Outguess隐写算法及其安全性研究.docVIP

PAGE 8 Outguess隐写算法及其安全性研究 摘 要 随着Internet越来越广泛的应用，信息安全问题也显得越来越重要。隐写术作为一种新的必威体育官网网址通信手段，受到了众多研究者的关注。而JPEG图像是目前在Internet网上应用最为广泛的图像格式之一，以JPEG 为隐蔽载体的隐写算法及其安全性研究具有非常重要的意义。 本文主要研究如何运用现有的图像处理方法来提高以JPEG图像为载体的Outguess算法的安全性。本文的主要工作如下： （1）对Outguess隐写算法的安全性进行了深入研究。通过运用ETM (Empirical Transition Matrix) 检测算法对Outguess算法的安全性进行了详细的测试。 （2）寻找一些新的方法来提高Outguess的安全性。利用现有的图象处理方法，如锐化、模糊、加噪等方式，在不影响图象质量的情况下的能降低加密图象的被检测效率。实验结果表明，通过对原始图像进行加噪处理，可以有效地提高Outguess算法地安全性，降低ETM算法的检测率。 关键词： 隐写术；检测；Outguess; 信息安全；JPEG； Abstract With the rapid development of Internet, the information security becomes more and more important. As a new technology of secret communication, the digital steganogrophy have attracted much attention of the researches. Since the JPEG image is by far the most common image format in use today, the JPEG steganography and its security is very important. In this paper, we main studied how to improved the security performance of Outguess which is a JPEG steganography through image processing technologies. The main work of this paper is as follows. (1) We have studied the security performance of Outguess. The ETM (Empirical Transition Matrix) detection algorithm is adopted in our experiments to evaluate the security performance of Outguess. (2) We have tried to find some new way to improve the security of Outguess. For example, the image processing technologies such as sharpening, blurring,and adding noise etc have been used in our various experiments. The experimental results demonstrate that the security performance of Outguess can be improved through adding noise to the original carrier image, and also the detection rates of ETM can be lowered to some extent. Key words: steganography; detection; Outguess; information security; JPEG; 目 录 TOC \o 1-3 第一章 前言 1 1.1 信息隐藏技术的背景与意义 1 1.2 信息隐藏技术简介 2 1.3 信息隐藏的检测技术简介 5 第二章 图象信息隐藏与检测研究过程 8 2.1 基于JPEG图象的信息隐藏体系 8 2.2 OutGuess密写算法理论体系 10 2.3 基于SVM的JPEG图象隐秘分析 13 2.3.1 SVM 分类器原理简述 13 2.3.2 SVM 分类流程 15 第三章 基于Outguess算法的图象信息隐藏实验研究 16 3.1