信息隐藏技术的方法研究

【作者】 许永峰；

【导师】 张书玲；

【作者基本信息】 西北大学 ， 计算数学， 2003， 硕士

【摘要】 信息隐藏技术是近年来人们研究的热点之一，其在信息保密、多媒体版权保护方面有着加密技术所不具有的优点，并且与之有着很强的互补性。本文利用小波分析的已有成果，在总结现代密码学理论的基础上，分析了目前信息隐藏技术的理论和各种方法，提出了基于小波变换的信息隐写算法和基于小波变换的数字水印算法。 基于小波变换的信息隐写算法是把水印图象的低频成分嵌入到原始宿主图象的低频部分，其抗攻击能力和隐藏能力强，提取的水印图象质量良好。仿真结果表明该算法是有效的和可行的。 基于小波变换的数字水印算法充分利用了图像经过多分辨分解后低频图像的频率相对平稳特性，并依据嵌入点值与其区域均值的大小，将二维二值水印信息隐藏到嵌入点。实验表明，该算法对诸多攻击具有很好的鲁棒性和安全性。更多还原

【Abstract】 Information hiding technique becomes a research hot-spot in recent years. It overcomes the shortcomings of encrpytion techniques in information security and multimedia authentication, and provides the complementary solution for encrpytion techniques. Based on summarizing modern cryptography theory, this paper, making use of results of DWT, gives an analysis on the current theories and methods of information hiding, and presents Information Steganography Algorithm Based on Wavelet Transform and Digital Watermarking Algorithm Based on Wavelet Transform.Information Steganography Algorithm Based on Wavelet Transform is that low-frequency ingredient of watermark is embedded in low-frequency part of host image . The experimental results show that the advantage of it is high efficiency of resisting the current various attack and data hiding , and that recovering image is good . This technique is reasonable and satisfactory.Digital Watermarking Algorithm Based on Wavelet Transform, making use of relative frequency equability feature of low-frequency that comes from image’s MRA decomposing and according to size between insert point value and its region mean value, is that two-value watermarking is hid in insert point. Experimental results show that the algorithm is robust and security to some watermarking attacks.更多还原