Document Abstract
Cryptography scheme is now a day most secure techniques for security and protection, that allow the encryption of image or data by transferring it into the secure and protected share and such a scheme is able to recover the secret image or data without any computation devices. In this digital world where we are full of technologies wants to use, transmit and receive our secret image or data in a safe manner. Many number of Cryptography scheme allow encoding the original message to hide its meaning and decode it to reveal the original message.
Also encoding of information in the number of shares and distributed to number of participants, which decrypt information without any cryptographic knowledge. The shares are sent through different communication channels from sender to receiver so that the probability of getting sufficient shares by the intruder minimized. But the shares may arise suspicion to the hacker’s mind that passed information is secret. We can encrypt original image using a key to provide more security to this scheme. This make visual cryptography scheme a completely secure scheme. Visual cryptography scheme is a cryptographic technique which allows visual information (e.g. printed text, handwritten notes, and picture) to be encrypted in such a way that the decryption can be performed by the human visual system, without the aid of computers. There are various measures on which performance of visual cryptography scheme depends, such as pixel expansion, contrast, security, accuracy, computational complexity, share generated is meaningful or meaningless, type of secret images( either binary or color) and number of secret images(either single or multiple) encrypted by the scheme.