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比特全局置乱下的超混沌图像加密算法

发表时间:2016-11-30  浏览量:1425  下载量:299
全部作者: 绽琨,魏东
作者单位: 兰州大学信息科学与工程学院
摘 要: 针对当前流行的混沌图像加密算法存在的安全缺陷问题,研究提出一种鲁棒性更好的图像加密算法。首先,由超混沌系统迭代生成的混沌值构造生成密钥序列;其次,利用混沌密钥序列实现明文图像的比特全局置乱与像素替代;最后,对图像进行两轮扩散加密操作,使得密钥、明文和密文之间的关系更加复杂。理论分析和仿真结果表明,该算法具有良好的统计特性、差分特性等密码学特性,特别是具有较好的鲁棒性。
关 键 词: 图像处理;超混沌;图像加密;比特置乱;像素替代;密文扩散
Title: A hyper-chaotic image encryption via bit global scrambling
Author: ZHAN Kun, WEI Dong
Organization: School of Information Science & Engineering, Lanzhou University
Abstract: In this paper, as the current popular chaos-based image encryption algorithms have security flaw of no immunity to attack, a better robust image encryption algorithm based on hyper-chaos is proposed. Firstly, the algorithm uses hyper-chaotic map to generate key streams. Secondly, it uses hyper-chaotic key streams to achieve bit globally scrambling and pixel replacement. Lastly, it takes two rounds of diffusion cryptographic operations. The relationships between the key, plain-text and cipher-text are more complicated. Theoretical analysis and simulation results show that the algorithm can obtain better cryptographic properties, such as statistical characteristics, difference characteristics and so on. Especially, it has very good robustness.
Key words: image processing; hyper-chaos; image encryption; bit scrambling; pixel substitution; cipher-text diffusion
发表期数: 2016年11月第22期
引用格式: 绽琨,魏东. 比特全局置乱下的超混沌图像加密算法[J]. 中国科技论文在线精品论文,2016,9(22):2327-2336.
 
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