计算机科学 ›› 2019, Vol. 46 ›› Issue (11A): 483-487.

• 信息安全 • 上一篇    下一篇

超混沌彩色图像加密算法优化及安全性分析

赵方正1, 李成海2, 刘晨2, 宋亚飞2   

  1. (空军工程大学研究生院 西安700051)1;
    (空军工程大学防空反导学院 西安700051)2
  • 出版日期:2019-11-10 发布日期:2019-11-20
  • 通讯作者: 赵方正(1994-),女,硕士生,主要研究方向为图像加密、网络信息安全,E-mail:zhaofz1020@163.com。
  • 基金资助:
    本文受中国博士后科学基金(2016M602996),国家自然科学基金青年科学基金项目(61703426)资助。

Security Analysis and Optimization of Hyper-chaotic Color Image Encryption Algorithm

ZHAO Fang-zheng1, LI Cheng-hai2, LIU Chen2, SONG Ya-fei2   

  1. (Graduate College,Air Force Engineering University,Xi’an 700051,China)1;
    (Air and Missile Defense College,Air Force Engineering University,Xi’an 700051,China)2
  • Online:2019-11-10 Published:2019-11-20

摘要: 针对当前“置乱-扩散”模式的彩色图像加密算法所存在的密钥空间小、加密过程繁琐以及安全性不足等问题,文中基于超混沌系统提出了一种采用“转换-置乱-扩散”模式的超混沌系统彩色图像加密算法。该算法在进行置乱操作前,首先根据图像自身属性计算其迭代次数,对彩色图像的所有像素值进行格雷码迭代转换,然后将四维超混沌系统产生的混沌序列和转换为格雷码的像素矩阵转换为一维矩阵,对混沌序列进行排序,对像素矩阵进行同步位置变化完成图像的全域置乱,对置乱后的矩阵进行位操作完成图像扩散,最后通过矩阵变换得到密文。通过仿真实验对密钥敏感性、直方图、信息熵、相关性等评价指标进行计算和分析,并与其他算法进行对比,结果证明加密算法具有较强的抗攻击能力。

关键词: 彩色图像加密, 超混沌系统, 格雷码, 密钥空间, 相邻元素相关性

Abstract: According that the current color image encryption algorithms of “scrambling- diffusion” mode have many problems,such as the small key space,the tedious encryption process,the security vulnerability and so on,this paper proposed a new color image encryption algorithm based on the hyperchaotic system adopting “transforming- scrambling- diffusion” model.Before scrambling,it first caclulates the number of iterations in accordance with the image itself attri-butes,excutes gray code iterative transformation for all the pixel values of color image,then the chaotic sequence generated from the four-dimensional hyper-chaotic system and pixel matrix converted to gray code are transformed to one dimensional matrixes.The former is sorted and the later change correspondingly to complete the image pixel matrix of the whole domain scrambling.And then,bit operation is executed to complete image diffusion,the ciphertext is obtained by matrix transformation.The key sensitivity histogram information entropy correlation and other evaluation indexes are calculated and analyzed through the simulation experiment,and compared with other algorithms,proving that the encryption algorithm has strong anti-attack ability.

Key words: Adjacent element correlation, Color image encryption, Gray code, Hyper-chaotic system, Key space

中图分类号: 

  • TP391
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