Progressive color visual cryptography

Visual Cryptography Using Color Images

Information security has become a major issue as information technology is ruling the world. Cryptography using mathematical techniques is providing information security but requires complex algorithms, intensive mathematical computations and efficient computational resources. To avoid such intensive and complex algorithms a new scheme known as Visual cryptography (VC) was introduced by Naor an...

Progressive Color Visual Cryptography ( Final version of the manuscript ID : JEI 03158 )

Visual cryptography is a powerful technique which combines the notions of perfect ciphers and secret sharing in cryptography with that of raster graphics. A binary image can be divided into shares which can be stacked together to approximately recover the original image. Unfortunately, it has not been used much primarily because the decryption process entails a severe degradation in image quali...

Contrast Enhancement in Color Extended Visual Cryptography

Visual cryptography is a secret sharing technique mainly used for image sharing. In the case of extended visual cryptography we use meaningful shares to hide image. Contrast loss in decrypted image is a major problem. Here we use Additional basis matrix and perfect white pixel reconstruction to improve the contrast in color extended visual cryptography. Keywords— Visual Cryptography (VC), Halft...

A Secure Visual Cryptography for Color Images

-A visual cryptography scheme is a secret sharing scheme to encode a secret image SI in such a way that any qualified subset of participants can ―visually‖ recover the secret image, while forbidden subsets have no information on SI. A ―visual‖ recovery consists of xeroxing the shares, which are shadow images, onto transparencies and stacking them one on the top of the others. The participants i...

A Report On Progressive Visual Cryptography with Unexpanded Shares Authors