Title :
3DAS: a 3-dimensional-structure authentication system
Author :
Van Renesse, Rudolf L.
Author_Institution :
TNO Inst. of Appl. Phys., Delft, Netherlands
Abstract :
It has been argued that the degree of microstructural order of an optical security feature is an approximate measure of its practical value for document security. Examples of highly ordered structures are diffractive devices like holograms, kinograms and zero order devices as well as interference devices like multilayer thin films and liquid crystals. An entirely different type of security feature is the random device which combines a complete lack of structural order with a high degree of security. This paper surveys the polarity of ordered and random structures
Keywords :
authorisation; computer-generated holography; holographic optical elements; holographic storage; liquid crystal devices; optical films; security of data; 3D structure authentication system; diffractive optical elements; document security; highly ordered structures; interference devices; kinograms; liquid crystals; microstructural order; multilayer thin films; optical security feature; polarity; random structures; security feature; structural order; zero order devices;
Conference_Titel :
Security and Detection, 1995., European Convention on
Conference_Location :
Brighton
Print_ISBN :
0-85296-640-7
DOI :
10.1049/cp:19950467
