摘要随着信息技术的发展以及网络应用的越来越普及，每天都有海量数据在网络上传播，其中大约有百分之七十是以数字图像形式体现出来的。现在越来越多用户尤其是青年人乐于通过互联网、无线通信等渠道传播图像，而这些数字图像有很多涉及到个人的隐私。因此，如何保证图像的安全传播，防止被攻击者非法窃取，就自然成为人们广泛关注的问题。而随着计算机科技的不断进步，加密技术也必将向着增强算法保密性、加快图像加密与解密速率以及减少算法的复杂度的目标发展。虽然 、 、 等以现代密码体制为基础的图片加密技术具有加密密钥空间丰富，很难被破解等优点，但是这些加密算法是基于文本加密发展而来的。用这些文本加密算法加密图像，会有加密速度慢，很容易受到区域分析的攻击，在对图像进行加密之前需要对图像数据进行预处理等不足之处。因而会破坏图像原有的样子，使图像变得没有意义，不能完全满足图像加密需要。87720

由于混沌系统的对初始值极度的敏感性，同时又能够重复大量地生成混沌序列，这些特性使得其非常适用于图像的加密，因此，利用混沌技术加密图像受到了广大研究人员的关注。由于混沌理论在图像加密方面独特的优势，数学上关于混沌任何新的研究都将被视为图像加密的一种潜在新技术。本文首先对几种被广泛使用的混沌系统进行讨论，分析其混沌动力学的数学模型。其次提出了基于 映射和一维 映射的一种混合加密技术，给出一种混合系统模型，详细讨论了加密因子的产生方法。并对本模型的密钥空间和安全性进行了阐述，详细分析了加密前后图像之中邻近像素点之间的相关度。从仿真结果看，本文算法的加密效果较为成功。

毕业论文关键词  混沌系统；图像；加密；算法

毕业设计说明书外文摘要

Title  Digital Image Encryption Technology Research Based on Chaos               

Abstract With the development of information technology and the popularity of network applications, there are huge amounts of data to be transmitted on the network every day。 About seventy percent of this information is in the form of digital images。 These digital images have a lot of personal privacy。 So, it is extensively concerned how to ensure the safety of the images transmitted and prevents the attackers to steal illegally。 With the rapid progress in computer technology, the encryption technology will go along the direction of improving the secrecy and encrypting and decrypting image and reducing the complexity of the calculation。 Although DES, IDEA and RSA have advantages including large encryption key spaces and hard cracking, the encryption algorithms are proposed based on the text encryption。 If using the text encryption algorithms to encrypt the images, encryption will be slow and be attacked easily by area analysis and lose the original information of the images。 So these text encryption algorithms can't fully meet the needs of the image encryption。

Because of the extreme sensitivity of chaotic systems to the initial values and the capacity of generating a large number of chaotic sequence。 The chaotic systems are very suitable for image encryption。 Because the unique advantages of chaos theory in image encryption, any new research about chaos technology will be deemed to be a potential new technology of chaos image encryption。 源-于,优Z尔%论^文.网wwW.yOueRw.com 原文+QQ752018~766

This paper discusses several chaotic systems used widely and analyzes the mathematical mode of its chaotic dynamical system。 Then, a mix encryption technology based on Henon map and 1D logistic map and a mix system modal are presented。 Thirdly, we discuss the production way of the encryption factor sequence。 From the simulation results, the algorithm of this paper has better encryption effects。