Abstract
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.
Highlights
Even with the remarkable advancement in computer technology, human visual system is the most convenient and reliable tool for secret recovery
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
The existing schemes do not have any claim to prove about the integrity of the received message
Summary
Even with the remarkable advancement in computer technology, human visual system is the most convenient and reliable tool for secret recovery. A security guard checks the badge of an employee or a secret agent recovers an urgent secret where no electronic devices are available. To make this possible, Naor and Shamir [2] designed the Visual Cryptography (VC) in which a secret image (printed text, picture, etc.) is encrypted in a secure way such that the secret can be decoded only by the human visual system. The secret agent carries some shares with a pre-determined order while departing and when the head quarter decides to execute a specific order, it sends another share to the agent, and the agent recovers the order.
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