A Secure and Verifiable Visual Cryptography for Color Images

Confidentiality is the most important aspect of information security. Visual Cryptography (VC) is a decryption-less cryptographic technique where human eye is proficient in decrypting the secret information. VC is implemented for binary, gray scale and color images, Color image VC schemes are commonly implemented using Cyan-Magenta-Yellow-Black (CMYK) model that requires a computational device for revealing the secret image but lacks verifiability of the shares. The authenticity of the shares is not assured to the receiver, particularly in color image VC scheme. In case of any alteration, attack or loss in the transmitted data, it cannot be identified by the existing schemes. Unlike the existing models where a device is compulsory for decrypting back color images, the proposed model provides a means to encrypt the color images using Red-Green-Blue (RGB) model where each pixel is processed by its respective RGB components. It enables decryption at the receiver without the assistance of computer or aided devices. In this paper, the above mentioned issues are addressed by the scheme that verifies the integrity of the received shares at the receiver.