.

Key words: Secure communication,Hyperchaotic system,Self-adaptive,Bit level,Combined encryption

柴秀丽,甘志华. 基于超混沌系统的位级自适应彩色图像加密新算法[J]. 计算机科学, 2016, 43(4): 134-139. https://doi.org/10.11896/j.issn.1002-137X.2016.04.027

CHAI Xiu-li and GAN Zhi-hua. New Bit-level Self-adaptive Color Image Encryption Algorithm Based on Hyperchaotic System[J]. Computer Science, 2016, 43(4): 134-139. https://doi.org/10.11896/j.issn.1002-137X.2016.04.027

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