An Authentication System For Online Question Paper Delivery using Visual Cryptography

Abstract

Visual Cryptography (VC) can be used for sharing a secret image. The image is distributed among the valid participants in the form of transparencies that are random noise-like images. When the required number of participants superimpose their transparencies, the secret image gets revealed without using any computational power. In this paper, we have proposed an authentication system which uses VC for encrypting the passwords required for downloading and opening the question papers from the server. Two transparencies are created for encrypting two passwords. These transparencies are sent to the internal and external supervisor on their email. To reveal the passwords, both the examiners have to download their transparency and give it as an input to a simple software on a computer, which overlaps them and reveals the passwords. The passwords can also be revealed by physically printing the transparencies and overlapping them. The results are tested using MATLAB.