基于IWT和最低有效位替换的视频隐写算法

A video steganography algorithm based on IWT and least significant bit replacement

为了更好地增强加密通信的安全性和鲁棒性,提出一种基于整数小波变换(IWT)和最低有效位(LSB)替换的视频隐写算法,该算法可以对红绿蓝(RGB)三色构成的视频文件进行数据隐藏和提取。隐写过程首先将覆盖视频划分为8×8的RGB图像块,加密数据转化为二进制形式的文本;然后在覆盖视频上执行Haar IWT以获取IWT系数;最后,将二进制文本嵌入到IWT系数的LSBs中。其中数据隐藏的反向过程用于提取隐写视频中的嵌入文本。采用音频视频交错(AVI)文件执行本文算法,实验结果表明,本算法的失真最低。

In order to enhance the security of encrypted communication and robustness, an integer wavelet transform （IWT） and the least significant bit（LSB） replacement based video steganography algorithm is proposed, which can hide and extract video dates com- posed of the three primary colors red, green and blue. Steganography process is as follows： firstly, covered video frames are divided into 8× 8 RGB blocks, and the encrypted data are turned into binary formation. Then, IWT coefficients are obtained by executing Haar IWT on covered video frames. Finally, binary data are embedded into ISBs of IWT coefficients. In addition, the reverse pro- cess of data hiding is used to extract the hidden steganography video embedded text. The proposed algorithm is implemented using Audio Video Interleave（AVI） files. Experimental results show that the distortion of the proposed algorithm is the lowest.