Visual Cryptography Schemes with Reversing
Visual Cryptography Schemes with Reversing
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DOI：
10.1093/comjnl/bxm118
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发表时间：
2008-11
期刊：
影响因子：
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通讯作者：
Ching-Nung Yang;Chung-Chun Wang;Tse-Shih Chen
中科院分区：
文献类型：
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作者：
Ching-Nung Yang;Chung-Chun Wang;Tse-Shih Chen
视觉加密方案（VCS）是一种完美的安全方法，通过将秘密图像分解为影子图像来对其进行加密。 VCS 的一个显着特性是，无需计算即可通过叠加阴影图像来直观地解码秘密。然而，重建图像的大部分对比度都丢失了。 Viet 和 Kurosawa 最近提出了一种不同类型的 VCS，称为带反转的 VCS，允许参与者对阴影图像执行反转操作（反转黑白）。 Viet-Kurosawa VCS 的两个缺点是：（1）只能重建几乎理想的对比度图像，但不能重建理想的对比度图像；（2）Viet-Kurosawa VCS 仅由完美的黑色 VCS 构建。本文展示了真正完美的对比度 VCS，无论使用哪种 VCS（完美黑色或非完美黑色），黑色和白色像素都可以在有限运行内完美重建。
The Visual cryptography scheme (VCS) is a perfect secure method that encrypts a secret image by breaking it into shadow images. A distinctive property of VCS is that one can visually, without computation, decode the secret by superimposing shadow images. However, much of the contrast of the reconstructed image is lost. A different kind of VCS has been recently proposed by Viet and Kurosawa, called VCS with reversing, allowing participants to perform a reversing operation (reverse black and white) on shadow images. Two drawbacks of the Viet–Kurosawa VCS are: (1) one can only reconstruct an almost ideal contrast image but not an ideal contrast image and (2) the Viet–Kurosawa VCS is constructed just from a perfect black VCS. This paper shows a real perfect contrast VCS such that the black and white pixels are perfectly reconstructed within finite runs, no matter what VCS (perfect black or non-perfect black) is used.