Color image encryption based on Coupled Nonlinear Chaotic Map
Color image encryption based on Coupled Nonlinear Chaotic Map
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DOI：
10.1016/j.chaos.2009.03.084
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发表时间：
2009-11-15
影响因子：
7.8
通讯作者：
Eftekhari-Moghadam, Amir Masud
中科院分区：
文献类型：
--
作者：
Mazloom, Sahar;Eftekhari-Moghadam, Amir Masud
图像加密不同于文本加密，因为图像本身具有数据量大、像素间相关性强等特点，传统的加密方法很难处理这些特点。混沌映射具有对初始条件敏感和类随机性等优良的密码学特性，吸引了密码学家们的注意力，以开发新的加密算法。尽管一维混沌密码系统存在密钥空间小、安全性差等缺点，但近年来基于混沌系统的图像加密算法的研究越来越多。提出了一种耦合非线性混沌映射CNCM，并利用CNCM提出了一种新的基于混沌的彩色图像加密算法。本文所采用的混沌密码技术是一种具有流密码结构的对称密钥密码技术。为了提高算法的安全性，采用240 bit长的密钥，通过对密钥进行代数变换来产生混沌映射的初始条件和参数。这些变换以及CNCM的非线性和耦合结构增强了密码系统的安全性。为了获得更高的安全性和更高的复杂性，本文将图像的大小和颜色分量引入到密码系统中，从而显著提高了对已知/选择明文攻击的抵抗能力。实验、统计分析和密钥敏感性测试结果表明，该图像加密方案为实时图像加密和传输提供了一种高效、安全的方法。(C)2009爱思唯尔有限公司版权所有。
Image encryption is somehow different from text encryption due to some inherent features of image such as bulk data capacity and high correlation among pixels, which are generally difficult to handle by conventional methods. The desirable cryptographic properties of the chaotic maps such as sensitivity to initial conditions and random-like behavior have attracted the attention of cryptographers to develop new encryption algorithms. Therefore, recent researches of image encryption algorithms have been increasingly based on chaotic systems, though the drawbacks of small key space and weak security in one-dimensional chaotic cryptosystems are obvious. This paper proposes a Coupled Nonlinear Chaotic Map, called CNCM, and a novel chaos-based image encryption algorithm to encrypt color images by using CNCM. The chaotic cryptography technique which used in this paper is a symmetric key cryptography with a stream cipher structure. In order to increase the security of the proposed algorithm, 240 bit-long secret key is used to generate the initial conditions and parameters of the chaotic map by making some algebraic transformations to the key. These transformations as well as the nonlinearity and coupling structure of the CNCM have enhanced the cryptosystem security. For getting higher security and higher complexity, the current paper employs the image size and color components to cryptosystem, thereby significantly increasing the resistance to known/chosen-plaintext attacks. The results of several experimental, statistical analysis and key sensitivity tests show that the proposed image encryption scheme provides an efficient and secure way for real-time image encryption and transmission. (C) 2009 Elsevier Ltd. All rights reserved.