Document Abstract
Visual encryption (VC) is dynamic mechanisms associate the concepts of complete password and secret sharing in cryptography same as raster graphics. VC takes a binary picture (secret), then Break it into two or more parts, called stocks. When shares Printed on transparencies and superimposed jointly, the secret can be was refreshed. No computer is compulsory, so it proves one of the unique features of VC. VC is a alone technology In a sense, encrypted messages can be directly Human Visual System (HVS). In this survey, we will summarize since its establishment in 1994, the latest cultivated of visual cryptography, introduce the main research topics in the field and outline the current Problems and possible solutions. The direction and trend of future venture capital also check the work and possible VC applications. 3-D (three dimensions or three-dimensional)