Magic sheets: Visual cryptography with common shares

Authenticating Visual Cryptography Shares Using 2D Barcodes

One of the problems pertinent with many visual cryptography (VC) schemes is that of authentication. VC provides a way of sharing secrets between a number of participants. The secrets are in the form of an image that is encoded into multiple pieces known as shares. When these shares are physically superimposed, the secret can be instantly observed. A known problem is that of authentication. How ...

Multi-pixel Visual Cryptography for color images with Meaningful Shares

Visual cryptography technique for black and white images (Basic) introduced by Naor and Shamir [1]. Any visual secret information ( pictures, text, etc) is considered as image and encryption is performed using simple algorithm to generate n copies of shares depending on type of access structure schemes[2, 6].The simplest access structure is the 2 out of 2 scheme where the secret image is encryp...

A Modified Multi-secret Visual Cryptography with Ring Shares

A visual cryptography scheme encoding multiple secret images into two ring shares is proposed in this paper. In the secret sharing process, two shares are produced by the marked areas and the basis matrices of (2, 2)-VCS. Using ring shift right function, the secret images are recovered by stacking two shares. The security and contrast properties of the scheme have been proved. Compared with the...

Visual Cryptography by Random Grids with Identifiable Shares

This paper proposes a visual cryptography by random grids scheme with identifiable shares. The method encodes an image O in two shares that exhibits the following features: (1) each generated share has the same scale as O, (2) any share singly has noise-like appearance that reveals no secret information on O, (3) the secrets can be revealed by superimposing the two shares, (4) folding a share u...

A Report On Progressive Visual Cryptography with Unexpanded Shares Authors