Abstract: Visual cryptography is the method of encrypting secrets in the form of images and reproducing two or more images called shares; the shares on their own do not reveal any secret information. The secret image is reconstructed by stacking the share images manually without any electronic gadgets. Recent researches in visual cryptography are focused towards encrypting color images and embedding the shares into natural cover images which will hide the randomness of traditional shares. Need for verifying the authenticity of the share images used during reconstruction is vital as an inauthentic share will entirely modify the final output. In this study, half toned complement cover share and 2�2 block embedding have been employed to improve the quality of both the share images and the stacked output image. The algorithm also provides a means for verifying the authenticity of shares sans any additional shares. Experimental results of the proposed work shows better improvement than literature.
R. Ramesh Kumar and S. Chandramathi, 2016. Color Visual Cryptography Scheme for Natural Images Using Complement Cover and Share Authentication. Asian Journal of Information Technology, 15: 2656-2662.