Visual Cryptography and Secret Image Sharing

9

Visual Cryptography Schemes with Reversing

Alfredo De Santis, Anna Lisa Ferrara and Barbara Masucci

Università, di Salerno, Italy

CONTENTS

9.1 Introduction

9.2 Visual Cryptography Schemes

9.2.1 (k, k)-Threshold Visual Cryptography Schemes

9.2.2 Perfect Black Visual Cryptography Schemes

9.3 Almost Ideal Contrast VCS with Reversing

9.4 Ideal Contrast VCS with Reversing

9.4.1 A Construction Using a Binary Secret Sharing Scheme

9.4.2 Constructions Using Perfect Black VCSs

9.4.2.1 The Scheme by Cimato, De Santis, Ferrara, and Masucci

9.4.2.2 The Scheme by Hu and Tzeng

9.4.2.3 The Scheme by Yang, Wang, and Chen

9.4.2.4 Comparisons

9.4.3 A Construction Using a Nonperfect Black VCS

9.5 Conclusions

Bibliography

9.1 Introduction

A visual ...