An Analysis of Extended Visual Cryptography Using with Error Diffusion Half Toning Method

Abstract

Extended visual cryptography allows the printing of meaningful images on transparencies so that it can conceal the very existence of "secret" in the transparencies. There have been a lot of studies to incorporate photograph images into extended visual cryptography. This scheme Visual Secret Sharing Schemes, it generates n transparencies from an original secret image. The transparencies are usually shared by n participants so that each participant is expected to keep one transparency [8]. Half toning is the reprographic technique that simulating to continuous tone imagery from side to side, that use of dots, changeable moreover in the size, shape and space. Error diffusion is a type of half toning in which the quantization residual is distributed to neighboring pixels that have not yet been processed. Its main use is to convert a multi-level image into a binary image, though it has other applications.

Key Word: Cryptography, Image, Pixel, Visual, Halftoining, VSSS, EVCS, GAS.