一种具有身份验证能力的(3,3)视觉密码方案

摘要

视觉密码是一种秘密分享技术,其解密过程直接依赖人的视觉系统,而不需要任何密码学知识.该技术把一幅秘密图像分解成n幅分享图像,其中的任意k幅分享图像的叠加可以恢复秘密图像,而少于k幅分享图像的叠加不能获得秘密图像的任何信息.给出了一种具有身份验证能力的(3,3)视觉密码方案,可用于可信任的第三方对其他2个参与者进行身份验证.方案涉及2幅验证图像和一幅秘密图像,2幅验证图像用于验证参与者身份.方案产生3幅分享图像,可信任的第三方持有其中的一幅分享图像,其他2个参与者持有另外2幅.可信任的第三方持有的分享图像和其他2个参与者的分享图像分别叠加产生不同的验证图像.实验证实了所给方案的有效性.%The visual cryptography is a secret sharing technique,for which the secret can be decoded directly by human visual system without any cryptography knowledge.This technique splits a secret image into n shares in such a way that the stacking of any k shares can reveal the secret image but any less than k shares should provide no information.In this paper,a (3,3) visual cryptography scheme has been proposed which may be used for the trusted third party to verify the two other participants.This scheme involves two validation images and a secret image.The validation images are used to verify the participants.The secret image is split into three shares.One of the shares is hold by the trusted third party and the other by the two participants.The trusted third party stacks his/her share with the share of the two other participants respectively and the two different images for participant authentication will be revealed.Experiments show the effectiveness of the proposed (3,3) visual cryptography scheme.