基于随机数的图像信息秘密分享技术

A New Approach of Image Secret Sharing Based on Random Numbers

提出一种不需将象素扩展的图像秘密分享技术,其方法是利用随机数的概念,使投影片上每个象素点的色彩利用随机数的编码技术来产生,当解密后仍可保持所解出的秘密图像的视觉效果,且能达到象素不需扩展的目的。通过制定每张投影片的随机数概率,来控制明暗的对比程度,也即对透光程度(透光率)加以控制,透光程度越高,则图像视觉上愈亮;反之则图像视觉上愈暗。实验结果显示,与其他类型的图像秘密分享机制相比,这个方法的有效性和可行性是值得肯定的。

It proposes algorithms based upon random numbers to resolve this problem. The most significant of our contribution is that the encoded shares would be expanded. That is, the size of encoded shares is the same than that of the original image. We design （n,n）,general access structure and extended image secret sharing schemes for both of the binary and color images. Experimental results demonstrate our feasibility and efficiency of our algorithms. We also analyse the contrast between black and white or among various colors in the reconstructed images produced by our schemes.