一种针对彩色JPEG图像的安全隐写算法

A Secure Steganography for Colour JPEG Image

为进一步增强载密彩色JPEG图像的安全性,提出一种针对彩色JPEG图像的安全隐写算法.算法把原始彩色JPEG图像的每个8×8分块进行DCT变换后,对各块中具有相同频率的R,G,B各分量的AC系数用密钥控制生成一个近似服从高斯分布的整数序列进行整除取余,将余数的LSB构成序列brbgbb,对brbgbb采用矩阵编码嵌入秘密信息.实验结果表明:与同类算法相比,该方法对彩色JPEG图像可提供较大的嵌入容量,载密彩色JPEG图像具有较好的视觉质量,且能够抵几种常见的隐写分析方法.

To enhance further the security of the colour JPEG stego-image, a secure steganography for colour JPEG image is proposed. In DCT domain of colour JPEG image, first of all, this steganography selects 8 × 8 sub- block, the quantized AC coefficients having same frequency of R, G, B component in each selected 8 × 8 sub- block are disposed by modulus operator with an integer gaussian sequence. Then embed secret information in the brbgbb sequence which consists of the least significant bit by using matrix coding technology. The experimental results show that the proposed new steganography has achieved the hiding capacity remarkably, while enhancing the visual quality of the JPEG stego-image, and can be resistant several well-known steganalytic methods.