基于非均匀DCT的量化索引调制隐写.doc

第 32 卷第 2 期2010 年 2 月电 子 与 信 息 学 报 第 32 卷第 2 期 2010 年 2 月 电 子 与 信 息 学 报 Journal of Electronics Information Technology Vol.32No.2 Feb. 2010 基于非均匀 DCT 的量化索引调制隐写 艺① 赵险峰② 冯登国② 邓 ① (中国科学技术大学电子工程与信息科学系 合肥 230026) ② (中国科学院软件研究所信息安全国家重点实验室 北京 100190) 摘 要：基于量化索引调制(QIM)的隐写技术正日益受到隐写分析的威胁。该文将通常在 DCT 域隐写的做法改为 在非均匀 DCT 域进行，将参数作为密钥，提出了一种 NDCT-QIM 图像隐写方法。由于在攻击者猜测的域中，嵌 入信号具有扩散性，NDCT-QIM 方法不利于隐写分析对隐写特征的检测，分析和实验表明，它能够更好地抵御基 于梯度能量、直方图及小波统计特征等常用统计量的隐写分析，增强了隐写的隐蔽性。 关键词：信息隐藏；信息安全；图像隐写；非均匀离散余弦变换；量化索引调制 中图分类号：TP309 DOI: 10.3724/SP.J.1146.2008.01399 文献标识码： A 文章编号：1009-5896(2010)02-0323-06 Quantization Index Modulation Steganography Based on the Nonuniform DCT Deng Yi① Zhao Xian-feng② Feng Deng-guo② ① (Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei 230026, China) ② (State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing 100190, China) Abstract: Steganography based on Quantization Index Modulation (QIM) is being increasingly threatened by steganalysis. This paper improves the existing steganographic methods embedding data in Non-uniform Discrete Cosine Transform (NDCT) domain instead of more commonly used Discrete Cosine Transform (DCT) domain, and proposes the NDCT-QIM image steganography which uses the parameters of NDCT as its secret key. Since the embedded signal disperses in the domain guessed by an attacker, the NDCT-QIM method makes steganalysis difficult to detect the characteristics of steganography. The analysis and experiments show that it improves the covertness of embedded signal, and is more resistant to the commonly used steganalysis methods, including those respectively based on testing gradient energy, histogram, wavelet characteristics, etc. Key words: Data hiding; Information security; Image steganography; Non-uniform Discrete Cosine Transform (NDCT); Quantization Index Modu