文档介绍：摘要
着多种信息的,数字的信息安全问题产生了。近年来,图像的传递已成为人们利用网络进行交流和沟通必不可少的方式之一。基于的算法,许多专家学者提出新的和有效的方法来开发安全的图像加密技术。混沌系统已经广泛利用于过去二十年来的加密方法。
因为图像本身具有数据量大、极强的关联性像素和其他特性,传统的加密算法,如IDES,主要是基于离散数学,并不适用于实际的图像加密。基于混沌的加密是依赖的复杂动态非线性系统,它可以提供一个快速和安全的方法用于数据保护的,这是很重要的多媒体数据传输快速的沟通渠道,如宽带互联网通信。而目前广泛使用的单维混沌系统,如Logistic映射,公式简单,计算方便,但在计算精度受限的情况下,存在小和低的缺陷,不足以抵御明文攻击和统计攻击。在这种沟通,我们提出了一种图像方法混沌映射为了满足要求的安全的影像传输。实验仿真表明,该算法不仅有效地扩展了密钥空间,并具有良好的统计特性,同时在加密速度和安全性方面也具有良好的性能。
关键词
混沌序列;Logistic映射;图像加密
Abstract
The security of digital image information has e a serious problem, panied by a variety of the rapid development of information technology. In recent years, the transmission of image has e one of the essential ways which people use municate through the . Image information is not only related to personal privacy, but also related to national security. So it needs to be transmitted in a secure way. Therefore, the research for image encryption technology has practical significance.
Because the image itself has a large quantity of data and there is strong correlation between the pixels and other characteristics, the traditional encryption algorithms such as DES, IDEA does not apply to the actual image encryption. Chaotic systems are periodic and extremely sensitive for initial conditions and system parameters, so that chaotic systems are very suitable for image encryption algorithm of grey value encryption. At present the extensive use of integrated chaotic system, such as the Logistic mapping, the formula is simple and easy to calculate. But in terms of accuracy constraints, the key space is not enough to resist expressly attack and statistical attacks. To the above problems, this paper puts forward an image encryption algorithm based on Logistic mapping, using Logistic equation of the chaotic sequence to produce image encryption. The simulation results show that this algorithm not only effectively expands the key space, and it also has good cryptography performance and good operation efficiency and statistical cha