【作者】 谭菲；

【导师】 廖少俊；

【作者基本信息】 西安科技大学 ， 计算机应用技术， 2011， 硕士

【摘要】 随着网络和现代通信技术的飞速发展,信息隐藏技术已经成为信息安全领域一个新的研究热点。其原理是利用载体中存在的冗余信息来隐藏秘密信息。它通过隐藏通信过程的存在来获得通信的安全。作为信息安全的新领域,信息隐藏在隐蔽通信和版权保护方面发挥着越来越重要的作用,尤其在军事和国家安全等对信息的安全性和机密性有更高要求的领域,信息隐藏技术的应用前景更是广阔。本文研究的是以数字图像为载体的信息隐藏技术,主要从以下几个方面进行分析与研究。文中首先介绍了信息隐藏技术的基本理论及数字图像的基本知识,并简单介绍了信息隐藏技术中的主要算法;接着分析和介绍了对信息进行预处理的加密技术,加密技术和隐藏技术的结合可以更好的保障信息安全,该部分主要包括对加密与信息隐藏的关系的分析以及对文本信息加密算法RSA和图像置乱算法Arnold进行的研究与实现;然后重点研究了空间域信息隐藏算法,结合空间域视觉模型,对传统的LSB算法进行改进,改进的算法通过随机序列选择嵌入位置,提高了算法的安全性,参考亮度公式来改变载体图像RGB分量的不同位数,在保持好的感知性的同时提高了隐藏率,并对改进后的算法进行了系统实现及结果分析,结果表明该算法隐藏容量大且隐藏效果好;最后,对频域算法进行了研究,并仿真了一种基于DWT的频域信息隐藏算法,对仿真结果进行了分析,结果表明了该算法的有效性和较好的鲁棒性。更多还原

【Abstract】 With the rapid development of Internet and the modern telecommunication technology, information hiding technology has become a new hot topic in the domain of information security. The principle of information hiding technology is embedding private messages in the redundant information of the carrier. It gets the security of communications through hiding the existence of the communication process. As a new domain of information security, information hiding plays a more and more important role in covert communication and copyright protection, especially in the domain of military affairs and national security which have higher requirements on the confidentiality and security of information.This paper studies on the information hiding technology using digital image as the carrier and focuses on the following aspects to analyze and research. This paper first introduces basic theory of information hiding technology and basic knowledge of the digital image. Also,the main algorithms of information hiding technology are simply introduced. Subsequently, the paper analyzes and discusses the encryption technology which is used to pretreat information. The combination of encryption technology and information hiding technology can better guarantee information security. This part is mainly about the analysis of the relationship between information hiding and encryption, as well as the research and implementation of text information encryption algorithm RSA and image scrambling algorithm Arnold. Then the paper focuses on spatial domain algorithm and the traditional information hiding algorithm Least Significant Bit (LSB) is improved associated the spatial domain visual model. The improved algorithm embeds information in the random sequence position to improve the security of information hiding algorithm and change different digits of carrier images RGB component according to the brightness formula in keeping the good apperceiveness while improving the hidden rate. Also,the information hiding system of improved algorithm was implemented and the experimental results were analyzed, the results showed that the algorithm had large hidden capacity and the hidden effect was good. Finally, the frequency-domain algorithm is studied and a kind of hiding information algorithm of frequency domain based on Discrete Wavelet Transform (DWT) is simulated. The simulation results were analyzed and the results verified that the algorithm is effective and robust.更多还原