Abstract
This chapter aims at describing the advances in security devices despite that it may seem counterproductive in an anticounterfeiting context. After a brief overview of the importance of optical security devices in today's technology-driven world we provide a historical overview of their evolution. Even if a vast literature exists on the subject, it is not our goal to be exhaustive; we rather present the basic principles behind interference-based security devices and underline the various possibilities they offer. In particular, we describe recently added features which increase simplicity of use and enhance efficiency of interference-based security devices (ISDs): these include metamerism, magnetic materials, diffraction and interference combination, and use of plasmonic resonance, photonic color technology, and active materials.
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