视觉密码方案概述

Overview of visual cryptography scheme

视觉密码(VC)是一种用于分享秘密图像的加密方案,与传统的密码技术相比具有简单性、安全性、隐蔽性等优点。其加密是将图像编码为分享,将分享打印在透明胶片上或以数字形式存储;其解密过程是对分享进行叠加,然后通过人类的视觉能力来实现。本文介绍了视觉密码的基本概念和各种不同的视觉密码方案,以及每种方案中使用的技术。此外,对视觉密码在不同领域上的应用做出了说明。

Visual cryptography(VC)is an encryption scheme for sharing secret images.Compared with traditional cryptography,it has the advantages of simplicity,security and concealment.The encryption is to encode the image for sharing,and to print the sharing on a transparent film or store it in digital form;the decryption process is to superimpose the sharing,and then realize it through human visual ability.This article introduces the basic concepts of visual cryptography and various different visual cryptography schemes,as well as the technology used in each scheme.In addition,the application of visual cryptography in different fields is explained.