【作者】 张承乾；

【导师】 张春田；

【作者基本信息】 天津大学 ， 信号及信息处理， 2006， 硕士

【摘要】 随着计算机网络技术的飞速发展,以及多媒体信息存储、检索技术、通信传输的不断完善,数字化信息产品已经深入到寻常百姓的生活。人们在享受数字化带来的种种便利的同时,也越来越关注数字产品的版权保护和网络环境下的信息安全问题。信息隐藏技术作为信息安全领域中的一项新技术,为数字产品的版权保护问题提供了新的解决方案。大量消费类数字音视频产品(如VCD、DVD)的推出,又使得针对视频系统的信息隐藏技术成为当前信息隐藏技术研究的一个热点。本文首先介绍了信息隐藏技术的概念、特点、分类以及应用领域;其次针对视频信息隐藏系统的特点,讨论了几种典型的视频信息隐藏算法;然后以LSB数据隐藏算法为例分析信息隐藏的安全性问题;最后在剖析一种典型码流域视频信息隐藏算法的抗统计攻击能力的基础上,提出了一种新型的改进算法,以此提高信息隐藏算法的系统安全性。实验模拟表明,改进后的算法能够有效的弥补原有算法在统计特性上的缺陷,成功地抗击相关的统计分析攻击。更多还原

【Abstract】 With the rapid and extensive development of computer network technique and the gradual improvement of storage, search and communication technique of multimedia information, digital products have become common in our life. We pay more and more attention to the problem of copyright protection of digital products while we enjoy the convenience of digital products. Information hiding as a new technique in information security offers a new way to solve the problem of copyright protection. The appearing of plenty of consuming digital audio and video product, such as VCD, DVD, makes the video information hiding technique a hotspot.In this paper, firstly we introduce the conception, characteristics and category of information hiding and its application. Afterward, according to the characteristics of video information hiding system some typical algorithms are discussed. Analyze the security problem of information hiding taking the LSB algorithm as an example. Finally, on the basis of the anatomy of the ability of a typical algorithm in bit stream resisting statistical attack put forward a new algorithm to improve the security of information hiding algorithm. Experiments show that the new algorithm can succeed in resisting related statistical attack and make up the limitation of the original algorithm.更多还原