Infrared steganography with individual screening shapes applied to postage stamps with security features

Abstract

Original scientific paper Designing a postage stamp requires positioning of graphic security elements in a limited small format, so the design is made for two states: for the visible spectrum and the infrared spectrum. Individual screening elements are introduced as security elements in the steganography of invisible pictures in the 700 to 1000 nm spectrum. The CMYKIR theory of hiding the infrared message in the picture is extended by mixing process inks with the control of spot twins of the same colour tone in the X0 and X40 states. Two pictures are integrated in the security print; a multicolour picture visible to the naked eye, and another hidden picture visible when illuminated with an IR detecting instrument. The CMYKIR method is joined with the new element's algorithm used for dispersing of the hidden picture's ("Z picture's") fringes. This kind of steganography is applied in the design of postage stamps and it is a new way of securing them. Keywords: CMYKIR separation; individual screen element; infrared design; postage stamps with security features; steganography Steganografija na poštanskoj marci s infracrvenim individualiziranim rasterskim oblicimaIzvorni znanstveni članak Dizajn poštanske marke zahtijeva smještanje grafičkih i zaštitnih elemenata u ograničen mali format pri čemu ni jedan od elemenata ne smije biti zapostavljen. Uvode se individualni rasterski oblici kao element zaštite u steganografiji dvostrukih slika u proširenom vizualnom i infracrvenom spektru od 700 do 1000 nm. Proširuje se CMYKIR teorija skrivanja infracrvene poruke u slici miješanjem procesnih bojila uz kontrolu spot blizanaca tonova u stanju X0 te X40. U sigurnosnom otisku su integrirane dvije slike, višebojna slika vidljiva golim okom, te druga skrivena slika vidljiva aparaturom za infracrveni spektar. CMYKIR metodi pridružuje se algoritam novog rasterskog elementa, koji služi za raspršivanje rubova skrivene slike nazvane "Z slika". Ovaj način steganografije primijenjen je u dizajnu i tisku poštanskih maraka u svrhu njihove zaštite na nov način.Ključne riječi: CMYKIR separacija; individualni rasterski element; infracrveni dizajn; poštanske marke sa sigurnosnim svojstvima; steganografija

Security Methods in the Art and Science using Spectroscopy in the Visual and Near Infrared Range

“…The INFRAREDESIGN processes have been applied to postage stamps with the programming of VZ security printing process [4]. Those graphics are small in format so additionally, through IRD technology, expansion of information in the invisible near infrared spectrum has become available.…”