混沌图像加密工具的设计与实现

发布时间：2018-12-28 11:58

【摘要】：多媒体通信在通信技术快速发展的基础上,逐渐成为人们相互交流的主要方式,其中有着大量的以图像为载体的信息传输。然而随着传输和接收设备的发展,通过通信网络非法获取数据已经变得越来越容易。信息之间的传递经常会吸引各种人为的攻击,包括数据篡改、信息窃取、植入木马与病毒等。图像在网络中的安全传输已经成为一个严峻的难题。图像加解密的复杂程度与文本的加解密有很大的不同。图像本身具有数据量大、冗余性等特点,在进行文本加密过程中,采取的常用算法有RSA、DES等方法,这些方法已经无法满足对图像信息的保密。利用混沌加密的方法,该方法具有伪随机性,能够对初值进行较好的处理,这与混沌加密的扩散和混淆原则具有较大的联系,发挥了混沌加密方法在图像加密中的作用[1]。本文以混沌图像加密为研究对象,实现对图像的保密处理。本文对密码学和混沌系统进行了介绍,对混沌加密在国内外的现状,诠释了混沌加密的基本知识及其原理等。本文主要选用Arnold映射和Logistic映射作为研究对象。通过Arnold映射对图像的像素进行置乱以达到加密图像的目的,而Arnold映射加密图像并不能改变图像的像素值,这就使得加密后的图像还保留原图像的一些特征;所以又利用Logistic映射得到混沌序列进而改变图像的像素值,对图像进一步加密。这两种算法相结合对图像进行处理,保证图像信息的安全。
[Abstract]:Based on the rapid development of communication technology, multimedia communication has gradually become the main way for people to communicate with each other, in which there is a large number of information transmission based on images. However, with the development of transmission and receiving devices, it is becoming easier and easier to obtain data illegally through communication network. The transmission of information often attracts a variety of human attacks, including data tampering, information theft, implantation Trojans and viruses. The secure transmission of images in the network has become a severe problem. The complexity of image encryption and decryption is very different from that of text encryption and decryption. The image itself has the characteristics of large amount of data, redundancy and so on. In the process of text encryption, the commonly used algorithms are RSA,DES, which can not satisfy the confidentiality of image information. By using the chaotic encryption method, the method is pseudo-random and can deal with the initial value well, which is closely related to the diffusion and confusion principle of chaotic encryption, and plays the role of chaotic encryption method in image encryption [1]. In this paper, chaotic image encryption is taken as the research object to realize the image security processing. This paper introduces cryptography and chaotic system, explains the basic knowledge and principle of chaotic encryption at home and abroad. In this paper, Arnold mapping and Logistic mapping are selected as research objects. The pixels of the image are scrambled by Arnold mapping to achieve the purpose of encrypting the image, while the encrypted image of the Arnold map can not change the pixel value of the image, which makes the encrypted image retain some features of the original image. So the chaotic sequence is obtained by Logistic mapping and the pixel value of the image is changed to further encrypt the image. The two algorithms combine to process the image to ensure the security of the image information.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TP391.41;TP309.7

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