What is Visual Cryptography?

Visual Cryptography is a special encrption technique to hide information in images in such a way that it can be decrypted by human vision if the correct key image is used.

Pictures and text can be encrypted in such a wy that decryption becomes a mechanical operation which need not require a computer

Visual Cryptography uses two transparent images. One image contains random pixels and the other image contains the secret information. It is impossible to retrieve the secret information from one of the images. Both transparent images or layers are required to reveal the information. The easiest way to implement Visual Cryptography is to print the two layers onto a transparent sheet.

Introduction

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