Research & Publication

Abstract:Visual cryptography scheme is a cryptographic process which allows visual information (e.g. images, printed text, and handwritten notes) to be encrypted in such a way that the decryption can be performed by the human visual system, without the help of computers. There are diverse visual cryptography schemes developed based on different factors like pixel expansion, meaningless or meaningful shares, contrast, security, type of secret image and the number of secret images encrypted. This paper discusses most of the visual cryptography schemes and the performance measures used to evaluate them.