Color Visual Cryptography Scheme Using Meaningful Shares

Visual cryptography (VC) schemes hide the secret image into two or more images which are called shares. The secret image can be recovered simply by stacking the shares together without any complex computation involved. The shares are very safe because separately they reveal nothing about the secret image. In this paper, a color visual cryptography scheme producing meaningful shares is proposed. These meaningful shares will not arouse the attention of hackers. The proposed scheme utilizes the halftone technique, cover coding table and secret coding table to generate two meaningful shares. The secret image can be decrypted by stacking the two meaningful shares together. Experimental results have demonstrated that the new scheme is perfectly applicable and achieves a high security level.