基于动态参数控制的混沌系统图像加密算法

计算机科学 ›› 2019, Vol. 46 ›› Issue (11A): 469-472.

基于动态参数控制的混沌系统图像加密算法

王丽娟, 李国东, 吕冬梅

(新疆财经大学统计与数据科学学院乌鲁木齐830012)

出版日期:2019-11-10 发布日期:2019-11-20
通讯作者: 李国东(1972-),男,博士,教授,硕士生导师,主要研究方向为数据挖掘与图像处理,E-mai:lgdzhy@126.com。
作者简介:王丽娟(1994-),女,硕士,主要研究方向为数据挖掘与图像处理,E-mail:1575516311@qq.com。
基金资助:
本文受自治区自然科学基金(2017D01A24)资助。

Chaotic System Image Encryption Algorithm Based on Dynamic Parameter Control

WANG Li-juan, LI Guo-dong, LV Dong-mei

(Xinjiang University of Finance and Economics,School of Statistics and Data Science,Urumqi 830012,China)

Online:2019-11-10 Published:2019-11-20

摘要/Abstract

摘要： 针对单混沌系统结构简单、安全性低、相关性强等问题,提出了一种基于动态参数控制的混沌系统图像加密算法。首先,构造新的混沌系统(LCT)产生混沌序列,并对其进行排序得到一组序列,对原始位置进行索引,得到一组位置索引序列,将图像矩阵按照得到的索引位置序列进行置乱;其次,应用henon混沌映射得到的两个混沌序列,设计了一种新的产生伪随机序列的方法,得到一个新的混沌序列,并将其与得到的置乱图像进行异或处理,从而得到最终的密文图像。实验结果表明:密文图像与明文图像的相关性较小;任取明文图像的两个像素值,其NPCR 与 UACI 的测试值分别为99.6414%,99.6380%和33.3869%,33.3852%,较接近理论值;明文图像熵值为 7.4416,密文图像熵值为7.9889。因此,该算法具有较强的鲁棒性、可靠的安全性,可以有效地提高加密系统的各种抗攻击能力。

关键词: henon混沌系统, LCT混沌系统, 索引序列, 图像加密

Abstract: To solve the problems of simple structure,low security and strong correlation of single chaotic system,a ch-aotic system image encryption algorithm based on dynamic parameter control was proposed.Firstly,a new chaotic system (LCT) is constructed to generate chaotic sequences,which are sorted to get a set of sequences,and the original positions are indexed to get a set of position index sequences,and image moments are obtained.The array is scrambled according to the sequence of index positions obtained.Secondly,a new method of generating pseudo-random sequence is designed by using two chaotic sequences obtained from Henon chaotic map,and a new chaotic sequence is obtained.The new ch-aotic sequence and the scrambled image are XOR processed to obtain the final ciphertext image.Experiment results show that correlation between ciphertext image and plaintext image is small,and the test values of NPCR and UACI are 99.6414%,99.6380% and 33.3869%,33.3852%,respectively for two pixel values of plaintext image,which are close to the theoretical value;the entropy value of plaintext image is 7.4416,and that of ciphertext image is 7.9889.Therefore,the algorithm has strong robustness,reliable security,and can effectively improve the anti-attack ability of encryption system.

Key words: Henon chaotic system, Image encryption, Index sequence, LCT chaotic system

中图分类号:

TP309

王丽娟, 李国东, 吕冬梅. 基于动态参数控制的混沌系统图像加密算法[J]. 计算机科学, 2019, 46(11A): 469-472. https://doi.org/

WANG Li-juan, LI Guo-dong, LV Dong-mei. Chaotic System Image Encryption Algorithm Based on Dynamic Parameter Control[J]. Computer Science, 2019, 46(11A): 469-472. https://doi.org/

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