An extended construction method for visual secret sharing schemes
Taku Katoh, Hideki Imai · Electronics and Communications in Japan (Part III Fundamental Electronic Science) · 1998
A visual secret sharing scheme [1] permits a secret to be shared among participants using transparencies. In this paper, we consider an extended scheme for visual secret sharing. We propose an improved method of constructing the visual secret sharing scheme that can conceal some images in a series of transparencies, in such a way that different images are seen as the number of stacking transparencies increases. Furthermore, we describe applications of the visual secret sharing scheme to copy machines and human identification schemes. In the identification scheme, users recognize messages from an identification terminal by stacking their transparencies on the display. A great advantage of this scheme is that users can validate the authenticity of the terminal without consulting a computer or calculator. © 1998 Scripta Technica. Electron Comm Jpn Pt 3, 81(7): 55–63, 1998