Robust Algorithm to Design Host, watermark Image using Visual Cryptography on Color Image

Abstract

Visual Cryptography (VC) is a method of encrypting a secret image into shares such that stacking a sufficient number of shares reveals the secret image. During the past decade, with the development of information digitalization and internet, digital media increasingly predominate over traditional analog media. Watermarking is the technique of embedding a secret image into a cover image without affecting its perceptual quality so that secret image can be revealed by some process. Watermarking is the technique of embedding a secret image into a cover image without affecting its perceptual quality so that secret image can be revealed by some process. Share generation for the visual cryptography can also be done using watermarking technique. We can use these watermarked shares for retrieving the hidden information. This effort can generate the meaningful shares rather than some shares having no information.

Keyword- cryptography, encryption, digital watermarking, host image, spatial domain, predictive coding, patch work, wavelet, discrete cosine transform.