基于二次残数的秘密图像共享

Chang-Chu Chen, Chinchen Chang
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引用次数: 19

摘要

秘密图像共享是一种通过将秘密图像分割成多个单独传输和存储的阴影图像来保护图像的技术。在本文提出的方案中,使用二次残数对秘密图像的每个像素进行加密,并将密文分割成两个字节,共享到两个阴影图像中。根据灰度图像的限制,我们设计了两种方法,即有损法和无损法。实验结果表明,该方法能够保持阴影图像的大小,达到较高的PSNR值。无损方法放大阴影图像以保存溢出信息。此外,由于存在二次残差,很难找到对合数取模的平方根,因此该方案实现了图像传输的保密性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Secret Image Sharing Using Quadratic Residues
Secret image sharing is a technique for protecting image by splitting secret image into many shadow images that are transmitted and stored separately. In the scheme proposed in this paper, each pixel of secret image is encrypted using quadratic residues, and the cipher text is split into two bytes which are shared into two shadow images. According to the restriction of grey level images, we design two methods, namely lossy method and lossless method. The lossy method maintains the size of shadow images and the experimental results show that this method achieves high PSNR values. The lossless method enlarges shadow images to hold the overflow information. Furthermore, with quadratic residues, it is difficult to find square roots modulo a composite number, so the proposed scheme achieves image transmission secrecy.
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