密码学结业论文.doc

课程名称:密码学任课老师:王邦菊班级:信息 1002 姓名:袁佩佩学号: 20********** 华中农业大学理学院信息与计算科学课程论文基于 DCT 数字水印算法的探究袁佩佩摘要: 数字水印技术近年来得到了较大的发展, 基于变换域的水印技术是目前研究的热点。本文探究关于 DCT 变域上的数字水印算法。首先, 采用 Arnold 变换对水印图像进行置乱; 然后利用 DCT 算法嵌入水印信息; 最后, 对算法进行了仿真实验。结果表明, 基于 DCT 变换域的数字水印算法具有较好的保密性能, 能保证水印的不可见性,并保持较好的鲁棒性, 从而实现了图像载体数字文献的版权保护。关键词: Arnold 变换; DCT 算法 Research on Digital watermarking Algorithm Based On DC T Peipei Yua n Abstract : Digital watermarking technology has greatly developed in recent years. Watermarking technology based on transform domain is extremely hot. Digital watermarking algorithm based on DCT transform domain is explored in this paper. First of all, the image issc rambl ed through the Arnold transformation of watermark. Then, watermark is embedded by using DCT algorithm. Finally, the algorithm simulation experiment is carried out. As a result, it is shown that this digital watermarking algorithm has a better performance, which illustrates that not only watermarking algorithm invisibility can be ensured but also good robustness can be maintained, Consequently, the carrier image copyright protection of digital documents is realized. Keywords: Arnold transformation ; DCT algorithm ; 引言近年来, 随着计算机网络和数字多媒体技术的不断发展和进步, 越来越多的数字多媒体信息可以方便、快捷地在网络上进行传播,这给人们的生活带来了极大的方便。但是数字产品非法拷贝、伪造和篡改等, 严重侵犯了单位或个人的知识产权。因此数字产品的版权保护成为一个迫切需要解决的问题,因此也出现了信息隐藏技术。信息隐藏( Information Hiding ) 主要研究如何将某一机密信息隐藏于另一公开信息中, 通过对公开信息的传输来传送