Copy-proof machine-readable holograms for security application

Copy proofmachine readable holograms for security applicationGunther DausmannIrma MenzKlaus GnadigZishac YangHSM Holographic Systems MUnchen GnibHWiegenfeidring 2a, D-85570 Markt Schwaben (Germany)ABSTRACTThe most frequently used optical security features to protect documents and goods against counterfeiting are varioustypes of rainbow holograms and diffractive optical variable devices (OVDs). Although these features offer a fair degreeof security and most known falsifications are rather crude imitations it is still possible to copy them with all hidden andvisible information. In our opinion it would be helpful to have copy proof holograms containing a machine readablefeature to achieve a doubtfree verification at point of sale and other sites.We will present our work towards the development of a copy proof and machine readable hologram with an opticallyencoded security feature.