OCML-based colour image encryption
OCML-based colour image encryption
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DOI：
10.1016/j.chaos.2007.07.083
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发表时间：
2009-04-15
影响因子：
7.8
通讯作者：
Belghith, Safya
中科院分区：
文献类型：
--
作者：
Rhouma, Rhouma;Meherzi, Soumaya;Belghith, Safya
基于混沌的密码算法为图像加密提供了新的思路。虽然大多数这些计划是基于低维混沌映射，最近已经提出使用高维混沌，即时空混沌，这是由单向耦合映射格子（OCML）建模。由于其超混沌行为，这样的系统被认为是提高密码系统的安全性。本文提出了一种基于OCML的彩色图像流密码加密方案。我们使用一个192位长的外部密钥来生成OCML的初始条件和参数。我们已经做了几个测试，以检查所提出的密码系统的安全性，即，统计测试，包括直方图分析，演算相邻像素的相关系数，对差分攻击的安全性测试，包括演算的像素变化率（NPCR）和统一的平均变化强度（UACI）的数量，和熵演算。对密码体制的速度进行了分析和测试。(C)2007爱思唯尔有限公司保留所有权利。
The chaos-based cryptographic algorithms have suggested some new ways to develop efficient image-encryption schemes. While most of these schemes are based on low-dimensional chaotic maps, it has been proposed recently to use high-dimensional chaos namely spatiotemporal chaos, which is modelled by one-way coupled-map lattices (OCML). Owing to their hyperchaotic behaviour, such systems are assumed to enhance the cryptosystem security. In this paper, we propose an OCML-based colour image encryption scheme with a stream cipher structure. We use a 192-bit-long external key to generate the initial conditions and the parameters of the OCML. We have made several tests to check the security of the proposed cryptosystem namely, statistical tests including histogram analysis, calculus of the correlation coefficients of adjacent pixels, security test against differential attack including Calculus of the number of pixel change rate (NPCR) and unified average changing intensity (UACI), and entropy calculus. The cryptosystem speed is analyzed and tested as well. (C) 2007 Elsevier Ltd. All rights reserved.