Analysis of Secret Share Design for Color Image using Visual Cryptography Scheme and Halftone

Visual cryptography encodes a secret binary image (SI) into shares of random binary patterns. If the shares are xeroxed onto transparencies, the secret image can be visually decoded by superimposing a qualified subset of transparencies, but no secret information can be obtained from the superposition of a forbidden subset. The binary patterns of the N shares, however, have no visual meaning and hinder the objectives of visual cryptography. Visual cryptography (VC) is a secret sharing scheme of decomposing a secret image into n transparencies, and the stacking of any t out of n transparencies reveals the secret content. The perfect security condition of VC scheme requires the strict requirement where any t-1 or fewer transparencies cannot extract any information about the secret. A HVC construction method is proposed that can encode a secret halftone image into color halftone shares. The secret image is concurrently embedded into color halftone shares. In the present work CMY color model will be implemented