[1]费 敏,李国东.基于混沌系统和双向扩散的图像加密算法[J].计算机技术与发展,2021,31(12):92-97.[doi:10. 3969 / j. issn. 1673-629X. 2021. 12. 016]
　FEI Min,LI Guo-dong.Image Encryption Algorithm Based on Chaotic System and Bidirectional Diffusion[J].,2021,31(12):92-97.[doi:10. 3969 / j. issn. 1673-629X. 2021. 12. 016]
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基于混沌系统和双向扩散的图像加密算法()
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《计算机技术与发展》[ISSN:1006-6977/CN:61-1281/TN]

卷:
31
期数:
2021年12期
页码:
92-97
栏目:
图形与图像
出版日期:
2021-12-10

文章信息/Info

Title:
Image Encryption Algorithm Based on Chaotic System and Bidirectional Diffusion
文章编号:
1673-629X(2021)12-0092-06
作者:
费 敏; 李国东
新疆财经大学 统计与数据科学学院,新疆 乌鲁木齐 830012
Author(s):
FEI Min; LI Guo-dong
School of Statistics and Data Science,Xinjiang University of Finance and Economics,Urumqi 830012,China
关键词:
混沌映射; 明文关联; 双向扩散; 图像加密; 循环移位
Keywords:
chaotic mapping; plaintext correlation; bidirectional diffusion; image encryption; cyclic shift
分类号:
TP309. 7
DOI:
10. 3969 / j. issn. 1673-629X. 2021. 12. 016
摘要:
针对部分图像加密算法与明文无关,安全性差以及加密效率低的问题,设计一种基于分段线性混沌映射且与明文关联的图像加密算法。 首先,将初始值和参数作为密钥,迭代分段线性混沌映射,产生混沌序列;其次,利用产生的混沌序列设计一个混沌密码发生器,产生与明文图像大小相同的 4 个随机矩阵,记作 X、Y、R 和 W,运用 X 矩阵对明文做前向扩散,得到矩阵 A,再运用 R 和 W 矩阵设计一种与明文关联的置乱方法对矩阵 A 进行置乱得到矩阵 B,在置乱的过程中还进行了循环移位操作使加密效果更好;最后运用 Y 矩阵对矩阵 B 做后向扩散,得到呈现噪声样式和不再具有可视信息的最终密文图像。 通过实验仿真证明,该加密算法密钥空间大,密钥敏感性强,信息熵接近理论值 8,抗差分攻击和统计攻击能力强,得到的密文图像相邻像素相关性低,安全性高。
Abstract:
Aiming at the problems of some image encryption algorithms which are independent of plain text, poor security and low encryption efficiency,? ? ?an image encryption algorithm based on piece wise linear chaotic map and associated with plain text is designed.Firstly,the initial values and parameters are used as keys to iterate piece wise linear chaotic maps to generate chaotic sequences. Secondly,a chaotic cipher generator is designed by using the generated chaotic sequences to generate four random matrices with the same size as the plain text image,which are denoted as X , Y , R and W . Then, X is used to do forward diffusion of plain text to obtain A ,and then R and W are used to design a scrambling method associated with plain text to scramble the A and get the B . In the scrambling process,the cyclic shift operation is also carried out to make the encryption effect better. Finally, Y is used to do backward diffusion of B to obtain the final cipher text image which presents noise pattern and no longer has visual information. The experimental simulation shows that the proposed encryption algorithm has large key space,strong key sensitivity,information entropy close to the theoretical value of 8,strong ability to resist differential attacks and statistical attacks,and the adjacent pixels of the cipher text image have low correlation and high security.

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更新日期/Last Update: 2021-12-10