The process of visual cryptography is shown in

" In this thesis, a number of new schemes are presented which address current problems and shortcomings within the area of visual cryptography. Visual cryptography provides a very powerful means by which a secret, in the form of a digital image, can be distributed (encoded) into two or more pieces known as shares. When these shares are xeroxed onto transparencies and superimposed exactly together, the original secret can be recovered (decoded) without the necessity for computation. Traditionally, visual cryptography allows effective and efficient sharing of a single secret between a number of trusted parties. One aspect of the research within this thesis specifically addresses the issues of embedding more than two secrets within a set of two shares. Alignment poses a further problem. The placement of the shares must be specific. In order to ease ali~ent, the techniques developed within this thesis for sharing multiple secrets relaxes this restriction. The result is a scheme in which the shares can be superimposed upon one another in a multitude of positions and alignment styles which enables multiple secret recovery. Applications of visual cryptography are also examined and presented. This is an area within visual cryptography that has had very little attention in terms of research. The primary focus of the work presented within this thesis concentrates on applications of visual cryptography in real world scenarios. For such a simple and effective method of sharing secrets, practical applications are as yet, limited. A number of novel uses for visual cryptography are presented that use theoretical techniques in a practical way.

• Visual Cryptography Matlab• Watermarking Matlab.

In1995, Naor and Shamir proposed a visual cryptography (VC) forbinary images.

Thesis Report On Visual Cryptography

Even though the research of visual cryptography is based on the combination of image processing and cryptography, knowledge of VC authentication related to digital image processing and cryptography has not been fully utilized in the past years.

Master Thesis Visual Cryptography Projects - …

Human Machine Identification Using Visual Cryptography: User and security system makes use of this application to share a secret message. For this the identity of user should be submitted to the system. As this identity helps in discriminating authorized user from unauthorized user.

The implications of the visual cryptography will enable the pixels value of the stego-image to keep their statistic character.
Weintroduce a new digital signature scheme based on the concept ofa non-expansion visual cryptography.

The multi-secret visual cryptography scheme ..

The image cryptography is one of the techniques used in the data security during communication over public domain. In the many researchers are working to make the visual cryptography techniques more robust and secure against the attack. In this paper, we have proposed the visual cryptography in the video with the halftone image as a secrete image. We have used Floyd and Jarvis technique for halftoning. The comparative results of PSNR and RMSE has been given in paper for these two techniques.

In this thesis, the analysis of both visual features and cryptographic features of VC will be presented and utilized to assist VC authentication.

A study on visual cryptography, Master Thesis

The multi-secret visual cryptography scheme (MVCS) allows for the encryption of multiple secret images into a given image area. The previous works on MVCS with probabilistic contrast can not guarantee that every original pixel will be reconstructed correctly. However, MVCS with deterministic contrast can reconstruct every original pixel with simple computation for high-end applications, but they are all simple 2-out-of-2 cases. These drawbacks limit the applicability of MVCSs existed. Based on ringed shares, MVCS with deterministic contrast has been defined in this paper. Furthermore, an (k, n)-MVCS with deterministic contrast, which makes the number of secret images not restricted, is proposed on the basis of the share rotation algorithm and the basis matrices of single secret sharing visual cryptography. Experimental results show that our scheme is the first (k, n)-MVCS with deterministic contrast, which can be applied on any k and n.

An effective method for securely transmitting images is found in the field of Visual Cryptography

Grey Level Visual Cryptography for General Access Structures

...hy, Secret sharing, Visual cryptography, image processing, Hamming weight, Contrast, Access structures, Threshold secret sharing. 1. Introduction Visual cryptography was introduced by Naor and Shamir =-=[1, 2]-=-. They assumed that the image consists of a collection of black and white pixels. Each pixel appears in n versions called shares, one for each transparency. Each share is a collection of m black and w...