基于小波变换的两级信息隐藏及其实现

THE INFORMATION HIDING ALGORITHM BASED ON TWO-LEVEL DWT AND ITS REALIZATION

针对信息隐藏中可能出现的第三方发送假的信息的情况,给出了以数字图像作为掩护媒体的基于离散小波变换DWT(Discrete Wavelet Transform)的二级信息隐藏算法。首先将发送方的标志信息隐藏在秘密信息中,然后将秘密信息隐藏在载体图像的中、高频系数中,算法既可以用于隐藏二值图像,也可以隐藏文字信息;既达到了隐藏秘密信息的目的,又能验证信息的真伪。并且检测与提取秘密信息时不需要原载体图像。实验结果表明,算法很好地实现了信息隐藏功能,且具有很高的鲁棒性。

According to the circumstance that false information might be sent by third party during information hiding, an algorithm of two- level information hiding based on discrete wavelet transform （DWT） is proposed, which takes digital image as cover-media. First, the sign of the sender is hidden in secret information, and then the secret information is hidden in middle and high frequency coefficients of carrier image. This algorithm can be used to hide binary image and letter information, the purpose of hiding secret information is attained together with validatiug true and false of the secret information, and there is no need of original carrier image when detecting and extracting secrete information. The results of experiment indicate that the algorithm perfectly implements the information hiding function with high robustness.